Radeon HD 6750 vs Radeon R9 390 8G

Intro

Compare those specifications to the Radeon R9 390 8G, which comes with a core clock speed of 1000 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 512-bit memory bus, and uses a 28 nm design. It is made up of 2560 SPUs, 160 Texture Address Units, and 64 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750		86 Watts
Radeon R9 390 8G		275 Watts
	Difference: 189 Watts (220%)

Memory Bandwidth

As far as performance goes, the Radeon R9 390 8G should in theory be a lot better than the Radeon HD 6750 overall. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 6750		64000 MB/sec
	Difference: 320000 (500%)

Texel Rate

The Radeon R9 390 8G will be quite a bit (about 513%) more effective at AF than the Radeon HD 6750. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 6750		26100 Mtexels/sec
	Difference: 133900 (513%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 390 8G is superior to the Radeon HD 6750, and very much so. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 52400 (452%)

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 max amount of data (in units of MB per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the interface 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 4 instead. The higher the card's memory bandwidth, the better 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 calculated by multiplying the total amount of 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 one second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.