GeForce GTX 285 2GB vs Radeon R9 270

Intro

Compare those specifications to the Radeon R9 270, which uses a 28 nm design. AMD has set the core speed at 900 MHz. The GDDR5 memory works at a frequency of 1400 MHz on this model. It features 1280 SPUs as well as 80 Texture Address Units and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270		150 Watts
GeForce GTX 285 2GB		204 Watts
	Difference: 54 Watts (36%)

Memory Bandwidth

In theory, the Radeon R9 270 will be 13% quicker than the GeForce GTX 285 2GB overall, due to its greater data rate. (explain)

Radeon R9 270		179200 MB/sec
GeForce GTX 285 2GB		158976 MB/sec
	Difference: 20224 (13%)

Texel Rate

The Radeon R9 270 will be a lot (approximately 39%) better at anisotropic filtering than the GeForce GTX 285 2GB. (explain)

Radeon R9 270		72000 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 20160 (39%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 270 is the winner, and very much so. (explain)

Radeon R9 270		28800 Mpixels/sec
GeForce GTX 285 2GB		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: Memory bandwidth is the max amount of data (counted in MB per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the card's bus width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units 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 applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.