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GeForce 8600 GT 512MB DDR2 vs Radeon HD 4870 2GB

Intro

The GeForce 8600 GT 512MB DDR2 comes with core 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 4870 2GB, which has GPU clock speed of 750 MHz, and 2048 MB of GDDR5 memory running at 900 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 512MB DDR2 47 Watts
Radeon HD 4870 2GB 150 Watts
Difference: 103 Watts (219%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 2GB should be a lot faster than the GeForce 8600 GT 512MB DDR2 in general. (explain)

Radeon HD 4870 2GB 115200 MB/sec
GeForce 8600 GT 512MB DDR2 12800 MB/sec
Difference: 102400 (800%)

Texel Rate

The Radeon HD 4870 2GB will be quite a bit (approximately 247%) better at texture filtering than the GeForce 8600 GT 512MB DDR2. (explain)

Radeon HD 4870 2GB 30000 Mtexels/sec
GeForce 8600 GT 512MB DDR2 8640 Mtexels/sec
Difference: 21360 (247%)

Pixel Rate

The Radeon HD 4870 2GB should be quite a bit (approximately 178%) more effective at AA than the GeForce 8600 GT 512MB DDR2, and will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 4870 2GB 12000 Mpixels/sec
GeForce 8600 GT 512MB DDR2 4320 Mpixels/sec
Difference: 7680 (178%)

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 DDR2

Amazon.com

Check prices at:

Radeon HD 4870 2GB

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 4870 2GB
Manufacturer nVidia AMD
Year April 2007 Jun 25, 2008
Code Name G84 RV770 XT
Memory 512 MB 2048 MB
Core Speed 540 MHz 750 MHz
Memory Speed 800 MHz 3600 MHz
Power (Max TDP) 47 watts 150 watts
Bandwidth 12800 MB/sec 115200 MB/sec
Texel Rate 8640 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 32 800(160x5)
Texture Mapping Units 16 40
Render Output Units 8 16
Bus Type DDR2 GDDR5
Bus Width 128-bit 256-bit
Fab Process 80 nm 55 nm
Transistors 289 million 956 million
Bus PCIe x16 PCIe 2.0 x16
DirectX Version DirectX 10 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of information (in units of MB per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 are applied per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce 8600 GT 512MB DDR2

Amazon.com

Check prices at:

Radeon HD 4870 2GB

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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