-40%

DESKTOP CUSTOM GAMING SYSTEM MM5.15.851 Intel i9-9900k 3.6GHz 32GB RAM

$ 765.6

Availability: 66 in stock
  • Brand: Custom, Whitebox
  • Hard Drive Capacity: not included
  • RAM Size: 32 GB
  • Processor Speed: 3.60 GHz
  • Item must be returned within: 30 Days
  • All returns accepted: Returns Accepted
  • Storage Type: SSD (Solid State Drive)
  • Manufacturer Warranty: 3 years
  • Optical Drive: not included
  • Restocking Fee: No
  • Type: Desktop
  • Processor Configuration: 8-Core
  • Model: MM5.15.851
  • MPN: MM5.15.851
  • Refund will be given as: Money Back
  • Maximum RAM Capacity: 64 GB
  • Condition: New
  • SSD Capacity: 500GB
  • Operating System: Windows 10
  • Return shipping will be paid by: Buyer
  • Motherboard Model: MSI H310M PRO-VH
  • Features: Built-in Wi-Fi Adapter
  • Processor: Intel Core i9 9th Gen.

    Description

    Document
    Life time toll free support
    30 day money back guarantee
    Free shipping
    Product
    *
    Monitor sold separately
    Custom System Configuration
    Cases
    Antec NX Series NX310 RGB, Tempered Glass & front USB 3.0 (no DVD bay)
    Case Fans
    Dual Case Fans 120 mm Extra Quiet DC fan (two fans)
    Intel 8th & 9th Gen CPUs
    Intel Core i9-9900K Coffee Lake 3.6GHz (5.0GHz turbo) 8-Core
    Intel i3/i5/ i7 CPU Fans
    Thermaltake TH120 ARGB, extra quiet Liquid Cooling System
    Intel 8th & 9th Gen Motherboards
    MSI H310M PRO-VH, Onboard Video HDMI, GB LAN, DDR4, USB 3.0
    DDR4 System memory
    32GB (2x16GB) PC4-24000 DDR4 3000MHz Dual Channel
    PCI-Express Video cards
    nVidia Quadro P400 2GB, PCI Express 3.0 Workstation Video Card up to 3 monitors
    m.2 SSD drives
    512GB m.2 Solid State Drive, SATA3 , 550MB/s
    Sound Cards
    Realtek HD digital audio (onboard)
    Network & WiFi adapters
    Wireless 802.11AC 1200MBs + Bluetooth 4.0 combo Network Card PCI Express
    Power Supply
    400W ATX Power Supply
    Operating Systems
    Microsoft Windows 10 Home 64-Bit Edition (configured w/drivers and updates)
    50
    *
    This is custom PC configuration build using our system configurator tool. To insure order accuracy please review system configuration before ordering.
    System Configurator
    More info
    Cases
    Antec NX Series NX310 RGB, Tempered Glass & front USB 3.0 (no DVD bay)
    Model
    Brand
    Antec
    Series
    NX Series
    Model
    NX310
    Details
    Type
    ATX Mid Towe
    Color
    Black
    Case Material
    Steel / Plastic / Tempered Glass
    With Power Supply
    No
    Power Supply Mounted
    Bottom
    Motherboard Compatibility
    Micro ATX / ATX / ITX
    Side Panel Window
    Yes
    Removable Filter
    Yes
    Expansion
    Internal 3.5" Drive Bays
    2 x 3.5" / 2.5" (Convertible)
    Internal 2.5" Drive Bays
    4
    Expansion Slots
    7
    Front Panel Ports
    Front Ports
    2 x USB 2.0 / 1 x USB 3.0 / Audio / ARGB Control Button
    Cooling System
    Fan Options
    Front: 3 x 120mm (1 x 120mm ARGB LED Fan included) / 2 x 140mm fan
    Top: 2 x 120mm / 2 x 140mm fan
    Rear: 1 x 120mm fan (included)
    PSU Shroud: 2 x 120mm fan
    Radiator Options
    Front - Up to 280mm / Rear - Up to 120mm
    Dimensions & Weight
    Max GPU Length Allowance
    320 mm
    Max CPU Cooler Height Allowance
    165 mm
    Max PSU Length
    170 mm
    Dimensions (H x W x D)
    18.11" x 8.46" x 16.93"
    Weight
    11.24 lbs.
    Additional Information
    Date First Available
    September 24, 2019
    More info
    Case Fans
    Dual Case Fans 120 mm Extra Quiet DC fan (two fans)
    80 mm
    Brushless
    Cooling Fan for full/mid tower case
    The CoolFull 8cm x 8cm x 2.5cm (3 1/8" x 3 1/8" x 1") PC case fan is an add-in cooling fan designed to fit most computers. It can be used to circulate cool air into the case or exhaust warm air out, preventing problems due to overheating components. A quiet running brushless DC motor coupled with a high efficiency blade design is capable of moving 32 CFM (cubic feet per minute) of air. Power is supplied to the fan using a power tap that is connected the fan power connector on a PC's mother board.
    Power:
    12V/0.14A 2.0W
    Speed:
    3000RPM
    Productivity: 32 CFM
    Technology:
    Brushless
    More info
    Intel 8th & 9th Gen CPUs
    Intel Core i9-9900K Coffee Lake 3.6GHz (5.0GHz turbo) 8-Core
    Model
    Brand
    Intel
    Processors Type
    Desktop
    Series
    Core i9 9th Gen
    Name
    Intel Core i9-9900K
    Model
    BX80684I99900K
    Details
    CPU Socket Type
    LGA 1151 (300 Series)
    Core Name
    Coffee Lake
    # of Cores
    8-Core
    # of Threads
    16
    Operating Frequency
    3.6 GHz
    Max Turbo Frequency
    5.0 GHz
    L3 Cache
    16MB
    Manufacturing Tech
    14nm
    64-Bit Support
    Yes
    Hyper-Threading Support
    Yes
    Memory Types
    DDR4
    Memory Channel
    2
    Virtualization Technology Support
    Yes
    Integrated Graphics
    Intel HD Graphics 630
    Graphics Base Frequency
    350 MHz
    Graphics Max Dynamic Frequency
    1.2 GHz
    PCI Express Revision
    3.0
    Max Number of PCI Express Lanes
    16
    Thermal Design Power
    95W
    Cooling Device
    Cooling device not included - Processor Only
    Group
    Cooling Devices
    No Stock Coole
    More info
    Intel i3/i5/ i7 CPU Fans
    Thermaltake TH120 ARGB, extra quiet Liquid Cooling System
    Model
    Brand
    Thermaltake
    Series
    Water 3.0 120 ARGB Sync Edition
    Model
    CL-W232-PL12SW-B
    Type
    Liquid Cooling System
    Block
    Block Compatibility
    LGA 2066 / 2011-3 / 2011 / 1366 / 1200 / 1156 / 1155 / 1151 / 1150
    AMD AM4 / AM3+ / AM3 / AM2+ / AM2 / FM2 / FM1
    Block Material
    Coppe
    Radiator
    Radiator Dim.
    151.00 x 120.00 x 27.00 mm
    Fan
    Fan Size
    1 Fan Slot (120mm)
    Fan Dim.
    120.00 x 120.00 x 25.00 mm
    Fan RPM
    500 - 1500 R.P.M
    Fan Air Flow
    56.45 CFM
    Fan Noise
    25.8 dB-A
    LED Color
    RGB
    Tube
    Tube Dim.
    326mm
    Tube Material
    Rubbe
    Features
    Features
    Water 3.0 120 ARGB Sync Edition
    Tt LCS Certified
    Pure 12 ARGB Sync Radiator Fan
    Sync with Motherboard RGB Software
    Switch LED Modes with ARGB Controller
    High Efficiency Radiator
    High Performance Waterblock
    High Quality Pump
    Easy Installation
    Additional Information
    Date First Available
    May 07, 2020
    More info
    Intel 8th & 9th Gen Motherboards
    MSI H310M PRO-VH, Onboard Video HDMI, GB LAN, DDR4, USB 3.0
    Model
    Brand
    MSI
    Model
    H310M PRO-VH
    Supported CPU
    CPU Socket Type
    LGA 1151 (300 Series)
    CPU Type
    8th Generation Intel Core Processors
    * Not backward compatible with older generation of LGA 1151 CPUs
    Chipsets
    Chipset
    Intel H310
    Onboard Video
    Onboard Video Chipset
    Supported only by CPU with integrated graphic
    Memory
    Number of Memory Slots
    2~288pin
    Maximum Memory Supported
    32GB
    Channel Supported
    Dual Channel
    Storage Devices
    SATA 6Gb/s
    4 x SATA 6Gb/s
    Onboard Audio
    Audio Chipset
    Realtek ALC887
    Audio Channels
    8 Channels
    Onboard LAN
    LAN Chipset
    Realtek RTL8111H
    Max LAN Speed
    10/100/1000Mbps
    Rear Panel Ports
    Video Ports
    D-Su
    HDMI
    1 x HDMI
    Physical Spec
    Form Factor
    Micro ATX
    More info
    DDR4 System memory
    32GB (2x16GB) PC4-24000 DDR4 3000MHz Dual Channel
    Model
    Brand
    n/a
    Series
    DDR4 hihg Speed
    Model
    CT2A3000C16
    Details
    Capacity
    32GB (2 x 16GB)
    Type
    288-Pin DDR4 SDRAM
    Speed
    DDR4 3000 (PC4 24000)
    CAS Latency
    16
    Timing
    16-18-18-35
    Voltage
    1.2V
    ECC
    No
    Buffered/Registered
    Unbuffered
    Color
    Black
    Heat Spreader
    optional( not included)
    Features
    Designed for high-performance overclocking
    Each module with eight-layer PCB helps manage heat and provides superior overclocking headroom.
    Each IC is individually screened for performance potential.
    Designed for great looks
    Available in multiple colors to match your motherboard, your components, or just your style.
    Performance and Compatibility
    RAM is optimized and compatibility tested for the latest Intel and AMD Series motherboards and offers higher frequencies, greater bandwidth, and lower power consumption.
    XMP 2.0 support for trouble-free automatic overclocking.
    Low-profile design
    The RAM module height is carefully designed to fit smaller spaces.
    Recommend Use
    High Performance or Gaming Memory
    Fan Included
    No
    More info
    PCI-Express Video cards
    nVidia Quadro P400 2GB, PCI Express 3.0 Workstation Video Card up to 3 monitors
    Model
    Brand
    n/a
    Model
    Quadro p400
    Interface
    Interface
    PCI Express 3.0 x16
    Chipset
    Chipset Manufacturer
    NVIDIA
    GPU
    Quadro P400
    CUDA Cores
    256
    Memory
    Memory Size
    2GB
    Memory Interface
    64-bit
    Memory Type
    GDDR5
    3D API
    DirectX
    DirectX 12
    OpenGL
    OpenGL 4.5
    Ports
    DisplayPort
    3 x Mini-DisplayPort 1.4
    Details
    Digital Resolution
    5120 x 2880 x24 bpp at 60hz
    (7680 x 4320 x24 bpp at 60hz)
    Cooler
    Single
    Virtual Reality Ready
    Yes
    HDCP Ready
    Yes
    Operating Systems Supported
    Microsoft Windows 10 (64- and 32-bit)
    Microsoft Windows 8.1 and 8 (64- and 32-bit)
    Microsoft Windows 7 (64- and 32-bit)
    Microsoft Windows Server 2008 (64- and 32-bit)
    Microsoft Windows Server 2012
    Microsoft Windows Server 2012 R2 64
    Microsoft Windows Server 2016
    Linux - Full OpenGL implementation, complete with NVIDIA and ARB extensions (64- and 32-bit)
    System Requirements
    Max Power Consumption: 30W
    MINIMUM SYSTEM HARDWARE REQUIREMENTS:
    Intel Core i5, i7, Xeon or later
    AMD Phenom or Opteron-class or later
    PCIe x16 Gen 3 (preferred) expansion slot
    2GB or more of system memory, 8GB recommended
    200MB of available disk space for full driver installation
    Blu-ray or DVD-ROM drive
    Internet connection (if preferred for driver installation)
    DisplayPort (preferred) or DVI compatible displays
    HDMI display(s) with purchase of optional DP to HDMI adapter(s)
    Features
    Features
    GPU PERFORMANCE FEATURES:
    - Pascal GPU Technology
    - Frame Buffer and Memory Bandwidth
    - Pascal Dynamic Load Balancing
    - H.264 and HEVC Encode/Decode Engines
    - NVIDIA GPU Boost 3.0
    IMAGE QUALITY FEATURES:
    - Full-Scene Antialiasing (FSAA)
    - 16K Texture and Render Processing
    - Pascal Memory Compression
    DISPLAY FEATURES:
    - NVIDIA Quadro MOSAIC Technology
    - DisplayPort 1.4
    - HDR Ready
    - NVIDIA NVIEW Advanced Desktop Software
    - NVIDIA Quadro View
    - NVIDIA Quadro Experience
    - OpenGL Quad Buffered Stereo Support
    SOFTWARE SUPPORT:
    - NVIDIA CUDA Parallel Computing Platform
    - NVIDIA Enterprise-Management Tools
    - NVIDIA Multi-GPU Technology
    Form Factor & Dimensions
    Form Factor
    Low Profile
    Dimensions (L x H)
    5.70" x 2.71"
    Low Profile Bracket Included
    Yes
    Slot Width
    Single Slot
    Packaging
    Package Contents
    NVIDIA Quadro P400 professional graphics boards with attached full-height (ATX) bracket
    Unattached low-profile (SFF) bracket
    Three mDP to DP adapters
    Printed Quick Start Guide
    Printed Support Guide
    Additional Information
    Date First Available
    September 25, 2020
    TV Tuner & Capture cards
    NONE SELECTED
    More info
    m.2 SSD drives
    512GB m.2 Solid State Drive, SATA3 , 550MB/s
    Model
    Brand
    Team Group
    Model
    TM8PS5512GMC101
    Device Type
    Internal Solid State Drive (SSD)
    Details
    Form Factor
    M.2
    Capacity
    500GB
    Interface
    SATA III
    Performance
    Max Sequential Read
    Up to 530 MBps
    Max Sequential Write
    Up to 300 MBps
    4KB Random Read
    Up to 35,000 IOPS
    4KB Random Write
    Up to 70,000 IOPS
    MTBF
    1,500,000 hours
    Features
    Features
    Mainstream M.2 interface
    Supports Intel's SRT
    Supports S.M.A.R.T.
    Supports TRIM
    Environmental
    Operating Temperature
    0°C ~ +70°C
    Max Shock Resistance
    500G, 2m/s
    Max Vibration Resistance
    20G
    Dimensions & Weight
    Height
    3.50mm
    Width
    22.00mm
    Depth
    80.00mm
    Weight
    0.32 oz.
    Hard Drives & SSDs
    NONE SELECTED
    Hard Drive Fans
    NONE SELECTED
    Hard Drives & SSDs
    NONE SELECTED
    Hard Drive Fans
    2nd Hard drive Fan NONE SELECTED
    Optical Drives
    NONE SELECTED
    Media Card Readers
    NONE SELECTED
    More info
    Sound Cards
    Realtek HD digital audio (onboard)
    Enjoy high-end sound system on your PC!
    The onboard  HD audio (High Definition Audio, previously codenamed Azalia) CODEC enables high-quality 192KHz/24-bit audio output, jack-sensing feature, retasking functions and multi-streaming technology that simultaneously sends different audio streams to different destinations. You can now talk to your partners on the headphone while playing a multi-channel network games. All of these are done on one computer
    High Definition Audio CODEC
    Supports Jack-detect and Multistreaming teconologies
    Supports frount audio out interface
    Line in, line out, mic in.
    sound blaster compatible
    More info
    Network & WiFi adapters
    Wireless 802.11AC 1200MBs + Bluetooth 4.0 combo Network Card PCI Express
    Model
    Brand
    ASUS
    Model
    PCE-AC55BT B1
    Details
    Standards
    IEEE 802.11ac, IEEE 802.11a/b/g/n
    Wireless Data Rates
    Up to 1.2Gbps
    Security
    64-bit WEP, 128-bit WEP, WPA2-PSK, WPA-PSK
    Interface
    PCI Express
    Frequency Band
    2.4 GHz / 5 GHz
    System Requirements
    Windows 10
    Windows 8.1
    Windows 7
    Linux
    Feature
    Features
    AC1200 High-speed wireless internet connectivity
    Wireless-AC dual-band for low latency streaming and high performance online gaming
    Bluetooth 4.0 and BLE connectivity
    External antenna base for optimum signal reception
    Dimensions & Weight
    Weight
    0.11 lb.
    Packaging
    Package Contents
    Low Profile Bracket
    Support CD
    Warranty card
    Wireless LAN Adapte
    Controller Cards
    NONE SELECTED
    More info
    Power Supply
    400W ATX Power Supply
    Model
    Model
    Compatible with ATX 12V 2.3/EPS 12V, 115/230V AC input technology
    Series
    400-Watt ATX Computer Power Supply Desktop PC
    Details
    Maximum Power
    400W
    Fans
    1
    Efficiency
    > 70%
    Over Voltage Protection
    Yes
    Overload Protection
    Yes
    Input Voltage
    115 / 230 V
    Input Frequency Range
    50/60 Hz
    Output
    +3.3V 16A, +5V 18A, +12V 22A, -12V 0.5A, +5VSB 2A
    MTBF
    >100,000 Hours
    Dimensions
    5.9 W x 3.4 H x 5.5 D Inch fit ATX / PS2 form factor casing.
    Size/Dimensions
    5.9 W x 3.4 H x 5.5 D Inch fit ATX / PS2 form factor casing.
    Fans
    Fans Total Quantity
    1
    Top Fans Size
    80mm
    Top Fans Bearing Type
    Ball
    Dimensions & Weight
    Dimensions
    5.9 W x 3.4 H x 5.5 D Inch fit ATX / PS2 form factor casing.
    Keyboards
    NONE SELECTED
    Mice
    NONE SELECTED
    Speakers
    NONE SELECTED
    More info
    Operating Systems
    Microsoft Windows 10 Home 64-Bit Edition (configured w/drivers and updates)
    Disclaimer
    Disclaimer
    Use of this OEM System Builder Channel software is subject to the terms of the Microsoft OEM System Builder License. This software is intended for pre-installation on a new personal computer for resale. This OEM System Builder Channel software requires the assembler to provide end user support for the Windows software .
    Model
    Brand
    Microsoft
    Model
    KW9-00140
    Details
    Name
    Windows 10 Home - 64-bit
    Bit Version
    64-bit
    Version
    Home
    System Requirements
    1 GHz processor or faster
    1 GB RAM for 32-bit; 2 GB for 64-bit
    Up to 20 GB available hard disk space
    800 x 600 screen resolution or higher
    DirectX 9 graphics processor with WDDM driver
    Internet access (fees may apply)
    Microsoft account required for some features
    Watching DVDs requires separate playback software
    Packaging
    OEM
    Features
    Feature
    The Windows you know, only better
    Windows 10 feels familiar so you can get more done from the get-go. The Start menu is back with space to pin your favorite apps. And simple navigation means you don't need to spend much time learning anything new.
    Always up-to-date
    You won't have to wonder if you have the latest features or security updates. Windows automatically delivers updates, when they're ready, directly to your device.
    Cortana's got your back
    Cortana is your truly personal digital assistant who works across all your devices to help get things done.
    Rule the web
    Microsoft Edge is an all-new browser built to deliver a better web experience. You can write directly on webpages from your PC, read articles distraction-free, and save your favorites to read offline later.
    Take your gaming further
    With Xbox on Windows, play and connect with your games and friends. Everywhere.
    Universal Apps, including Office
    The Store in Windows 10 is a one-stop shop for hundreds of thousands of apps including games, music, videos, as well as a new version of Office.
    Plug Standards
    Electrical Outlet Plug Type
    Software and Video Games
    Office Software
    NONE SELECTED
    Monitors
    NONE SELECTED
    Payment
    Payment Options
    Payment must be made within 7 days after the auction end. OH residents must add 7.75% sales tax.
    Winning bidder agrees to prepay for PC System after completion of auction.
    We accept:
    Visa/Master card, Discover, American Express, Paypal.
    We don't offer escrow or COD payment. Please be sure to include all necessary information to complete your order.
    Shipping
    Packing and Shipping
    Free packing, insurance and shipping by FedEX or UPS Ground Service to the 48 Continental United States. If you prefer one shipping carrier over another please let us know at the time of your order.
    Shipping to Alaska, Hawaii, Virgin Islands and Puerto Rico by USPS priority .
    Shipping to APO or PO BOX by USPS Priority . (UPS shipping is not available for APO/FPO or PO BOX addresses). We do not ship internationally.
    Note: Some of the custom configurations have to be shipped in two or more boxes. Additional shipping charge may be added if monitor or large speakers were selected.
    For shipping quote VIA UPS to Alaska, Hawaii and Puerto Rico please email or call.
    Warranty
    3-Year Limited Warranty
    For Systems
    3-year warranty on system components from original invoice date (system components is defined as all major component inside the case). We will replace or repair any system component for a period of 3 year from the invoice date. If a replacement component is no longer available or is discontinued, we reserves the right to substitute the component for an equivalent part, or offer an upgrade option.
    You will receive an official company invoice with a company phone number and warranty information.
    Should any problem arise, you may contact us by e-mail or by phone. If a return is required, it will be promptly authorized and you may return the system or the affected part for replacement.
    Support
    Life Time Technical Support Warranty
    For Systems
    Any customer who purchases a system from us is entitled to free technical support for as long as they own the system. To obtain technical support services or to invoke warranted privileges, customers should contact our Technical Support Department.
    Contacts
    Contact Us
    Dear customers. Because of new eBay seller contact information policy we unable to show our phone or mailing information on eBay page anymore. If you need to contact us please use “Ask a question” link at the very bottom of this page. Once you purchase the item you will receive email with our email address, phone and mailing address info. Each purchased item will be accompanied with our official company invoice with our toll free phone number and warranty information
    Paypal Verified Seller!
    FAQ
    FAQ
    General Questions
    Do your systems come assembled or do I need to put it together?
    All system components listed on your order will be assembled and tested before shipping. We also do BIOS update to insure all component with latest BIOS version.
    If I do not order some key component like RAM or HDD, will my system be tested?
    Yes, if some key component are not select we add our test component to make system operational. After system passes our testing we would remove test component prior to shipping.
    Will I receive manuals and drivers for system component?
    Yes we include all corresponding manuals and driver CD for all system components. Please note some drivers or manuals are only available VIA download.
    If I buy operating system, will it be installed or do I have to install it myself?
    When you order OS with a system we install it with latest updates and all necessary drivers. Customers who order OS with a system receive full version OS disk and Microsoft COA (certificate of authenticity) product key.
    I'm not sure what works together. Can you help?
    Absolutely! Our configurators are updated consistently to ensure every part listed is compatible for that build. Even with that in place, we still verify each order after it's been placed. If you'd like some advice on choosing your specifications, call or use ask seller question button to tell us what you'll be using the computer for, and we will provide you with our recommendations.
    Looking to add a part we don't have listed?
    All of our custom configurators are updated on a constant basis to provide as many compatible options as possible. If you don't see a part listed that you'd like to add to your new computer call or use ask seller question button to let us know .We'd be happy to research the compatibility and provide you a customized quote.
    Warranty & TechSupport Questions
    What do your warranties cover?
    Magic Micro complete systems are covered by a 1-year or 3-year limited warranty, depending on the product purchased. The limited warranty covers defects in components and workmanship in our custom built systems for the applicable limited warranty set forth in your packing slip or invoice.
    How do I get warranty service?
    Before the warranty expires, you must contact our Technical Support department. We will first attempt to troubleshoot the system to determine if any type of part replacement or repair is necessary. If the issue cannot be resolved through this method, Magic Micro will authorize that the system or component needs to be serviced.
    When can I get technical support?
    Our technicians are here to answer your questions from 10:00 am to 6:00 pm Eastern Time Mo-Fr by calling our toll free number and you're always welcome to use email question after business hours. Our technicians do their absolute best to make sure every message is responded to within a timely matter. Emails are checked regularly even on weekends
    How long is technical support?
    Customers who purchased a custom built product from Magic Micro Computer are entitled to free technical hardware-related support for the lifetime of their product.
    Order processing & Shipping
    How long will it take for my order to ship?
    All our systems are built to order After payment is processed orders take approximately 2-3 business days order to be procured, assembled, tested, and then shipped. Estimated ship dates may vary depending on the product purchased.
    Do you require signatures on your shipments?
    Absolutely! All Magic Micro shipments are signature required, so please be sure there is someone available to sign for the package on the scheduled delivery date.
    What if I'm not available to sign for my shipment?
    If you're not at the delivery location when the package arrives, you can reschedule the delivery, or have it held at a local pick up station.
    Do you offer faster order processing and shipping option?
    Yes we do have option for 1-2 day order processing and faster shipping. Please contact us via message system or call for express order processing and shipping upgrades ()