GeForce GTX 980 vs Radeon R7 250X 2GB

Intro

Compare that to the Radeon R7 250X 2GB, which comes with GPU core speed of 1000 MHz, and 2048 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also features 640 Stream Processors, 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 980		165 Watts
	Difference: 70 Watts (74%)

Memory Bandwidth

In theory, the GeForce GTX 980 should be 211% faster than the Radeon R7 250X 2GB overall, because of its higher bandwidth. (explain)

GeForce GTX 980		224000 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 152000 (211%)

Texel Rate

The GeForce GTX 980 is much (approximately 260%) faster with regards to anisotropic filtering than the Radeon R7 250X 2GB. (explain)

GeForce GTX 980		144128 Mtexels/sec
Radeon R7 250X 2GB		40000 Mtexels/sec
	Difference: 104128 (260%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce GTX 980 is superior to the Radeon R7 250X 2GB, by a large margin. (explain)

GeForce GTX 980		72064 Mpixels/sec
Radeon R7 250X 2GB		16000 Mpixels/sec
	Difference: 56064 (350%)

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 information (counted in megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high 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 speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

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