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GeForce 8800 Ultra vs Radeon HD 7790

Intro

The GeForce 8800 Ultra makes use of a 90 nm design. nVidia has clocked the core frequency at 612 MHz. The GDDR3 memory runs at a speed of 1080 MHz on this specific card. It features 128 SPUs along with 64 TAUs and 24 ROPs.

Compare that to the Radeon HD 7790, which uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM runs at a speed of 1500 MHz on this specific model. It features 896 SPUs as well as 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 should be 8% quicker than the Radeon HD 7790 overall, because of its greater data rate. (explain)

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

Texel Rate

The Radeon HD 7790 will be quite a bit (about 43%) faster with regards to AF than the GeForce 8800 Ultra. (explain)

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

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7790 is a better choice, but not by far. (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

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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: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster 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 can be processed in one second. This number is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential 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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