Radeon HD 3650 vs Radeon HD 7850

Intro

Compare those specs to the Radeon HD 7850, which features GPU clock speed of 860 MHz, and 2048 MB of GDDR5 memory set to run at 1200 MHz through a 256-bit bus. It also is made up of 1024 SPUs, 64 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

In theory, the Radeon HD 7850 should be quite a bit faster than the Radeon HD 3650 overall. (explain)

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

Texel Rate

The Radeon HD 7850 should be a lot (approximately 849%) better at AF than the Radeon HD 3650. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon HD 3650		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 a better choice, by far. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 3650		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 largest amount of information (counted in MB per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This number is worked out by multiplying the total number of 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 processed in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many 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.