Radeon HD 4670 1GB vs Radeon HD 6750

Intro

Compare all that to the Radeon HD 6750, which features 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 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 4670 1GB		70 Watts
Radeon HD 6750		86 Watts
	Difference: 16 Watts (23%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6750 should in theory be quite a bit superior to the Radeon HD 4670 1GB in general. (explain)

Radeon HD 6750		64000 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 28800 (82%)

Texel Rate

The Radeon HD 6750 should be a bit (about 9%) more effective at anisotropic filtering than the Radeon HD 4670 1GB. (explain)

Radeon HD 6750		26100 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 2100 (9%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6750 is the winner, and very much so. (explain)

Radeon HD 6750		11600 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 5600 (93%)

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 maximum amount of information (measured in megabytes per second) that can be moved over the external memory interface in a second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 number of texture map elements (texels) that are processed in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can 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 ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many 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.