GeForce 8800 GTX vs Radeon R7 250X 2GB

Intro

Compare that to the Radeon R7 250X 2GB, which comes with a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 memory set to run at 1125 MHz through a 128-bit bus. It also is comprised of 640 SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 250X 2GB		95 Watts
GeForce 8800 GTX		155 Watts
	Difference: 60 Watts (63%)

Memory Bandwidth

In theory, the GeForce 8800 GTX should be 20% quicker than the Radeon R7 250X 2GB overall, due to its higher data rate. (explain)

GeForce 8800 GTX		86400 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 14400 (20%)

Texel Rate

The Radeon R7 250X 2GB is a little bit (about 9%) more effective at anisotropic filtering than the GeForce 8800 GTX. (explain)

Radeon R7 250X 2GB		40000 Mtexels/sec
GeForce 8800 GTX		36800 Mtexels/sec
	Difference: 3200 (9%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R7 250X 2GB is the winner, though only just barely. (explain)

Radeon R7 250X 2GB		16000 Mpixels/sec
GeForce 8800 GTX		13800 Mpixels/sec
	Difference: 2200 (16%)

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 (counted in megabytes per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one second. This is worked out by multiplying the total amount of texture units 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 applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core 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 is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.