Radeon HD 4770 vs Radeon HD 6750

Intro

Compare those specifications to the Radeon HD 6750, which has a GPU core clock speed of 725 MHz, and 512 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also is comprised of 720 SPUs, 36 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
Radeon HD 6750		86 Watts
	Difference: 6 Watts (8%)

Memory Bandwidth

In theory, the Radeon HD 6750 should be 25% faster than the Radeon HD 4770 overall, because of its greater data rate. (explain)

Radeon HD 6750		64000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 12800 (25%)

Texel Rate

The Radeon HD 6750 should be a bit (approximately 9%) faster with regards to texture filtering than the Radeon HD 4770. (explain)

Radeon HD 6750		26100 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 2100 (9%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 4770 is a better choice, but not by far. (explain)

Radeon HD 4770		12000 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 400 (3%)

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 max amount of information (in units of megabytes per second) that can be transferred across the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.