Radeon HD 4750 vs Radeon HD 6950 2GB

Intro

Compare all of that to the Radeon HD 6950 2GB, which uses a 40 nm design. AMD has clocked the core frequency at 800 MHz. The GDDR5 RAM works at a speed of 1250 MHz on this specific card. It features 1408 SPUs as well as 88 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon HD 6950 2GB		200 Watts
	Difference: 125 Watts (167%)

Memory Bandwidth

The Radeon HD 6950 2GB should theoretically be much faster than the Radeon HD 4750 in general. (explain)

Radeon HD 6950 2GB		160000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 108800 (213%)

Texel Rate

The Radeon HD 6950 2GB is a lot (approximately 201%) better at texture filtering than the Radeon HD 4750. (explain)

Radeon HD 6950 2GB		70400 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 47040 (201%)

Pixel Rate

The Radeon HD 6950 2GB should be a lot (about 119%) faster with regards to AA than the Radeon HD 4750, and should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 6950 2GB		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 (in units of MB per second) that can be moved over the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 once 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units of the card by the core 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 in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount 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 output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.