GeForce GTX 275 vs Radeon R9 285

Intro

Compare those specifications to the Radeon R9 285, which features GPU core speed of 918 MHz, and 2048 MB of GDDR5 RAM running at 1375 MHz through a 256-bit bus. It also is made up of 1792 SPUs, 112 Texture Address Units, and 32 ROPs.

Display Graphs

Hide Graphs

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

Performance-wise, the Radeon R9 285 should theoretically be a lot better than the GeForce GTX 275 overall. (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 anisotropic filtering 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 a high screen resolution is important to you, then the Radeon R9 285 is the winner, and very much so. (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: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be moved over the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, 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 number of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units of the card by the core clock 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly record to the 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 speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.