Radeon HD 6670 (OEM) vs Radeon HD 6950 2GB

Intro

Compare all that to the Radeon HD 6950 2GB, which comes with a core clock frequency of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit bus, and uses a 40 nm design. It is comprised of 1408 SPUs, 88 TAUs, 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 HD 6950 2GB		200 Watts
	Difference: 137 Watts (217%)

Memory Bandwidth

In theory, the Radeon HD 6950 2GB should be a lot faster than the Radeon HD 6670 (OEM) in general. (explain)

Radeon HD 6950 2GB		160000 MB/sec
Radeon HD 6670 (OEM)		64000 MB/sec
	Difference: 96000 (150%)

Texel Rate

The Radeon HD 6950 2GB is a lot (about 267%) more effective at anisotropic filtering than the Radeon HD 6670 (OEM). (explain)

Radeon HD 6950 2GB		70400 Mtexels/sec
Radeon HD 6670 (OEM)		19200 Mtexels/sec
	Difference: 51200 (267%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6950 2GB is superior to the Radeon HD 6670 (OEM), and very much so. (explain)

Radeon HD 6950 2GB		25600 Mpixels/sec
Radeon HD 6670 (OEM)		6400 Mpixels/sec
	Difference: 19200 (300%)

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 (measured in MB per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the clock 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 rate also depends 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 get to the maximum fill rate.