GeForce GTX 275 vs Radeon HD 6790

Intro

Compare that to the Radeon HD 6790, which uses a 40 nm design. AMD has clocked the core speed at 840 MHz. The GDDR5 memory is set to run at a frequency of 1050 MHz on this specific model. It features 800 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

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 should be 6% faster than the GeForce GTX 275 in general, due to its greater data rate. (explain)

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

Texel Rate

The GeForce GTX 275 is a lot (about 51%) more effective at texture filtering than the Radeon HD 6790. (explain)

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

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 275 is a better choice, by far. (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 max amount of data (measured in MB per second) that can be transferred past the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 are processed per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.