Radeon HD 5670 vs Radeon HD 6770 1GB

Intro

Compare all of that to the Radeon HD 6770 1GB, which has core speeds of 900 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. 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 5670		61 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 47 Watts (77%)

Memory Bandwidth

In theory, the Radeon HD 6770 1GB should be 5% quicker than the Radeon HD 5670 overall, because of its greater data rate. (explain)

Radeon HD 6770 1GB		67200 MB/sec
Radeon HD 5670		64000 MB/sec
	Difference: 3200 (5%)

Texel Rate

The Radeon HD 6770 1GB will be much (about 132%) better at AF than the Radeon HD 5670. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon HD 5670		15500 Mtexels/sec
	Difference: 20500 (132%)

Pixel Rate

The Radeon HD 6770 1GB should be a lot (more or less 132%) more effective at full screen anti-aliasing than the Radeon HD 5670, and also should be capable of handling higher screen resolutions better. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
Radeon HD 5670		6200 Mpixels/sec
	Difference: 8200 (132%)

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 (counted in MB per second) that can be transferred over the external memory interface in a second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out 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 quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.