Radeon HD 4750 vs Radeon HD 6950 2GB

Intro

Compare all that to the Radeon HD 6950 2GB, which features a clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It features 1408 SPUs, 88 Texture Address Units, 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 2GB		200 Watts
	Difference: 125 Watts (167%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6950 2GB should theoretically be quite a bit superior to the Radeon HD 4750 overall. (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 (more or less 201%) better at anisotropic 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 much (approximately 119%) better at anti-aliasing than the Radeon HD 4750, and capable of handling higher 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: Bandwidth is the max amount of information (measured in megabytes per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. 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 number of texture map elements (texels) that are applied per second. This is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.