GeForce GTX 285 1GB vs Radeon R9 285

Intro

Compare those specifications to the Radeon R9 285, which has a GPU core clock speed of 918 MHz, and 2048 MB of GDDR5 memory set to run at 1375 MHz through a 256-bit bus. It also is comprised of 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 285 1GB		204 Watts
	Difference: 14 Watts (7%)

Memory Bandwidth

The Radeon R9 285 should in theory perform just a bit faster than the GeForce GTX 285 1GB in general. (explain)

Radeon R9 285		176000 MB/sec
GeForce GTX 285 1GB		158976 MB/sec
	Difference: 17024 (11%)

Texel Rate

The Radeon R9 285 is much (about 98%) better at AF than the GeForce GTX 285 1GB. (explain)

Radeon R9 285		102816 Mtexels/sec
GeForce GTX 285 1GB		51840 Mtexels/sec
	Difference: 50976 (98%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R9 285 is the winner, by a large margin. (explain)

Radeon R9 285		29376 Mpixels/sec
GeForce GTX 285 1GB		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: Memory bandwidth is the largest amount of data (in units of MB per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.