Radeon HD 6750 vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which comes with GPU core speed of 723 MHz, and 4096 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also is made up of 2048 Stream Processors, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750		86 Watts
Radeon R9 M390X		125 Watts
	Difference: 39 Watts (45%)

Memory Bandwidth

In theory, the Radeon R9 M390X will be 150% quicker than the Radeon HD 6750 overall, because of its higher bandwidth. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 96000 (150%)

Texel Rate

The Radeon R9 M390X is quite a bit (more or less 255%) faster with regards to texture filtering than the Radeon HD 6750. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 6750		26100 Mtexels/sec
	Difference: 66444 (255%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 M390X is the winner, by a large margin. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 11536 (99%)

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 largest amount of information (measured in MB per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the bus width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This number is calculated 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka 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 - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.