Radeon HD 6770 vs Radeon R9 M290X

Intro

Compare all that to the Radeon R9 M290X, which uses a 28 nm design. AMD has clocked the core speed at 850 MHz. The GDDR5 RAM works at a speed of 1200 MHz on this model. It features 1280 SPUs as well as 80 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M290X		100 Watts
Radeon HD 6770		108 Watts
	Difference: 8 Watts (8%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M290X should in theory be much superior to the Radeon HD 6770 in general. (explain)

Radeon R9 M290X		153600 MB/sec
Radeon HD 6770		67200 MB/sec
	Difference: 86400 (129%)

Texel Rate

The Radeon R9 M290X should be quite a bit (about 89%) faster with regards to anisotropic filtering than the Radeon HD 6770. (explain)

Radeon R9 M290X		68000 Mtexels/sec
Radeon HD 6770		36000 Mtexels/sec
	Difference: 32000 (89%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R9 M290X is the winner, and very much so. (explain)

Radeon R9 M290X		27200 Mpixels/sec
Radeon HD 6770		14400 Mpixels/sec
	Difference: 12800 (89%)

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 data (counted in megabytes per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's 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 number of texture map elements (texels) that are processed per second. This figure is worked out by multiplying the total number of texture units by the core 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 applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.