Geforce GTX 680 vs Radeon R7 250X 2GB

Intro

Compare those specs to the Radeon R7 250X 2GB, which comes with a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also is comprised of 640 SPUs, 40 TAUs, and 16 ROPs.

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

Theoretically speaking, the Geforce GTX 680 should perform a lot faster than the Radeon R7 250X 2GB in general. (explain)

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

Texel Rate

The Geforce GTX 680 will be a lot (approximately 222%) faster with regards to texture 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

The Geforce GTX 680 should be much (more or less 101%) better at AA than the Radeon R7 250X 2GB, and also will be capable of handling higher resolutions without slowing down too much. (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 max amount of information (in units of MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the 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 are applied per second. This 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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 potential to reach the maximum fill rate.