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GeForce 8600 GTS vs Radeon HD 6790

Intro

The GeForce 8600 GTS uses a 80 nm design. nVidia has set the core frequency at 675 MHz. The GDDR3 memory works at a frequency of 1000 MHz on this particular card. It features 32 SPUs as well as 16 Texture Address Units and 8 Rasterization Operator Units.

Compare all that to the Radeon HD 6790, which has clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs as well as 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8600 GTS 75 Watts
Radeon HD 6790 150 Watts
Difference: 75 Watts (100%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6790 should perform much faster than the GeForce 8600 GTS overall. (explain)

Radeon HD 6790 134400 MB/sec
GeForce 8600 GTS 32000 MB/sec
Difference: 102400 (320%)

Texel Rate

The Radeon HD 6790 will be much (approximately 211%) more effective at anisotropic filtering than the GeForce 8600 GTS. (explain)

Radeon HD 6790 33600 Mtexels/sec
GeForce 8600 GTS 10800 Mtexels/sec
Difference: 22800 (211%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6790 is the winner, and very much so. (explain)

Radeon HD 6790 13440 Mpixels/sec
GeForce 8600 GTS 5400 Mpixels/sec
Difference: 8040 (149%)

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 GTS

Amazon.com

Check prices at:

Radeon HD 6790

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 GTS Radeon HD 6790
Manufacturer nVidia AMD
Year April 2007 April 2011
Code Name G84 Barts LE
Memory 512 MB 1024 MB
Core Speed 675 MHz 840 MHz
Memory Speed 2000 MHz 4200 MHz
Power (Max TDP) 75 watts 150 watts
Bandwidth 32000 MB/sec 134400 MB/sec
Texel Rate 10800 Mtexels/sec 33600 Mtexels/sec
Pixel Rate 5400 Mpixels/sec 13440 Mpixels/sec
Unified Shaders 32 800
Texture Mapping Units 16 40
Render Output Units 8 16
Bus Type GDDR3 GDDR5
Bus Width 128-bit 256-bit
Fab Process 80 nm 40 nm
Transistors 289 million 1700 million
Bus PCIe x16 PCIe 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the maximum amount of information (measured in megabytes per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 number of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, the better the video 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 the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce 8600 GTS

Amazon.com

Check prices at:

Radeon HD 6790

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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