Radeon HD 3650 vs Radeon HD 6790

Intro

Compare all of that to the Radeon HD 6790, which has GPU core speed of 840 MHz, and 1024 MB of GDDR5 RAM running at 1050 MHz through a 256-bit bus. It also is comprised of 800 SPUs, 40 TAUs, and 16 ROPs.

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

As far as performance goes, the Radeon HD 6790 should theoretically be much superior to 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 will be quite a bit (about 479%) more effective at AF 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 a lot (more or less 363%) faster with regards to anti-aliasing than the Radeon HD 3650, and will 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 max amount of data (measured in MB per second) that can be transported past the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, 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 that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.