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Gigabyte GV-N285OC-2GI Geforce GTX 285 2GB Videocard Review
Gigabyte GV-N285OC-2GI Geforce GTX 285 2GB Videocard Review - PCSTATS
Everything you'd expect form a NVIDIA GT200b-based videocard is here: NVIDIA PhysX, CUDA, Hybridpower, 3-way SLI, Purevideo and Graphics Plus. Support for DirectX 10, OpenGL 2.1 are of course included as well, although NVIDIA has stated that it will be skipping DirectX 10.1 support altogether and instead go straight to DirectX 11.
 77% Rating:   
Filed under: Video Cards Published:  Author: 
External Mfg. Website: Gigabyte Sep 30 2009   J. Apong  
Home > Reviews > Video Cards > Gigabyte GV-N285OC-2GI

nVidia Geforce GTX 285 and the GT200 GPU

Nvidia's Geforce GTX 285 is based on the same NVIDIA GT200 GPU architecture that's inside the Geforce GTX 280, but with a few noticeable tweaks, overclocks and a die shrink that has caused NVIDIA to rename it the GT200b.

Given the size of the naked nVidia GT200b GPU, it's not so surprising that to hear it contains 240 stream processors and 1.4 Billion transistors. Thanks to a 55nm die-shrink NVIDIA is able to pack these transistors into a smaller package. While the die of the original NVIDIA GT200 was 576mm2, the GT200b has been brought down to approximately 425mm2. Still, nVidia is in desperate need of a 40nm, or 32nm die shrink.

Default clock speed of the Geforce GTX 285 is 648MHz, on the Gigabyte GV-N285OC-2GI it has been factory overclocked to 660MHz. GPU communicates over a 512-bit wide memory interface, and it basically offers the highest core, shader and memory clock speeds of any desktop NVIDIA graphics card.

NVIDIA's GT200b graphics processing unit is very much a match for ATI's R700 GPU. While the ATI videocards have more on-board stream processors and faster memory, the NVIDIA videocards compensate by having faster faster shader clocks and wider memory interfaces. The end result is a pair of GPUs that have very different architectures, but still manage to achieve very similar performance.

NVIDIA GT200 vs ATI R700 Videocards


Core clock

Stream processors/Clock

Memory Clock/Interface

Memory capacity Market
Radeon HD 4870X2 750MHz 1600/750MHz 3600MHz/256-bit 2048MB Flagship
Radeon HD 4890 850MHz 800/850MHz 3900MHz/256-bit 1024MB High-end
Radeon HD 4870 750MHz 800/750MHz 3600MHz/256-bit 1024MB Mainstream
Radeon HD 4850 625MHz 800/625MHz 1986MHz/256-bit 512MB Mainstream
Geforce GTX 295 576MHz 480/1242MHz 2000MHz/448-bit 1792MB Flagship
Gigabyte GV-N285OC-2GI 660MHz 240/1498Mhz 2400Mhz/512-bit 2048MHz Flagship
Geforce GTX 285 648MHz 240/1476MHz 2484MHz/512-bit 1024MB High-end
Geforce GTX 280 602MHz 240/1296MHz 2214MHz/512-bit 1024MB High-end
Geforce GTX 275 633MHz 240/1404MHz 2268MHz/448-bit 896MB Mainstream
Geforce GTX 260 576MHz 216/1350MHz 2000MHz/448-bit 896MB Mainstream

Of course, the Gigabyte GV-N285OC-2GI videocard that PCSTATS is looking at today has been substantially modified from the original Geforce GTX 285 reference design. Gigabyte has doubled the amount of available memory to a whopping 2048MB of GDDR3. There are a few benefits to having such a huge amount of on-board memory, most of which come when running games at very high resolutions (think 2560 x 1600) or span multiple monitors. The extra memory is also useful when it comes to turning on eye candy like 16xAA. While most users won't have any conventional use for this much video memory, this is far from a conventional videocard, and will likely be used in very exotic system configurations.

Gigabyte likely had to lower the memory speeds a little in order to keep this much memory stable, so the over all memory speed on the GV-N285OC-2GI has actually dropped to 2400MHz from the stock speed of 2484MHz. However to compensate for the speed difference the core clock of the GV-N285OC-2GI has been raised from 648MHz up to 660MHz.

As a high-end Geforce videocard, the Gigabyte GV-N285OC-2GI can be teamed up in both two-way and three-way SLI. While the GV-N285OC-2GI can be used in SLI with a standard 1GB Geforce GTX 285, it will only be able to access 1GB of its on-board video memory under those conditions.

With its massive, overclocked GPU and additional memory, it's likely the Gigabyte GV-N285OC-2GI won't be friendly to power supplies let's take a look at just how much juice this videocard needs.

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Contents of Article: Gigabyte GV-N285OC-2GI
 Pg 1.  Gigabyte GV-N285OC-2GI Geforce GTX 285 2GB Videocard Review
 Pg 2.  — nVidia Geforce GTX 285 and the GT200 GPU
 Pg 3.  Videocard Power Consumption Measurements
 Pg 4.  nVidia GTX285 Overclocking to 800MHz?
 Pg 5.  Videocard Benchmarks: 3DMark06
 Pg 6.  DX10 Videocard Benchmarks: 3DMark Vantage
 Pg 7.  DX10 Videocard Benchmarks: STALKER
 Pg 8.  DX10 Videocard Benchmarks: Crysis
 Pg 9.  DX10 Videocard Benchmarks: Call of Juarez
 Pg 10.  DX10 Videocard Benchmarks: Lost Planet
 Pg 11.  Videocard Benchmarks: FEAR
 Pg 12.  AA/AF Videocard Benchmarks: FarCry 2
 Pg 13.  AA/AF Videocard Benchmarks: Crysis
 Pg 14.  Gigabyte's 2GB GTX285 -You don't need this much power

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