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GeForce 8600 GT 512MB DDR2 vs Radeon HD 4890 2GB

Intro

The GeForce 8600 GT 512MB DDR2 makes use of a 80 nm design. nVidia has set the core speed at 540 MHz. The DDR2 RAM works at a speed of 400 MHz on this particular model. It features 32 SPUs along with 16 Texture Address Units and 8 ROPs.

Compare all of that to the Radeon HD 4890 2GB, which comes with core clock speeds of 1000 MHz on the GPU, and 975 MHz on the 2048 MB of GDDR5 RAM. It features 800(160x5) SPUs along with 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 4890 2GB 190 Watts
Difference: 143 Watts (304%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4890 2GB should theoretically be much superior to the GeForce 8600 GT 512MB DDR2 in general. (explain)

Radeon HD 4890 2GB 124800 MB/sec
GeForce 8600 GT 512MB DDR2 12800 MB/sec
Difference: 112000 (875%)

Texel Rate

The Radeon HD 4890 2GB should be a lot (more or less 363%) better at anisotropic filtering than the GeForce 8600 GT 512MB DDR2. (explain)

Radeon HD 4890 2GB 40000 Mtexels/sec
GeForce 8600 GT 512MB DDR2 8640 Mtexels/sec
Difference: 31360 (363%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4890 2GB is a better choice, and very much so. (explain)

Radeon HD 4890 2GB 16000 Mpixels/sec
GeForce 8600 GT 512MB DDR2 4320 Mpixels/sec
Difference: 11680 (270%)

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 4890 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 4890 2GB
Manufacturer nVidia AMD
Year April 2007 Apr 2, 2009
Code Name G84 RV790 XT
Memory 512 MB 2048 MB
Core Speed 540 MHz 1000 MHz
Memory Speed 800 MHz 3900 MHz
Power (Max TDP) 47 watts 190 watts
Bandwidth 12800 MB/sec 124800 MB/sec
Texel Rate 8640 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 16000 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 959 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 megabytes per second) that can be moved over the external memory interface in one 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 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better 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 a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce 8600 GT 512MB DDR2

Amazon.com

Check prices at:

Radeon HD 4890 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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