Geforce GTX 780 vs Radeon R7 250X 2GB

Intro

Compare those specs to the Radeon R7 250X 2GB, which uses a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory is set to run at a frequency of 1125 MHz on this particular card. It features 640 SPUs as well as 40 Texture Address Units 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 780		250 Watts
	Difference: 155 Watts (163%)

Memory Bandwidth

The Geforce GTX 780, in theory, should be a lot faster than the Radeon R7 250X 2GB in general. (explain)

Geforce GTX 780		288384 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 216384 (301%)

Texel Rate

The Geforce GTX 780 is quite a bit (about 314%) more effective at texture filtering than the Radeon R7 250X 2GB. (explain)

Geforce GTX 780		165696 Mtexels/sec
Radeon R7 250X 2GB		40000 Mtexels/sec
	Difference: 125696 (314%)

Pixel Rate

The Geforce GTX 780 is quite a bit (about 159%) faster with regards to anti-aliasing than the Radeon R7 250X 2GB, and should be capable of handling higher resolutions better. (explain)

Geforce GTX 780		41424 Mpixels/sec
Radeon R7 250X 2GB		16000 Mpixels/sec
	Difference: 25424 (159%)

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 data (in units of megabytes per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 applied per second. This is calculated 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could 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 colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.