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GeForce 8600 GT 512MB DDR2 vs Radeon HD 4870 1GB

Intro

The GeForce 8600 GT 512MB DDR2 has a core clock frequency of 540 MHz and a DDR2 memory speed of 400 MHz. It also makes use of a 128-bit bus, and makes use of a 80 nm design. It features 32 SPUs, 16 Texture Address Units, and 8 ROPs.

Compare all of that to the Radeon HD 4870 1GB, which features a GPU core clock speed of 750 MHz, and 1024 MB of GDDR5 RAM running at 900 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 40 TAUs, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 512MB DDR2 47 Watts
Radeon HD 4870 1GB 150 Watts
Difference: 103 Watts (219%)

Memory Bandwidth

The Radeon HD 4870 1GB should theoretically be much faster than the GeForce 8600 GT 512MB DDR2 overall. (explain)

Radeon HD 4870 1GB 115200 MB/sec
GeForce 8600 GT 512MB DDR2 12800 MB/sec
Difference: 102400 (800%)

Texel Rate

The Radeon HD 4870 1GB will be a lot (more or less 247%) more effective at anisotropic filtering than the GeForce 8600 GT 512MB DDR2. (explain)

Radeon HD 4870 1GB 30000 Mtexels/sec
GeForce 8600 GT 512MB DDR2 8640 Mtexels/sec
Difference: 21360 (247%)

Pixel Rate

The Radeon HD 4870 1GB should be quite a bit (more or less 178%) better at AA than the GeForce 8600 GT 512MB DDR2, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 4870 1GB 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 1GB

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 1GB
Manufacturer nVidia AMD
Year April 2007 Jun 25, 2008
Code Name G84 RV770 XT
Memory 512 MB 1024 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: Memory bandwidth is the largest amount of data (measured in megabytes per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the graphics 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 most pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce 8600 GT 512MB DDR2

Amazon.com

Check prices at:

Radeon HD 4870 1GB

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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