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GeForce 8600 GT 512MB GDDR3 vs Radeon HD 6870

Intro

The GeForce 8600 GT 512MB GDDR3 comes with a core clock frequency of 540 MHz and a GDDR3 memory frequency of 700 MHz. It also uses a 128-bit bus, and uses a 80 nm design. It is made up of 32 SPUs, 16 TAUs, and 8 ROPs.

Compare those specifications to the Radeon HD 6870, which comes with a clock frequency of 900 MHz and a GDDR5 memory frequency of 1050 MHz. It also uses a 256-bit memory bus, and makes use of a 40 nm design. It is comprised of 1120 SPUs, 56 TAUs, and 32 ROPs.

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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

As far as performance goes, the Radeon HD 6870 should in theory be quite a bit better than the GeForce 8600 GT 512MB GDDR3 in general. (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 quite a bit (approximately 483%) better at 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

If running with a high screen resolution is important to you, then the Radeon HD 6870 is superior to the GeForce 8600 GT 512MB GDDR3, and very much so. (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

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.

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 data (measured in megabytes per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the interface width by its memory clock speed. If it uses DDR RAM, the result should 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total texture units of the card by the core clock 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 most pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core speed of the card. 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 rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max 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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