GeForce GTX 285 1GB vs Radeon R9 285

Intro

Compare those specs to the Radeon R9 285, which comes with core clock speeds of 918 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 RAM. It features 1792 SPUs along with 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

Theoretically speaking, the Radeon R9 285 should 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 a lot (approximately 98%) faster with regards to 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

The Radeon R9 285 is a lot (about 42%) faster with regards to AA than the GeForce GTX 285 1GB, and capable of handling higher screen resolutions without losing too much performance. (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: Bandwidth is the max amount of information (counted in megabytes per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the clock speed of the card. 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 quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.