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GeForce 8800 GTX vs Radeon HD 4790

Intro

The GeForce 8800 GTX makes use of a 90 nm design. nVidia has clocked the core frequency at 575 MHz. The GDDR3 memory works at a speed of 900 MHz on this specific model. It features 128 SPUs as well as 64 TAUs and 24 ROPs.

Compare that to the Radeon HD 4790, which uses a 55 nm design. AMD has clocked the core speed at 600 MHz. The GDDR5 memory runs at a speed of 800 MHz on this particular model. It features 640(128x5) SPUs as well as 32 TAUs and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 4790, in theory, should be just a bit faster than the GeForce 8800 GTX in general. (explain)

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

Texel Rate

The GeForce 8800 GTX is a lot (approximately 92%) better at 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 is quite a bit (approximately 44%) better at FSAA than the Radeon HD 4790, and also capable of handling higher screen resolutions while still performing well. (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: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transported across 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 memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR 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 calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max 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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