GeForce GTX 275 vs Radeon HD 7790

Intro

Compare those specs to the Radeon HD 7790, which makes use of 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 model. 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 GTX 275		219 Watts
	Difference: 134 Watts (158%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 275 should be 32% faster than the Radeon HD 7790 in general, due to its greater data rate. (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 small bit (more or less 11%) better at texture filtering than the GeForce GTX 275. (explain)

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

Pixel Rate

The GeForce GTX 275 should be a little bit (approximately 11%) more effective at anti-aliasing than the Radeon HD 7790, and should be able to handle higher screen resolutions more effectively. (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 (counted in megabytes per second) that can be transferred past the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per 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 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 rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.