Radeon HD 3650 vs Radeon HD 6750 1GB

Intro

Compare that to the Radeon HD 6750 1GB, which features GPU core speed of 725 MHz, and 1024 MB of GDDR5 RAM set to run at 1000 MHz through a 128-bit bus. It also features 720 SPUs, 36 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 6750 1GB		86 Watts
	Difference: 8 Watts (10%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6750 1GB should perform much faster than the Radeon HD 3650 overall. (explain)

Radeon HD 6750 1GB		64000 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 38400 (150%)

Texel Rate

The Radeon HD 6750 1GB will be a lot (more or less 350%) faster with regards to anisotropic filtering than the Radeon HD 3650. (explain)

Radeon HD 6750 1GB		26100 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 20300 (350%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6750 1GB is the winner, by a large margin. (explain)

Radeon HD 6750 1GB		11600 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 8700 (300%)

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 (measured in MB per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

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