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GeForce 8600 GT 512MB GDDR3 vs Radeon HD 6870

Intro

The GeForce 8600 GT 512MB GDDR3 has clock speeds of 540 MHz on the GPU, and 700 MHz on the 512 MB of GDDR3 RAM. It features 32 SPUs along with 16 TAUs and 8 ROPs.

Compare those specs to the Radeon HD 6870, which comes with GPU clock speed of 900 MHz, and 1024 MB of GDDR5 memory set to run at 1050 MHz through a 256-bit bus. It also features 1120 SPUs, 56 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 512MB GDDR3 47 Watts
Radeon HD 6870 151 Watts
Difference: 104 Watts (221%)

Memory Bandwidth

Performance-wise, the Radeon HD 6870 should theoretically be a lot better than the GeForce 8600 GT 512MB GDDR3 overall. (explain)

Radeon HD 6870 134400 MB/sec
GeForce 8600 GT 512MB GDDR3 22400 MB/sec
Difference: 112000 (500%)

Texel Rate

The Radeon HD 6870 will be a lot (about 483%) faster with regards to texture filtering than the GeForce 8600 GT 512MB GDDR3. (explain)

Radeon HD 6870 50400 Mtexels/sec
GeForce 8600 GT 512MB GDDR3 8640 Mtexels/sec
Difference: 41760 (483%)

Pixel Rate

The Radeon HD 6870 will be a lot (more or less 567%) more effective at full screen anti-aliasing than the GeForce 8600 GT 512MB GDDR3, and also will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 6870 28800 Mpixels/sec
GeForce 8600 GT 512MB GDDR3 4320 Mpixels/sec
Difference: 24480 (567%)

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.

Price Comparison

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GeForce 8600 GT 512MB GDDR3

Amazon.com

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Radeon HD 6870

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 GDDR3 Radeon HD 6870
Manufacturer nVidia AMD
Year April 2007 October 2010
Code Name G84 Barts XT
Memory 512 MB 1024 MB
Core Speed 540 MHz 900 MHz
Memory Speed 1400 MHz 4200 MHz
Power (Max TDP) 47 watts 151 watts
Bandwidth 22400 MB/sec 134400 MB/sec
Texel Rate 8640 Mtexels/sec 50400 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 28800 Mpixels/sec
Unified Shaders 32 1120
Texture Mapping Units 16 56
Render Output Units 8 32
Bus Type GDDR3 GDDR5
Bus Width 128-bit 256-bit
Fab Process 80 nm 40 nm
Transistors 289 million 1700 million
Bus PCIe x16 PCIe x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported over the external memory interface in one second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, 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 calculated by multiplying the total number of texture units of the card by the core 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in one 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 - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce 8600 GT 512MB GDDR3

Amazon.com

Check prices at:

Radeon HD 6870

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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