Radeon HD 6750 vs Radeon R9 390X 8G

Intro

Compare all that to the Radeon R9 390X 8G, which has GPU clock speed of 1050 MHz, and 8192 MB of GDDR5 RAM running at 1500 MHz through a 512-bit bus. It also is comprised of 2816 Stream Processors, 176 TAUs, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

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

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

Texel Rate

The Radeon R9 390X 8G will be a lot (about 608%) faster with regards to AF than the Radeon HD 6750. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon HD 6750		26100 Mtexels/sec
	Difference: 158700 (608%)

Pixel Rate

The Radeon R9 390X 8G is a lot (approximately 479%) faster with regards to full screen anti-aliasing than the Radeon HD 6750, and able to handle higher screen resolutions more effectively. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon HD 6750		11600 Mpixels/sec
	Difference: 55600 (479%)

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 megabytes per second) that can be transported over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the 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 number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total amount of texture units by the core speed of the chip. The better 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 maximum number of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.