GeForce GTX 285 2GB vs Radeon R9 285

Intro

Compare all that to the Radeon R9 285, which comes with a GPU core clock speed of 918 MHz, and 2048 MB of GDDR5 RAM set to run at 1375 MHz through a 256-bit bus. It also is comprised of 1792 Stream Processors, 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 285 2GB		204 Watts
	Difference: 14 Watts (7%)

Memory Bandwidth

The Radeon R9 285 should in theory perform a small bit faster than the GeForce GTX 285 2GB in general. (explain)

Radeon R9 285		176000 MB/sec
GeForce GTX 285 2GB		158976 MB/sec
	Difference: 17024 (11%)

Texel Rate

The Radeon R9 285 should be a lot (about 98%) faster with regards to texture filtering than the GeForce GTX 285 2GB. (explain)

Radeon R9 285		102816 Mtexels/sec
GeForce GTX 285 2GB		51840 Mtexels/sec
	Difference: 50976 (98%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 285 is superior to the GeForce GTX 285 2GB, by far. (explain)

Radeon R9 285		29376 Mpixels/sec
GeForce GTX 285 2GB		20736 Mpixels/sec
	Difference: 8640 (42%)

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 maximum amount of information (measured in MB per second) that can be moved over the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 again. If 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, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a 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 amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.