Radeon HD 4750 vs Radeon HD 6950

Intro

Compare those specifications to the Radeon HD 6950, which features a clock frequency of 800 MHz and a GDDR5 memory frequency of 1250 MHz. It also uses a 256-bit bus, and makes use of a 40 nm design. It features 1408 SPUs, 88 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon HD 6950		200 Watts
	Difference: 125 Watts (167%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6950 is 213% quicker than the Radeon HD 4750 in general, because of its higher data rate. (explain)

Radeon HD 6950		160000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 108800 (213%)

Texel Rate

The Radeon HD 6950 should be a lot (more or less 201%) faster with regards to texture filtering than the Radeon HD 4750. (explain)

Radeon HD 6950		70400 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 47040 (201%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6950 is superior to the Radeon HD 4750, by far. (explain)

Radeon HD 6950		25600 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 13920 (119%)

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 max amount of data (counted in MB per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better 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 are processed per second. This number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, 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 maximum amount of pixels that the graphics card can possibly record to its local memory in one 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 drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.