GeForce GTX 295 vs Radeon R9 285

Intro

Compare those specs to the Radeon R9 285, which comes with clock speeds of 918 MHz on the GPU, and 1375 MHz on the 2048 MB of GDDR5 memory. It features 1792 SPUs as well as 112 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 285		190 Watts
GeForce GTX 295		289 Watts
	Difference: 99 Watts (52%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 295 should be much faster than the Radeon R9 285 overall. (explain)

GeForce GTX 295		223776 MB/sec
Radeon R9 285		176000 MB/sec
	Difference: 47776 (27%)

Texel Rate

The Radeon R9 285 should be a little bit (about 12%) faster with regards to texture filtering than the GeForce GTX 295. (explain)

Radeon R9 285		102816 Mtexels/sec
GeForce GTX 295		92160 Mtexels/sec
	Difference: 10656 (12%)

Pixel Rate

The GeForce GTX 295 is a bit (about 10%) faster with regards to FSAA than the Radeon R9 285, and should be able to handle higher screen resolutions more effectively. (explain)

GeForce GTX 295		32256 Mpixels/sec
Radeon R9 285		29376 Mpixels/sec
	Difference: 2880 (10%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better 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 number of texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total texture units of the card by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour 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 fill 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 get to the max fill rate.