Radeon HD 3650 512MB vs Radeon HD 7790

Intro

Compare those specs to the Radeon HD 7790, which comes with a core clock speed of 1000 MHz and a GDDR5 memory frequency of 1500 MHz. It also features a 128-bit memory bus, and uses a 28 nm design. It is made up of 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 512MB		78 Watts
Radeon HD 7790		85 Watts
	Difference: 7 Watts (9%)

Memory Bandwidth

The Radeon HD 7790 should in theory perform a lot faster than the Radeon HD 3650 512MB in general. (explain)

Radeon HD 7790		96000 MB/sec
Radeon HD 3650 512MB		25600 MB/sec
	Difference: 70400 (275%)

Texel Rate

The Radeon HD 7790 is a lot (more or less 866%) more effective at texture filtering than the Radeon HD 3650 512MB. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 3650 512MB		5800 Mtexels/sec
	Difference: 50200 (866%)

Pixel Rate

The Radeon HD 7790 is quite a bit (about 452%) faster with regards to FSAA than the Radeon HD 3650 512MB, and should be capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7790		16000 Mpixels/sec
Radeon HD 3650 512MB		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 largest amount of information (measured in MB per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher 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 in one second. This number is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The higher this number, the better the video 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 most pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - aka 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 of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.