Radeon HD 3650 vs Radeon HD 7790

Intro

Compare that to the Radeon HD 7790, which comes with a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 memory running at 1500 MHz through a 128-bit bus. It also features 896 SPUs, 56 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 7790		85 Watts
	Difference: 7 Watts (9%)

Memory Bandwidth

The Radeon HD 7790, in theory, should perform much faster than the Radeon HD 3650 in general. (explain)

Radeon HD 7790		96000 MB/sec
Radeon HD 3650		25600 MB/sec
	Difference: 70400 (275%)

Texel Rate

The Radeon HD 7790 will be a lot (more or less 866%) better at AF than the Radeon HD 3650. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 3650		5800 Mtexels/sec
	Difference: 50200 (866%)

Pixel Rate

The Radeon HD 7790 is quite a bit (about 452%) faster with regards to full screen anti-aliasing than the Radeon HD 3650, and also should be capable of handling higher resolutions more effectively. (explain)

Radeon HD 7790		16000 Mpixels/sec
Radeon HD 3650		2900 Mpixels/sec
	Difference: 13100 (452%)

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 (counted in megabytes per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better 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 are processed per second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.