GeForce 8800 GTS (G92) vs Radeon HD 7790

Intro

Compare those specs to the Radeon HD 7790, which comes with clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 memory. It features 896 SPUs as well as 56 Texture Address Units 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 (G92)		135 Watts
	Difference: 50 Watts (59%)

Memory Bandwidth

Theoretically, the Radeon HD 7790 should perform much faster than the GeForce 8800 GTS (G92) overall. (explain)

Radeon HD 7790		96000 MB/sec
GeForce 8800 GTS (G92)		62080 MB/sec
	Difference: 33920 (55%)

Texel Rate

The Radeon HD 7790 is quite a bit (approximately 35%) faster with regards to anisotropic filtering than the GeForce 8800 GTS (G92). (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce 8800 GTS (G92)		41600 Mtexels/sec
	Difference: 14400 (35%)

Pixel Rate

The Radeon HD 7790 will be much (more or less 54%) better at AA than the GeForce 8800 GTS (G92), and also will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 7790		16000 Mpixels/sec
GeForce 8800 GTS (G92)		10400 Mpixels/sec
	Difference: 5600 (54%)

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 largest amount of information (measured in megabytes per second) that can be transferred across the external memory interface in one 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 memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.