Radeon HD 6670 (OEM) vs Radeon HD 6770

Intro

Compare those specs to the Radeon HD 6770, which has core speeds of 900 MHz on the GPU, and 1050 MHz on the 512 MB of GDDR5 RAM. It features 800 SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6770		1520 points
Radeon HD 6670 (OEM)		1120 points
	Difference: 400 (36%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

Theoretically, the Radeon HD 6770 should perform just a bit faster than the Radeon HD 6670 (OEM) in general. (explain)

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

Texel Rate

The Radeon HD 6770 is a lot (about 88%) faster with regards to texture filtering than the Radeon HD 6670 (OEM). (explain)

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

Pixel Rate

The Radeon HD 6770 should be a lot (more or less 125%) more effective at FSAA than the Radeon HD 6670 (OEM), and also should be able to handle higher resolutions more effectively. (explain)

Radeon HD 6770		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 largest amount of data (counted in MB per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number of 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 processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.