Radeon HD 6790 vs Radeon R9 M395X

Intro

Compare those specifications to the Radeon R9 M395X, which uses a 28 nm design. AMD has clocked the core speed at 723 MHz. The GDDR5 memory is set to run at a speed of 1250 MHz on this card. It features 2048 SPUs along with 128 TAUs and 32 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 M395X		125 Watts
Radeon HD 6790		150 Watts
	Difference: 25 Watts (20%)

Memory Bandwidth

In theory, the Radeon R9 M395X should be a bit faster than the Radeon HD 6790 in general. (explain)

Radeon R9 M395X		160000 MB/sec
Radeon HD 6790		134400 MB/sec
	Difference: 25600 (19%)

Texel Rate

The Radeon R9 M395X is quite a bit (more or less 175%) better at AF than the Radeon HD 6790. (explain)

Radeon R9 M395X		92544 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 58944 (175%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 M395X is the winner, and very much so. (explain)

Radeon R9 M395X		23136 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 9696 (72%)

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 data (counted in megabytes per second) that can be moved past the external memory interface in one second. The number is worked out 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 ANOTHER 2x. The better 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 amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill 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 max fill rate.