GeForce 8800 GTS (G80) 640MB vs Radeon HD 7790

Intro

Compare that to the Radeon HD 7790, which has a core clock frequency of 1000 MHz and a GDDR5 memory frequency of 1500 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It is comprised of 896 SPUs, 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 GTS (G80) 640MB		143 Watts
	Difference: 58 Watts (68%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7790 should in theory be much better than the GeForce 8800 GTS (G80) 640MB in general. (explain)

Radeon HD 7790		96000 MB/sec
GeForce 8800 GTS (G80) 640MB		63360 MB/sec
	Difference: 32640 (52%)

Texel Rate

The Radeon HD 7790 is a lot (more or less 127%) faster with regards to AF than the GeForce 8800 GTS (G80) 640MB. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce 8800 GTS (G80) 640MB		24624 Mtexels/sec
	Difference: 31376 (127%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7790 is superior to the GeForce 8800 GTS (G80) 640MB, by far. (explain)

Radeon HD 7790		16000 Mpixels/sec
GeForce 8800 GTS (G80) 640MB		10260 Mpixels/sec
	Difference: 5740 (56%)

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 data (in units of megabytes per second) that can be moved past the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.