Radeon HD 3650 vs Radeon HD 6790

Intro

Compare those specs to the Radeon HD 6790, which features GPU clock speed of 840 MHz, and 1024 MB of GDDR5 memory set to run at 1050 MHz through a 256-bit bus. It also is comprised of 800 Stream Processors, 40 Texture Address Units, and 16 Raster Operation 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

In theory, the Radeon HD 6790 should be much 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 should be quite a bit (more or less 479%) faster with regards to texture filtering than the Radeon HD 3650. (explain)

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

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6790 is superior to the Radeon HD 3650, and very much so. (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: Bandwidth is the largest amount of data (measured in MB per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total texture units by the core 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the the core 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 quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.