Radeon HD 6750 1GB vs Radeon R9 M390X

Intro

Compare those specs to the Radeon R9 M390X, which comes with a clock speed of 723 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit memory bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		86 Watts
Radeon R9 M390X		125 Watts
	Difference: 39 Watts (45%)

Memory Bandwidth

Performance-wise, the Radeon R9 M390X should theoretically be quite a bit better than the Radeon HD 6750 1GB overall. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 96000 (150%)

Texel Rate

The Radeon R9 M390X will be quite a bit (about 255%) faster with regards to anisotropic filtering than the Radeon HD 6750 1GB. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 66444 (255%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 M390X is the winner, and very much so. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 6750 1GB		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: Memory bandwidth is the max amount of data (counted in MB per second) that can be moved over the external memory interface in one second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the 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 number of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units of the card by the core 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 processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record 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 - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.