Radeon HD 3650 512MB vs Radeon HD 6790

Intro

Compare those specs to the Radeon HD 6790, which features a GPU core 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 made up of 800 SPUs, 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 512MB		78 Watts
Radeon HD 6790		150 Watts
	Difference: 72 Watts (92%)

Memory Bandwidth

Performance-wise, the Radeon HD 6790 should theoretically be a lot superior to the Radeon HD 3650 512MB overall. (explain)

Radeon HD 6790		134400 MB/sec
Radeon HD 3650 512MB		25600 MB/sec
	Difference: 108800 (425%)

Texel Rate

The Radeon HD 6790 is quite a bit (about 479%) faster with regards to texture filtering than the Radeon HD 3650 512MB. (explain)

Radeon HD 6790		33600 Mtexels/sec
Radeon HD 3650 512MB		5800 Mtexels/sec
	Difference: 27800 (479%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 6790 is superior to the Radeon HD 3650 512MB, by far. (explain)

Radeon HD 6790		13440 Mpixels/sec
Radeon HD 3650 512MB		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 maximum amount of data (measured in megabytes per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, 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 texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the card will be at 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 a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the core 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 fill rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.