Radeon HD 6670 (OEM) vs Radeon R9 M295X

Intro

Compare all that to the Radeon R9 M295X, which comes with a clock frequency of 750 MHz and a GDDR5 memory speed of 1375 MHz. It also makes use of a 256-bit memory bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM)		63 Watts
Radeon R9 M295X		125 Watts
	Difference: 62 Watts (98%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M295X should in theory be much better than the Radeon HD 6670 (OEM) in general. (explain)

Radeon R9 M295X		176000 MB/sec
Radeon HD 6670 (OEM)		64000 MB/sec
	Difference: 112000 (175%)

Texel Rate

The Radeon R9 M295X will be much (approximately 400%) better at texture filtering than the Radeon HD 6670 (OEM). (explain)

Radeon R9 M295X		96000 Mtexels/sec
Radeon HD 6670 (OEM)		19200 Mtexels/sec
	Difference: 76800 (400%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon R9 M295X is the winner, by far. (explain)

Radeon R9 M295X		24000 Mpixels/sec
Radeon HD 6670 (OEM)		6400 Mpixels/sec
	Difference: 17600 (275%)

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 information (measured in MB per second) that can be transported over the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses 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 amount of texture map elements (texels) that are applied per second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.