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GeForce 8600 GT 512MB DDR2 vs Radeon HD 6990

Intro

The GeForce 8600 GT 512MB DDR2 has core clock speeds of 540 MHz on the GPU, and 400 MHz on the 512 MB of DDR2 memory. It features 32 SPUs as well as 16 Texture Address Units and 8 ROPs.

Compare those specs to the Radeon HD 6990, which comes with clock speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 memory. It features 1536 SPUs as well as 96 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 512MB DDR2 47 Watts
Radeon HD 6990 375 Watts
Difference: 328 Watts (698%)

Memory Bandwidth

Theoretically, the Radeon HD 6990 should perform much faster than the GeForce 8600 GT 512MB DDR2 overall. (explain)

Radeon HD 6990 320000 MB/sec
GeForce 8600 GT 512MB DDR2 12800 MB/sec
Difference: 307200 (2400%)

Texel Rate

The Radeon HD 6990 should be a lot (more or less 1744%) faster with regards to texture filtering than the GeForce 8600 GT 512MB DDR2. (explain)

Radeon HD 6990 159360 Mtexels/sec
GeForce 8600 GT 512MB DDR2 8640 Mtexels/sec
Difference: 150720 (1744%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon HD 6990 is superior to the GeForce 8600 GT 512MB DDR2, by a large margin. (explain)

Radeon HD 6990 53120 Mpixels/sec
GeForce 8600 GT 512MB DDR2 4320 Mpixels/sec
Difference: 48800 (1130%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce 8600 GT 512MB DDR2

Amazon.com

Check prices at:

Radeon HD 6990

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model GeForce 8600 GT 512MB DDR2 Radeon HD 6990
Manufacturer nVidia AMD
Year April 2007 March 2011
Code Name G84 Antilles
Memory 512 MB 2048 MB (x2)
Core Speed 540 MHz 830 MHz (x2)
Memory Speed 800 MHz 5000 MHz (x2)
Power (Max TDP) 47 watts 375 watts
Bandwidth 12800 MB/sec 320000 MB/sec
Texel Rate 8640 Mtexels/sec 159360 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 53120 Mpixels/sec
Unified Shaders 32 1536 (x2)
Texture Mapping Units 16 96 (x2)
Render Output Units 8 32 (x2)
Bus Type DDR2 GDDR5
Bus Width 128-bit 256-bit (x2)
Fab Process 80 nm 40 nm
Transistors 289 million 2640 million
Bus PCIe x16 PCIe 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of data (counted in MB per second) that can be transported over the external memory interface within a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

GeForce 8600 GT 512MB DDR2

Amazon.com

Check prices at:

Radeon HD 6990

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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