GeForce 8800 GT 256MB vs Radeon R7 250X

Intro

Compare those specifications to the Radeon R7 250X, which comes with a core clock frequency of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It 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		95 Watts
GeForce 8800 GT 256MB		105 Watts
	Difference: 10 Watts (11%)

Memory Bandwidth

In theory, the Radeon R7 250X will be 61% quicker than the GeForce 8800 GT 256MB overall, because of its higher data rate. (explain)

Radeon R7 250X		72000 MB/sec
GeForce 8800 GT 256MB		44800 MB/sec
	Difference: 27200 (61%)

Texel Rate

The Radeon R7 250X should be just a bit (more or less 19%) faster with regards to anisotropic filtering than the GeForce 8800 GT 256MB. (explain)

Radeon R7 250X		40000 Mtexels/sec
GeForce 8800 GT 256MB		33600 Mtexels/sec
	Difference: 6400 (19%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon R7 250X is superior to the GeForce 8800 GT 256MB, by a large margin. (explain)

Radeon R7 250X		16000 Mpixels/sec
GeForce 8800 GT 256MB		9600 Mpixels/sec
	Difference: 6400 (67%)

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 largest amount of data (measured in megabytes per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.