Radeon HD 3650 vs Radeon HD 6770

Intro

Compare that to the Radeon HD 6770, which features a core clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also features a 128-bit bus, and uses a 40 nm design. It features 800 SPUs, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650		78 Watts
Radeon HD 6770		108 Watts
	Difference: 30 Watts (38%)

Memory Bandwidth

In theory, the Radeon HD 6770 should be a lot faster than the Radeon HD 3650 in general. (explain)

Radeon HD 6770		67200 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 41600 (163%)

Texel Rate

The Radeon HD 6770 is a lot (about 521%) faster with regards to texture filtering than the Radeon HD 3650. (explain)

Radeon HD 6770		36000 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 30200 (521%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6770 is the winner, by a large margin. (explain)

Radeon HD 6770		14400 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 11500 (397%)

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 transferred past the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 number is worked out by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.