Radeon HD 3650 256MB vs Radeon HD 6750 1GB

Intro

Compare that to the Radeon HD 6750 1GB, which makes use of a 40 nm design. AMD has clocked the core speed at 725 MHz. The GDDR5 RAM is set to run at a frequency of 1000 MHz on this particular card. It features 720 SPUs as well as 36 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 256MB		78 Watts
Radeon HD 6750 1GB		86 Watts
	Difference: 8 Watts (10%)

Memory Bandwidth

In theory, the Radeon HD 6750 1GB should be quite a bit faster than the Radeon HD 3650 256MB overall. (explain)

Radeon HD 6750 1GB		64000 MB/sec
Radeon HD 3650 256MB		25600 MB/sec
	Difference: 38400 (150%)

Texel Rate

The Radeon HD 6750 1GB is a lot (approximately 350%) more effective at AF than the Radeon HD 3650 256MB. (explain)

Radeon HD 6750 1GB		26100 Mtexels/sec
Radeon HD 3650 256MB		5800 Mtexels/sec
	Difference: 20300 (350%)

Pixel Rate

The Radeon HD 6750 1GB will be quite a bit (about 300%) faster with regards to anti-aliasing than the Radeon HD 3650 256MB, and capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 6750 1GB		11600 Mpixels/sec
Radeon HD 3650 256MB		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: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core clock speed. 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 fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.