Radeon HD 4850 X2 1GB vs Radeon HD 6750

Intro

Compare all that to the Radeon HD 6750, which has GPU core speed of 725 MHz, and 512 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also is made up of 720 SPUs, 36 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750		86 Watts
Radeon HD 4850 X2 1GB		250 Watts
	Difference: 164 Watts (191%)

Memory Bandwidth

In theory, the Radeon HD 4850 X2 1GB should be quite a bit faster than the Radeon HD 6750 in general. (explain)

Radeon HD 4850 X2 1GB		127104 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 63104 (99%)

Texel Rate

The Radeon HD 4850 X2 1GB will be quite a bit (approximately 92%) more effective at texture filtering than the Radeon HD 6750. (explain)

Radeon HD 4850 X2 1GB		50000 Mtexels/sec
Radeon HD 6750		26100 Mtexels/sec
	Difference: 23900 (92%)

Pixel Rate

The Radeon HD 4850 X2 1GB should be a lot (more or less 72%) better at AA than the Radeon HD 6750, and also should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 4850 X2 1GB		20000 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 8400 (72%)

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: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.