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GeForce 8800 Ultra vs Radeon HD 4790

Intro

The GeForce 8800 Ultra comes with core speeds of 612 MHz on the GPU, and 1080 MHz on the 768 MB of GDDR3 memory. It features 128 SPUs along with 64 TAUs and 24 Rasterization Operator Units.

Compare all of that to the Radeon HD 4790, which comes with 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 is comprised of 640(128x5) Stream Processors, 32 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

Performance-wise, the GeForce 8800 Ultra should theoretically be a small bit superior to the Radeon HD 4790 overall. (explain)

GeForce 8800 Ultra 103680 MB/sec
Radeon HD 4790 102400 MB/sec
Difference: 1280 (1%)

Texel Rate

The GeForce 8800 Ultra will be much (more or less 104%) better at texture filtering than the Radeon HD 4790. (explain)

GeForce 8800 Ultra 39168 Mtexels/sec
Radeon HD 4790 19200 Mtexels/sec
Difference: 19968 (104%)

Pixel Rate

If using a high resolution is important to you, then the GeForce 8800 Ultra is the winner, by far. (explain)

GeForce 8800 Ultra 14688 Mpixels/sec
Radeon HD 4790 9600 Mpixels/sec
Difference: 5088 (53%)

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 Ultra

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 Ultra Radeon HD 4790
Manufacturer nVidia AMD
Year May 2007 2009
Code Name G80 RV790
Memory 768 MB 512 MB
Core Speed 612 MHz 600 MHz
Memory Speed 2160 MHz 3200 MHz
Power (Max TDP) 171 watts (Unknown) watts
Bandwidth 103680 MB/sec 102400 MB/sec
Texel Rate 39168 Mtexels/sec 19200 Mtexels/sec
Pixel Rate 14688 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 maximum amount of data (in units of MB per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's 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 are processed per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the video 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 could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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GeForce 8800 Ultra

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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