Radeon HD 3650 vs Radeon HD 6950

Intro

Compare all of that to the Radeon HD 6950, which has GPU clock speed of 800 MHz, and 1024 MB of GDDR5 memory running at 1250 MHz through a 256-bit bus. It also is made up of 1408 SPUs, 88 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650		78 Watts
Radeon HD 6950		200 Watts
	Difference: 122 Watts (156%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6950 should theoretically be quite a bit superior to the Radeon HD 3650 overall. (explain)

Radeon HD 6950		160000 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 134400 (525%)

Texel Rate

The Radeon HD 6950 should be much (more or less 1114%) faster with regards to AF than the Radeon HD 3650. (explain)

Radeon HD 6950		70400 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 64600 (1114%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 6950 is superior to the Radeon HD 3650, and very much so. (explain)

Radeon HD 6950		25600 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 22700 (783%)

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 maximum amount of data (in units of MB per second) that can be transported past the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is worked out 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 filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.