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

Intro

Compare all that to the Radeon R9 390 8G, which comes with clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 8192 MB of GDDR5 memory. It features 2560 SPUs as well as 160 TAUs and 64 Rasterization Operator Units.

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

Theoretically speaking, the Radeon R9 390 8G is 500% faster than the Radeon HD 6670 (OEM) 1GB overall, 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 should be much (about 733%) faster with regards to anisotropic filtering 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 using a high screen resolution is important to you, then the Radeon R9 390 8G is a better choice, by a large margin. (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: Bandwidth is the maximum amount of data (counted in MB per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the bus width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.