Radeon HD 6750 vs Radeon R9 280

Intro

Compare those specs to the Radeon R9 280, which features GPU clock speed of 933 MHz, and 3072 MB of GDDR5 RAM set to run at 1250 MHz through a 384-bit bus. It also is made up of 1792 SPUs, 112 Texture Address Units, 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

The Radeon R9 280 should in theory be quite a bit faster than the Radeon HD 6750 overall. (explain)

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

Texel Rate

The Radeon R9 280 should be much (more or less 300%) better 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 a high screen resolution is important to you, then the Radeon R9 280 is the winner, and very much so. (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 maximum amount of information (in units of megabytes per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the 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 that the graphics chip can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.