Geforce GTX 780 vs Radeon R7 250X 2GB

Intro

Compare that to the Radeon R7 250X 2GB, which uses a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 memory works at a speed of 1125 MHz on this specific model. It features 640 SPUs along with 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

In theory, the Geforce GTX 780 is 301% faster than the Radeon R7 250X 2GB overall, because of its higher bandwidth. (explain)

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

Texel Rate

The Geforce GTX 780 will be much (approximately 314%) faster with regards to anisotropic 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 should be quite a bit (more or less 159%) better at FSAA than the Radeon R7 250X 2GB, and also will be able to handle higher resolutions without slowing down too much. (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 max amount of data (in units of megabytes per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total amount of 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 processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.