Radeon HD 3650 256MB vs Radeon HD 7790

Intro

Compare that to the Radeon HD 7790, which makes use of a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM is set to run at a speed of 1500 MHz on this specific card. It features 896 SPUs as well as 56 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 256MB		78 Watts
Radeon HD 7790		85 Watts
	Difference: 7 Watts (9%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7790 will be 275% faster than the Radeon HD 3650 256MB in general, because of its higher bandwidth. (explain)

Radeon HD 7790		96000 MB/sec
Radeon HD 3650 256MB		25600 MB/sec
	Difference: 70400 (275%)

Texel Rate

The Radeon HD 7790 should be much (approximately 866%) more effective at AF than the Radeon HD 3650 256MB. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 3650 256MB		5800 Mtexels/sec
	Difference: 50200 (866%)

Pixel Rate

The Radeon HD 7790 is a lot (more or less 452%) more effective at AA than the Radeon HD 3650 256MB, and also should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7790		16000 Mpixels/sec
Radeon HD 3650 256MB		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 max amount of information (measured in MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The better 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 amount of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.