GeForce GTX 285 1GB vs Radeon R9 270

Intro

Compare that to the Radeon R9 270, which comes with a clock frequency of 900 MHz and a GDDR5 memory frequency of 1400 MHz. It also uses a 256-bit bus, and uses a 28 nm design. It is comprised of 1280 SPUs, 80 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270		150 Watts
GeForce GTX 285 1GB		204 Watts
	Difference: 54 Watts (36%)

Memory Bandwidth

The Radeon R9 270, in theory, should be just a bit faster than the GeForce GTX 285 1GB overall. (explain)

Radeon R9 270		179200 MB/sec
GeForce GTX 285 1GB		158976 MB/sec
	Difference: 20224 (13%)

Texel Rate

The Radeon R9 270 should be much (about 39%) more effective at AF than the GeForce GTX 285 1GB. (explain)

Radeon R9 270		72000 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 20160 (39%)

Pixel Rate

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

Radeon R9 270		28800 Mpixels/sec
GeForce GTX 285 1GB		20736 Mpixels/sec
	Difference: 8064 (39%)

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 moved over the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total number of texture units of the card by the core 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 in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.