Radeon HD 4670 512MB vs Radeon HD 6770 1GB

Intro

Compare all that to the Radeon HD 6770 1GB, which has GPU core speed of 900 MHz, and 1024 MB of GDDR5 RAM running at 1050 MHz through a 128-bit bus. It also features 800 Stream Processors, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 512MB		70 Watts
Radeon HD 6770 1GB		108 Watts
	Difference: 38 Watts (54%)

Memory Bandwidth

In theory, the Radeon HD 6770 1GB is 110% quicker than the Radeon HD 4670 512MB overall, because of its higher bandwidth. (explain)

Radeon HD 6770 1GB		67200 MB/sec
Radeon HD 4670 512MB		32000 MB/sec
	Difference: 35200 (110%)

Texel Rate

The Radeon HD 6770 1GB will be a lot (more or less 50%) faster with regards to anisotropic filtering than the Radeon HD 4670 512MB. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon HD 4670 512MB		24000 Mtexels/sec
	Difference: 12000 (50%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6770 1GB is superior to the Radeon HD 4670 512MB, by far. (explain)

Radeon HD 6770 1GB		14400 Mpixels/sec
Radeon HD 4670 512MB		6000 Mpixels/sec
	Difference: 8400 (140%)

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 data (counted in megabytes per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the card's interface width by its memory speed. In the case of DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better 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 number of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the clock 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 is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.