GeForce GTX 275 vs Radeon HD 6790

Intro

Compare that to the Radeon HD 6790, which comes with core clock speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 RAM. It features 800 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6790		150 Watts
GeForce GTX 275		219 Watts
	Difference: 69 Watts (46%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6790 will be 6% faster than the GeForce GTX 275 in general, due to its higher bandwidth. (explain)

Radeon HD 6790		134400 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 7392 (6%)

Texel Rate

The GeForce GTX 275 will be a lot (more or less 51%) more effective at AF than the Radeon HD 6790. (explain)

GeForce GTX 275		50640 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 17040 (51%)

Pixel Rate

The GeForce GTX 275 is a lot (more or less 32%) better at AA than the Radeon HD 6790, and also should be able to handle higher resolutions more effectively. (explain)

GeForce GTX 275		17724 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 4284 (32%)

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 MB per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total number of texture units of the card by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.