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

Intro

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

Compare all of that to the Radeon HD 4870 512MB, which makes use of a 55 nm design. AMD has set the core frequency at 750 MHz. The GDDR5 RAM is set to run at a frequency of 900 MHz on this particular card. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically speaking, the Radeon HD 4870 512MB should be 800% faster than the GeForce 8600 GT 512MB DDR2 in general, due to its higher bandwidth. (explain)

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

Texel Rate

The Radeon HD 4870 512MB will be a lot (about 247%) better at texture filtering than the GeForce 8600 GT 512MB DDR2. (explain)

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

Pixel Rate

The Radeon HD 4870 512MB should be quite a bit (approximately 178%) faster with regards to AA than the GeForce 8600 GT 512MB DDR2, and will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 4870 512MB 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 512MB

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 512MB
Manufacturer nVidia AMD
Year April 2007 Jun 25, 2008
Code Name G84 RV770 XT
Memory 512 MB 512 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 information (in units of megabytes per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, 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 amount of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better 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 maximum number of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core 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 many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

GeForce 8600 GT 512MB DDR2

Amazon.com

Check prices at:

Radeon HD 4870 512MB

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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