Radeon HD 6750 vs Radeon R9 390 8G

Intro

Compare all that to the Radeon R9 390 8G, which has clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 RAM. It features 2560 SPUs along with 160 Texture Address Units and 64 Rasterization Operator 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

Theoretically speaking, the Radeon R9 390 8G should be a lot faster than the Radeon HD 6750 in general. (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 a lot (approximately 513%) faster with regards to 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

The Radeon R9 390 8G is a lot (more or less 452%) better at anti-aliasing than the Radeon HD 6750, and able to handle higher screen resolutions better. (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: Memory bandwidth is the largest amount of data (counted in MB per second) that can be moved over the external memory interface in a second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 are processed in one second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics 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 number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.