Radeon HD 3650 512MB vs Radeon HD 7850

Intro

Compare that to the Radeon HD 7850, which uses a 28 nm design. AMD has clocked the core speed at 860 MHz. The GDDR5 memory runs at a speed of 1200 MHz on this specific model. It features 1024 SPUs as well as 64 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 512MB		78 Watts
Radeon HD 7850		130 Watts
	Difference: 52 Watts (67%)

Memory Bandwidth

In theory, the Radeon HD 7850 is 500% faster than the Radeon HD 3650 512MB overall, because of its greater data rate. (explain)

Radeon HD 7850		153600 MB/sec
Radeon HD 3650 512MB		25600 MB/sec
	Difference: 128000 (500%)

Texel Rate

The Radeon HD 7850 will be quite a bit (more or less 849%) faster with regards to texture filtering than the Radeon HD 3650 512MB. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon HD 3650 512MB		5800 Mtexels/sec
	Difference: 49240 (849%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7850 is the winner, by far. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 3650 512MB		2900 Mpixels/sec
	Difference: 24620 (849%)

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 (measured in MB per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, it must be multiplied by 2 once 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, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. 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 potential to reach the max fill rate.