Radeon HD 6750 vs Radeon R9 280

Intro

Compare all that to the Radeon R9 280, which features a clock speed of 933 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 384-bit bus, and makes use of a 28 nm design. It features 1792 SPUs, 112 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750		86 Watts
Radeon R9 280		250 Watts
	Difference: 164 Watts (191%)

Memory Bandwidth

Theoretically, the Radeon R9 280 should perform quite a bit faster than the Radeon HD 6750 in general. (explain)

Radeon R9 280		240000 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 176000 (275%)

Texel Rate

The Radeon R9 280 will be quite a bit (approximately 300%) more effective at anisotropic filtering than the Radeon HD 6750. (explain)

Radeon R9 280		104496 Mtexels/sec
Radeon HD 6750		26100 Mtexels/sec
	Difference: 78396 (300%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R9 280 is a better choice, by a large margin. (explain)

Radeon R9 280		29856 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 18256 (157%)

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 (measured in megabytes per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video 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 most pixels the video card can possibly write to its 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 the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.