Radeon HD 3650 vs Radeon HD 6450 (OEM) 1GB

Intro

Compare those specifications to the Radeon HD 6450 (OEM) 1GB, which comes with a core clock frequency of 750 MHz and a GDDR5 memory frequency of 900 MHz. It also uses a 64-bit bus, and makes use of a 40 nm design. It features 160 SPUs, 8 Texture Address Units, and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 1GB		31 Watts
Radeon HD 3650		78 Watts
	Difference: 47 Watts (152%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 6450 (OEM) 1GB will be 13% quicker than the Radeon HD 3650 overall, because of its greater data rate. (explain)

Radeon HD 6450 (OEM) 1GB		28800 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 3200 (13%)

Texel Rate

The Radeon HD 6450 (OEM) 1GB will be a bit (more or less 3%) better at texture filtering than the Radeon HD 3650. (explain)

Radeon HD 6450 (OEM) 1GB		6000 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 200 (3%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 6450 (OEM) 1GB is a better choice, not by a very large margin though. (explain)

Radeon HD 6450 (OEM) 1GB		3000 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 100 (3%)

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 information (in units of MB per second) that can be transferred across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once 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, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs 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 also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.