Radeon HD 6770 1GB vs Radeon R9 M280X

Intro

Compare all of that to the Radeon R9 M280X, which features GPU core speed of 900 MHz, and 4096 MB of GDDR5 RAM running at 1375 MHz through a 128-bit bus. It also is comprised of 896 SPUs, 56 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M280X		75 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 33 Watts (44%)

Memory Bandwidth

In theory, the Radeon R9 M280X should be 31% quicker than the Radeon HD 6770 1GB overall, due to its greater bandwidth. (explain)

Radeon R9 M280X		88000 MB/sec
Radeon HD 6770 1GB		67200 MB/sec
	Difference: 20800 (31%)

Texel Rate

The Radeon R9 M280X should be quite a bit (more or less 40%) faster with regards to anisotropic filtering than the Radeon HD 6770 1GB. (explain)

Radeon R9 M280X		50400 Mtexels/sec
Radeon HD 6770 1GB		36000 Mtexels/sec
	Difference: 14400 (40%)

Pixel Rate

Both cards have the exact same pixel fill rate, so theoretically they should be equally good at at AA, and be capable of handling the same resolutions. (explain)

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 transported across the external memory interface in a second. It's worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill 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.