Radeon HD 6790 vs Radeon R9 M385X

Intro

Compare those specs to the Radeon R9 M385X, which features a core clock speed of 1100 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 128-bit bus, and uses a 28 nm design. It is made up of 896 SPUs, 56 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

The Radeon HD 6790 should theoretically be much faster than the Radeon R9 M385X overall. (explain)

Radeon HD 6790		134400 MB/sec
Radeon R9 M385X		96000 MB/sec
	Difference: 38400 (40%)

Texel Rate

The Radeon R9 M385X will be quite a bit (more or less 83%) better at anisotropic filtering than the Radeon HD 6790. (explain)

Radeon R9 M385X		61600 Mtexels/sec
Radeon HD 6790		33600 Mtexels/sec
	Difference: 28000 (83%)

Pixel Rate

The Radeon R9 M385X will be much (about 31%) more effective at full screen anti-aliasing than the Radeon HD 6790, and will be able to handle higher resolutions more effectively. (explain)

Radeon R9 M385X		17600 Mpixels/sec
Radeon HD 6790		13440 Mpixels/sec
	Difference: 4160 (31%)

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 (measured in megabytes per second) that can be transported across the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 amount of texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.