Radeon HD 4750 vs Radeon HD 6770

Intro

Compare those specs to the Radeon HD 6770, which features GPU core speed of 900 MHz, and 512 MB of GDDR5 memory running at 1050 MHz through a 128-bit bus. It also features 800 Stream Processors, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon HD 6770		108 Watts
	Difference: 33 Watts (44%)

Memory Bandwidth

In theory, the Radeon HD 6770 should be much faster than the Radeon HD 4750 in general. (explain)

Radeon HD 6770		67200 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 16000 (31%)

Texel Rate

The Radeon HD 6770 should be quite a bit (more or less 54%) better at texture filtering than the Radeon HD 4750. (explain)

Radeon HD 6770		36000 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 12640 (54%)

Pixel Rate

The Radeon HD 6770 should be much (about 23%) better at full screen anti-aliasing than the Radeon HD 4750, and will be able to handle higher screen resolutions more effectively. (explain)

Radeon HD 6770		14400 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 2720 (23%)

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 largest amount of information (counted in megabytes per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the card's clock speed. 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 many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.