Radeon HD 6750 1GB vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which comes with a GPU core clock 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 Texture Address Units, and 32 Raster Operation Units.

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

The Radeon R9 M390X should theoretically perform much faster than the Radeon HD 6750 1GB in general. (explain)

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

Texel Rate

The Radeon R9 M390X should be a lot (more or less 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 using a high screen resolution 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 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 maximum amount of data (measured in megabytes per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, 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 per second. This is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. 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.