Radeon HD 6670 (OEM) vs Radeon HD 6770 1GB

Intro

Compare all of that to the Radeon HD 6770 1GB, which uses a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM works at a speed of 1050 MHz on this particular card. It features 800 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM)		63 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 45 Watts (71%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6770 1GB should theoretically be a small bit better than the Radeon HD 6670 (OEM) in general. (explain)

Radeon HD 6770 1GB		67200 MB/sec
Radeon HD 6670 (OEM)		64000 MB/sec
	Difference: 3200 (5%)

Texel Rate

The Radeon HD 6770 1GB will be quite a bit (more or less 88%) faster with regards to AF than the Radeon HD 6670 (OEM). (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon HD 6670 (OEM)		19200 Mtexels/sec
	Difference: 16800 (88%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6770 1GB is the winner, and very much so. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
Radeon HD 6670 (OEM)		6400 Mpixels/sec
	Difference: 8000 (125%)

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 megabytes per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.