GeForce GTX 275 vs Radeon R9 285

Intro

Compare those specs to the Radeon R9 285, which comes with a GPU core clock speed of 918 MHz, and 2048 MB of GDDR5 RAM running at 1375 MHz through a 256-bit bus. It also features 1792 SPUs, 112 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 285		190 Watts
GeForce GTX 275		219 Watts
	Difference: 29 Watts (15%)

Memory Bandwidth

As far as performance goes, the Radeon R9 285 should in theory be much better than the GeForce GTX 275 in general. (explain)

Radeon R9 285		176000 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 48992 (39%)

Texel Rate

The Radeon R9 285 will be a lot (approximately 103%) more effective at AF than the GeForce GTX 275. (explain)

Radeon R9 285		102816 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 52176 (103%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R9 285 is the winner, by far. (explain)

Radeon R9 285		29376 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 11652 (66%)

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 megabytes per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.