Radeon HD 4770 vs Radeon HD 6950

Intro

Compare that to the Radeon HD 6950, which features core clock speeds of 800 MHz on the GPU, and 1250 MHz on the 1024 MB of GDDR5 memory. It features 1408 SPUs as well as 88 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770		80 Watts
Radeon HD 6950		200 Watts
	Difference: 120 Watts (150%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6950 is 213% quicker than the Radeon HD 4770 overall, due to its higher data rate. (explain)

Radeon HD 6950		160000 MB/sec
Radeon HD 4770		51200 MB/sec
	Difference: 108800 (213%)

Texel Rate

The Radeon HD 6950 will be quite a bit (more or less 193%) better at texture filtering than the Radeon HD 4770. (explain)

Radeon HD 6950		70400 Mtexels/sec
Radeon HD 4770		24000 Mtexels/sec
	Difference: 46400 (193%)

Pixel Rate

The Radeon HD 6950 will be a lot (about 113%) more effective at anti-aliasing than the Radeon HD 4770, and also will be able to handle higher resolutions more effectively. (explain)

Radeon HD 6950		25600 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 13600 (113%)

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 data (counted in MB per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better 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 texture map elements (texels) that can be processed per second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.