Radeon HD 3650 vs Radeon HD 6770 1GB

Intro

Compare those specs to the Radeon HD 6770 1GB, which has a core clock speed of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It features 800 SPUs, 40 Texture Address Units, 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 1GB		108 Watts
	Difference: 30 Watts (38%)

Memory Bandwidth

Theoretically, the Radeon HD 6770 1GB should perform a lot faster than the Radeon HD 3650 in general. (explain)

Radeon HD 6770 1GB		67200 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 41600 (163%)

Texel Rate

The Radeon HD 6770 1GB is a lot (approximately 521%) better at anisotropic filtering than the Radeon HD 3650. (explain)

Radeon HD 6770 1GB		36000 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 30200 (521%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 6770 1GB is superior to the Radeon HD 3650, by a large margin. (explain)

Radeon HD 6770 1GB		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 maximum amount of information (measured in MB per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 applied per second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the graphics 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 number of pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out 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 drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.