Radeon HD 3650 vs Radeon HD 6790

Intro

Compare those specifications to the Radeon HD 6790, which has core speeds of 840 MHz on the GPU, and 1050 MHz on the 1024 MB of GDDR5 memory. It features 800 SPUs along with 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650		78 Watts
Radeon HD 6790		150 Watts
	Difference: 72 Watts (92%)

Memory Bandwidth

The Radeon HD 6790, in theory, should perform quite a bit faster than the Radeon HD 3650 in general. (explain)

Radeon HD 6790		134400 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 108800 (425%)

Texel Rate

The Radeon HD 6790 is a lot (more or less 479%) faster with regards to anisotropic filtering than the Radeon HD 3650. (explain)

Radeon HD 6790		33600 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 27800 (479%)

Pixel Rate

The Radeon HD 6790 should be much (about 363%) faster with regards to FSAA than the Radeon HD 3650, and also should be able to handle higher resolutions more effectively. (explain)

Radeon HD 6790		13440 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 10540 (363%)

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 data (measured in MB per second) that can be transported past the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the card's clock speed. 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 get to the maximum fill rate.