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GeForce 8600 GT 1GB DDR2 vs Radeon HD 7990

Intro

The GeForce 8600 GT 1GB DDR2 has a GPU core speed of 540 MHz, and the 1024 MB of DDR2 memory is set to run at 400 MHz through a 128-bit bus. It also features 32 Stream Processors, 16 Texture Address Units, and 8 ROPs.

Compare all of that to the Radeon HD 7990, which comes with GPU clock speed of 950 MHz, and 3072 MB of GDDR5 memory running at 1500 MHz through a 384-bit bus. It also is comprised of 2048 SPUs, 128 TAUs, and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GT 1GB DDR2 47 Watts
Radeon HD 7990 375 Watts
Difference: 328 Watts (698%)

Memory Bandwidth

In theory, the Radeon HD 7990 should be quite a bit faster than the GeForce 8600 GT 1GB DDR2 in general. (explain)

Radeon HD 7990 576000 MB/sec
GeForce 8600 GT 1GB DDR2 12800 MB/sec
Difference: 563200 (4400%)

Texel Rate

The Radeon HD 7990 should be quite a bit (approximately 2715%) more effective at AF than the GeForce 8600 GT 1GB DDR2. (explain)

Radeon HD 7990 243200 Mtexels/sec
GeForce 8600 GT 1GB DDR2 8640 Mtexels/sec
Difference: 234560 (2715%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7990 is superior to the GeForce 8600 GT 1GB DDR2, by far. (explain)

Radeon HD 7990 60800 Mpixels/sec
GeForce 8600 GT 1GB DDR2 4320 Mpixels/sec
Difference: 56480 (1307%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce 8600 GT 1GB DDR2

Amazon.com

Check prices at:

Radeon HD 7990

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 1GB DDR2 Radeon HD 7990
Manufacturer nVidia AMD
Year April 2007 April 2013
Code Name G84 Malta
Memory 1024 MB 3072 MB (x2)
Core Speed 540 MHz 950 MHz (x2)
Memory Speed 800 MHz 6000 MHz (x2)
Power (Max TDP) 47 watts 375 watts
Bandwidth 12800 MB/sec 576000 MB/sec
Texel Rate 8640 Mtexels/sec 243200 Mtexels/sec
Pixel Rate 4320 Mpixels/sec 60800 Mpixels/sec
Unified Shaders 32 2048 (x2)
Texture Mapping Units 16 128 (x2)
Render Output Units 8 32 (x2)
Bus Type DDR2 GDDR5
Bus Width 128-bit 384-bit (x2)
Fab Process 80 nm 28 nm
Transistors 289 million 4313 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially 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 1GB DDR2

Amazon.com

Check prices at:

Radeon HD 7990

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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