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GeForce 8800 Ultra vs Radeon HD 7790

Intro

The GeForce 8800 Ultra comes with a clock frequency of 612 MHz and a GDDR3 memory speed of 1080 MHz. It also makes use of a 384-bit memory bus, and makes use of a 90 nm design. It features 128 SPUs, 64 Texture Address Units, and 24 Raster Operation Units.

Compare those specifications to the Radeon HD 7790, which makes use of a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory works at a speed of 1500 MHz on this particular card. It features 896 SPUs along with 56 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790 85 Watts
GeForce 8800 Ultra 171 Watts
Difference: 86 Watts (101%)

Memory Bandwidth

Theoretically speaking, the GeForce 8800 Ultra will be 8% quicker than the Radeon HD 7790 in general, because of its higher data rate. (explain)

GeForce 8800 Ultra 103680 MB/sec
Radeon HD 7790 96000 MB/sec
Difference: 7680 (8%)

Texel Rate

The Radeon HD 7790 should be much (more or less 43%) more effective at texture filtering than the GeForce 8800 Ultra. (explain)

Radeon HD 7790 56000 Mtexels/sec
GeForce 8800 Ultra 39168 Mtexels/sec
Difference: 16832 (43%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7790 is the winner, but only just. (explain)

Radeon HD 7790 16000 Mpixels/sec
GeForce 8800 Ultra 14688 Mpixels/sec
Difference: 1312 (9%)

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 7790

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 7790
Manufacturer nVidia AMD
Year May 2007 March 2013
Code Name G80 Bonaire XT
Memory 768 MB 1024 MB
Core Speed 612 MHz 1000 MHz
Memory Speed 2160 MHz 6000 MHz
Power (Max TDP) 171 watts 85 watts
Bandwidth 103680 MB/sec 96000 MB/sec
Texel Rate 39168 Mtexels/sec 56000 Mtexels/sec
Pixel Rate 14688 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 128 896
Texture Mapping Units 64 56
Render Output Units 24 16
Bus Type GDDR3 GDDR5
Bus Width 384-bit 128-bit
Fab Process 90 nm 28 nm
Transistors 681 million 2080 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 maximum amount of data (in units of megabytes per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If 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 texture map elements (texels) that are applied per second. This is worked out by multiplying the total number of texture units of the card by the core 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the card's clock speed. 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 many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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GeForce 8800 Ultra

Amazon.com

Check prices at:

Radeon HD 7790

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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