Radeon HD 3850 X2 vs Radeon HD 7750

Intro

Compare all that to the Radeon HD 7750, which comes with core speeds of 800 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. It features 512 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon HD 3850 X2 is 47% quicker than the Radeon HD 7750 overall, because of its greater data rate. (explain)

Radeon HD 3850 X2		105984 MB/sec
Radeon HD 7750		72000 MB/sec
	Difference: 33984 (47%)

Texel Rate

The Radeon HD 7750 will be a bit (more or less 20%) more effective at texture filtering than the Radeon HD 3850 X2. (explain)

Radeon HD 7750		25600 Mtexels/sec
Radeon HD 3850 X2		21376 Mtexels/sec
	Difference: 4224 (20%)

Pixel Rate

The Radeon HD 3850 X2 will be quite a bit (approximately 67%) better at anti-aliasing than the Radeon HD 7750, and capable of handling higher resolutions more effectively. (explain)

Radeon HD 3850 X2		21376 Mpixels/sec
Radeon HD 7750		12800 Mpixels/sec
	Difference: 8576 (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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred over the external memory interface in one second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number 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 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 in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. 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 get to the maximum fill rate.