GeForce GTX 285 1GB vs Radeon HD 6990

Intro

The GeForce GTX 285 1GB comes with core clock speeds of 648 MHz on the GPU, and 1242 MHz on the 1024 MB of GDDR3 RAM. It features 240 SPUs along with 80 Texture Address Units and 32 Rasterization Operator Units.

Compare that to the Radeon HD 6990, which makes use of a 40 nm design. ATi has clocked the core speed at 830 MHz. The GDDR5 memory runs at a speed of 1250 MHz on this particular model. It features 1536 SPUs as well as 96 Texture Address Units and 32 Rasterization Operator Units.

Price Comparison

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

GeForce GTX 285 1GB Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Radeon HD 6990 Amazon.com Other US-based stores Amazon.co.uk Amazon.de Amazon.fr

Specifications

Model	GeForce GTX 285 1GB	Radeon HD 6990
Manufacturer	nVidia	ATi
Year	January 15, 2009	March 2011
Code Name	G200b	Antilles
Fab Process	55 nm	40 nm
Bus	PCIe x16 2.0	PCIe 2.1 x16
Memory	1024 MB	2048 MB (x2)
Core Speed	648 MHz	830 MHz (x2)
Shader Speed	1476 MHz	(N/A) MHz (x2)
Memory Speed	1242 MHz	1250 MHz (x2)
Unified Shaders	240	1536 (x2)
Texture Mapping Units	80	96 (x2)
Render Output Units	32	32 (x2)
Bus Type	GDDR3	GDDR5
Bus Width	512-bit	256-bit (x2)
DirectX Version	DirectX 10	DirectX 11
OpenGL Version	OpenGL 3.1	OpenGL 4.1
Power (Max TDP)	204 watts	375 watts
Shader Model	4.0	5.0
Bandwidth	158976 MB/sec	320000 MB/sec
Texel Rate	51840 Mtexels/sec	159360 Mtexels/sec
Pixel Rate	20736 Mpixels/sec	53120 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.