Radeon HD 6750 1GB vs Radeon R9 390 8G

Intro

Compare those specs to the Radeon R9 390 8G, which makes use of a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM runs at a frequency of 1500 MHz on this particular card. It features 2560 SPUs along with 160 TAUs and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		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 theoretically be quite a bit better than the Radeon HD 6750 1GB overall. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 320000 (500%)

Texel Rate

The Radeon R9 390 8G is much (more or less 513%) better at anisotropic filtering than the Radeon HD 6750 1GB. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 133900 (513%)

Pixel Rate

The Radeon R9 390 8G should be a lot (about 452%) better at AA than the Radeon HD 6750 1GB, and also will be able to handle higher screen resolutions while still performing well. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon HD 6750 1GB		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 largest amount of information (counted in megabytes per second) that can be transported over the external memory interface in a second. The number is calculated by multiplying the interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This figure is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to the local memory per 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 - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.