GeForce GTX 275 vs Radeon HD 7790

Intro

Compare those specifications to the Radeon HD 7790, which features core speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 RAM. It features 896 SPUs as well as 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
GeForce GTX 275		219 Watts
	Difference: 134 Watts (158%)

Memory Bandwidth

Theoretically, the GeForce GTX 275 should be quite a bit faster than the Radeon HD 7790 overall. (explain)

GeForce GTX 275		127008 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 31008 (32%)

Texel Rate

The Radeon HD 7790 will be a little bit (about 11%) better at AF than the GeForce GTX 275. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 5360 (11%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTX 275 is the winner, but only just. (explain)

GeForce GTX 275		17724 Mpixels/sec
Radeon HD 7790		16000 Mpixels/sec
	Difference: 1724 (11%)

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 transferred across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core 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 lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.