Geforce GTX 680 vs Radeon R7 250X 2GB

Intro

Compare those specs to the Radeon R7 250X 2GB, which features core speeds of 1000 MHz on the GPU, and 1125 MHz on the 2048 MB of GDDR5 memory. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 2GB		95 Watts
Geforce GTX 680		195 Watts
	Difference: 100 Watts (105%)

Memory Bandwidth

In theory, the Geforce GTX 680 will be 167% faster than the Radeon R7 250X 2GB overall, because of its greater bandwidth. (explain)

Geforce GTX 680		192256 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 120256 (167%)

Texel Rate

The Geforce GTX 680 is a lot (more or less 222%) faster with regards to anisotropic filtering than the Radeon R7 250X 2GB. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon R7 250X 2GB		40000 Mtexels/sec
	Difference: 88768 (222%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Geforce GTX 680 is the winner, and very much so. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon R7 250X 2GB		16000 Mpixels/sec
	Difference: 16192 (101%)

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 information (measured in megabytes per second) that can be transported across the external memory interface in a second. The number is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR RAM, it should be multiplied by 2 once 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 higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.