GeForce GTX 275 vs Radeon R9 390X 8G

Intro

Compare that to the Radeon R9 390X 8G, which comes with core clock speeds of 1050 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2816 SPUs along with 176 TAUs and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 275		219 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 56 Watts (26%)

Memory Bandwidth

In theory, the Radeon R9 390X 8G is 202% quicker than the GeForce GTX 275 in general, due to its greater bandwidth. (explain)

Radeon R9 390X 8G		384000 MB/sec
GeForce GTX 275		127008 MB/sec
	Difference: 256992 (202%)

Texel Rate

The Radeon R9 390X 8G will be much (approximately 265%) more effective at anisotropic filtering than the GeForce GTX 275. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
GeForce GTX 275		50640 Mtexels/sec
	Difference: 134160 (265%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R9 390X 8G is superior to the GeForce GTX 275, and very much so. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
GeForce GTX 275		17724 Mpixels/sec
	Difference: 49476 (279%)

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 data (in units of MB per second) that can be transported past the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.