Radeon HD 6670 (OEM) 1GB vs Radeon R9 390 8G

Intro

Compare those specifications to the Radeon R9 390 8G, which makes use of a 28 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 memory runs at a frequency of 1500 MHz on this specific card. It features 2560 SPUs as well as 160 TAUs and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM) 1GB		63 Watts
Radeon R9 390 8G		275 Watts
	Difference: 212 Watts (337%)

Memory Bandwidth

In theory, the Radeon R9 390 8G will be 500% quicker than the Radeon HD 6670 (OEM) 1GB in general, due to its greater data rate. (explain)

Radeon R9 390 8G		384000 MB/sec
Radeon HD 6670 (OEM) 1GB		64000 MB/sec
	Difference: 320000 (500%)

Texel Rate

The Radeon R9 390 8G will be much (more or less 733%) more effective at AF than the Radeon HD 6670 (OEM) 1GB. (explain)

Radeon R9 390 8G		160000 Mtexels/sec
Radeon HD 6670 (OEM) 1GB		19200 Mtexels/sec
	Difference: 140800 (733%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R9 390 8G is a better choice, and very much so. (explain)

Radeon R9 390 8G		64000 Mpixels/sec
Radeon HD 6670 (OEM) 1GB		6400 Mpixels/sec
	Difference: 57600 (900%)

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 (counted in megabytes per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.