Radeon HD 4750 vs Radeon HD 6770

Intro

Compare those specifications to the Radeon HD 6770, which has GPU clock speed of 900 MHz, and 512 MB of GDDR5 RAM set to run 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

As far as performance goes, the Radeon HD 6770 should in theory be a lot better than the Radeon HD 4750 overall. (explain)

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

Texel Rate

The Radeon HD 6770 should be a lot (about 54%) faster with regards to anisotropic 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 is a lot (more or less 23%) better at FSAA than the Radeon HD 4750, and also able to handle higher resolutions better. (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 maximum amount of information (counted in megabytes per second) that can be transported across the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at 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 could possibly write to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.