GeForce 8800 Ultra vs Radeon HD 7790

Intro

Compare all of that to the Radeon HD 7790, which uses a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 memory is set to run at a speed of 1500 MHz on this particular card. It features 896 SPUs as well as 56 TAUs and 16 ROPs.

Display Graphs

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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

In theory, the GeForce 8800 Ultra is 8% quicker than the Radeon HD 7790 in general, because of its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 7790 will be a lot (approximately 43%) faster with regards to 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 using a high screen resolution is important to you, then the Radeon HD 7790 is a better choice, 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

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The better 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 most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.