Radeon HD 4770 vs Radeon HD 6750 1GB

Intro

Compare all of that to the Radeon HD 6750 1GB, which makes use of a 40 nm design. AMD has clocked the core frequency at 725 MHz. The GDDR5 RAM is set to run at a frequency of 1000 MHz on this particular card. It features 720 SPUs along with 36 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
Radeon HD 6750 1GB		86 Watts
	Difference: 6 Watts (8%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6750 1GB should be 25% quicker than the Radeon HD 4770 in general, due to its higher data rate. (explain)

Radeon HD 6750 1GB		64000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 12800 (25%)

Texel Rate

The Radeon HD 6750 1GB is just a bit (about 9%) more effective at anisotropic filtering than the Radeon HD 4770. (explain)

Radeon HD 6750 1GB		26100 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 2100 (9%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 4770 is a better choice, but only just. (explain)

Radeon HD 4770		12000 Mpixels/sec
Radeon HD 6750 1GB		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: Memory bandwidth is the largest amount of data (measured in MB per second) that can be transferred across the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better 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 can be processed per second. This is calculated by multiplying the total number of texture units of the card by the core 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). 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 reach the max fill rate.