Radeon HD 6790 vs Radeon R9 M270X

Intro

Compare that to the Radeon R9 M270X, which uses a 28 nm design. AMD has clocked the core speed at 725 MHz. The GDDR5 RAM works at a speed of 1125 MHz on this specific model. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 6790 should in theory be a lot better than the Radeon R9 M270X overall. (explain)

Radeon HD 6790		134400 MB/sec
Radeon R9 M270X		72000 MB/sec
	Difference: 62400 (87%)

Texel Rate

The Radeon HD 6790 will be a little bit (more or less 16%) better at texture filtering than the Radeon R9 M270X. (explain)

Radeon HD 6790		33600 Mtexels/sec
Radeon R9 M270X		29000 Mtexels/sec
	Difference: 4600 (16%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 6790 is the winner, though not by far. (explain)

Radeon HD 6790		13440 Mpixels/sec
Radeon R9 M270X		11600 Mpixels/sec
	Difference: 1840 (16%)

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: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

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