GeForce GTX 275 vs Radeon R9 270

Intro

Compare those specs to the Radeon R9 270, which has clock speeds of 900 MHz on the GPU, and 1400 MHz on the 2048 MB of GDDR5 RAM. It features 1280 SPUs as well as 80 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270		150 Watts
GeForce GTX 275		219 Watts
	Difference: 69 Watts (46%)

Memory Bandwidth

As far as performance goes, the Radeon R9 270 should in theory be much better than the GeForce GTX 275 overall. (explain)

Radeon R9 270		179200 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 52192 (41%)

Texel Rate

The Radeon R9 270 is much (more or less 42%) faster with regards to AF than the GeForce GTX 275. (explain)

Radeon R9 270		72000 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 21360 (42%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 270 is the winner, by a large margin. (explain)

Radeon R9 270		28800 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 11076 (62%)

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 data (measured in MB per second) that can be transported past the external memory interface in a second. The number is worked out 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 it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, 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 of the card by the core clock speed of the chip. The higher the texel rate, the better the video 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 card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.