Radeon HD 5770 vs Radeon HD 7950 3GB

Intro

Compare those specs to the Radeon HD 7950 3GB, which uses a 28 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 RAM runs at a frequency of 1250 MHz on this model. It features 1792 SPUs as well as 112 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770		108 Watts
Radeon HD 7950 3GB		200 Watts
	Difference: 92 Watts (85%)

Memory Bandwidth

In theory, the Radeon HD 7950 3GB should be 213% faster than the Radeon HD 5770 overall, because of its higher bandwidth. (explain)

Radeon HD 7950 3GB		240000 MB/sec
Radeon HD 5770		76800 MB/sec
	Difference: 163200 (213%)

Texel Rate

The Radeon HD 7950 3GB should be quite a bit (about 164%) better at anisotropic filtering than the Radeon HD 5770. (explain)

Radeon HD 7950 3GB		89600 Mtexels/sec
Radeon HD 5770		34000 Mtexels/sec
	Difference: 55600 (164%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7950 3GB is superior to the Radeon HD 5770, and very much so. (explain)

Radeon HD 7950 3GB		25600 Mpixels/sec
Radeon HD 5770		13600 Mpixels/sec
	Difference: 12000 (88%)

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 transferred over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total 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 processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs 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 output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.