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GeForce 8800 GTX vs Radeon HD 4790

Intro

The GeForce 8800 GTX comes with a GPU clock speed of 575 MHz, and the 768 MB of GDDR3 RAM runs at 900 MHz through a 384-bit bus. It also features 128 SPUs, 64 Texture Address Units, and 24 Raster Operation Units.

Compare that to the Radeon HD 4790, which has a GPU core clock speed of 600 MHz, and 512 MB of GDDR5 RAM set to run at 800 MHz through a 256-bit bus. It also features 640(128x5) Stream Processors, 32 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Theoretically, the Radeon HD 4790 should perform a little bit faster than the GeForce 8800 GTX overall. (explain)

Radeon HD 4790 102400 MB/sec
GeForce 8800 GTX 86400 MB/sec
Difference: 16000 (19%)

Texel Rate

The GeForce 8800 GTX will be quite a bit (approximately 92%) faster with regards to anisotropic filtering than the Radeon HD 4790. (explain)

GeForce 8800 GTX 36800 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 17600 (92%)

Pixel Rate

The GeForce 8800 GTX will be quite a bit (about 44%) better at anti-aliasing than the Radeon HD 4790, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

GeForce 8800 GTX 13800 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 4200 (44%)

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 8800 GTX

Amazon.com

Check prices at:

Radeon HD 4790

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 8800 GTX Radeon HD 4790
Manufacturer nVidia AMD
Year Nov 2006 2009
Code Name G80 RV790
Memory 768 MB 512 MB
Core Speed 575 MHz 600 MHz
Memory Speed 1800 MHz 3200 MHz
Power (Max TDP) 155 watts (Unknown) watts
Bandwidth 86400 MB/sec 102400 MB/sec
Texel Rate 36800 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 13800 Mpixels/sec 9600 Mpixels/sec
Unified Shaders 128 640(128x5)
Texture Mapping Units 64 32
Render Output Units 24 16
Bus Type GDDR3 GDDR5
Bus Width 384-bit 256-bit
Fab Process 90 nm 55 nm
Transistors 681 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 maximum amount of data (counted in megabytes per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total amount of texture units by the core clock 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines 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 output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce 8800 GTX

Amazon.com

Check prices at:

Radeon HD 4790

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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