GeForce 8800 Ultra vs Radeon R7 250X 2GB

Intro

Compare those specifications to the Radeon R7 250X 2GB, which comes with GPU clock speed of 1000 MHz, and 2048 MB of GDDR5 RAM running at 1125 MHz through a 128-bit bus. It also is made up 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 Ultra		171 Watts
	Difference: 76 Watts (80%)

Memory Bandwidth

The GeForce 8800 Ultra should in theory be a lot faster than the Radeon R7 250X 2GB overall. (explain)

GeForce 8800 Ultra		103680 MB/sec
Radeon R7 250X 2GB		72000 MB/sec
	Difference: 31680 (44%)

Texel Rate

The Radeon R7 250X 2GB will be a bit (about 2%) more effective at texture filtering than the GeForce 8800 Ultra. (explain)

Radeon R7 250X 2GB		40000 Mtexels/sec
GeForce 8800 Ultra		39168 Mtexels/sec
	Difference: 832 (2%)

Pixel Rate

The Radeon R7 250X 2GB should be a small bit (more or less 9%) faster with regards to full screen anti-aliasing than the GeForce 8800 Ultra, and will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon R7 250X 2GB		16000 Mpixels/sec
GeForce 8800 Ultra		14688 Mpixels/sec
	Difference: 1312 (9%)

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 maximum amount of information (in units of megabytes per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total texture units of the card 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 most pixels that the graphics chip can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the card's clock speed. 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 output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.