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GeForce 8600 GT 512MB DDR2 vs Radeon HD 4890 1GB

Intro

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

Compare those specs to the Radeon HD 4890 1GB, which features a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 975 MHz through a 256-bit bus. It also is comprised of 800(160x5) Stream Processors, 40 Texture Address Units, 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 1GB 190 Watts
Difference: 143 Watts (304%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4890 1GB should be 875% quicker than the GeForce 8600 GT 512MB DDR2 in general, because of its higher bandwidth. (explain)

Radeon HD 4890 1GB 124800 MB/sec
GeForce 8600 GT 512MB DDR2 12800 MB/sec
Difference: 112000 (875%)

Texel Rate

The Radeon HD 4890 1GB will be a lot (more or less 363%) more effective at AF than the GeForce 8600 GT 512MB DDR2. (explain)

Radeon HD 4890 1GB 40000 Mtexels/sec
GeForce 8600 GT 512MB DDR2 8640 Mtexels/sec
Difference: 31360 (363%)

Pixel Rate

The Radeon HD 4890 1GB is much (about 270%) better at anti-aliasing than the GeForce 8600 GT 512MB DDR2, and also able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 4890 1GB 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 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 4890 1GB
Manufacturer nVidia AMD
Year April 2007 Apr 2, 2009
Code Name G84 RV790 XT
Memory 512 MB 1024 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 (measured in megabytes per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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GeForce 8600 GT 512MB DDR2

Amazon.com

Check prices at:

Radeon HD 4890 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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