Radeon HD 6790 vs Radeon R9 M275X

Intro

Compare those specs to the Radeon R9 M275X, which makes use of a 28 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 memory works at a frequency of 1125 MHz on this card. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M275X		50 Watts
Radeon HD 6790		150 Watts
	Difference: 100 Watts (200%)

Memory Bandwidth

The Radeon HD 6790 should theoretically perform quite a bit faster than the Radeon R9 M275X overall. (explain)

Radeon HD 6790		134400 MB/sec
Radeon R9 M275X		72000 MB/sec
	Difference: 62400 (87%)

Texel Rate

The Radeon R9 M275X is a small bit (about 7%) better at texture filtering than the Radeon HD 6790. (explain)

Radeon R9 M275X		36000 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 2400 (7%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 M275X is superior to the Radeon HD 6790, not by a very large margin though. (explain)

Radeon R9 M275X		14400 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 960 (7%)

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 transported past the external memory interface within a second. It's worked out by multiplying the interface width by the speed of its memory. In the case of DDR RAM, it must 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher 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 card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount 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 rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.