Radeon HD 3650 512MB vs Radeon HD 7990

Intro

Compare those specs to the Radeon HD 7990, which comes with GPU clock speed of 950 MHz, and 3072 MB of GDDR5 memory running at 1500 MHz through a 384-bit bus. It also is made up of 2048 SPUs, 128 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 512MB		78 Watts
Radeon HD 7990		375 Watts
	Difference: 297 Watts (381%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7990 should theoretically be much superior to the Radeon HD 3650 512MB in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 3650 512MB		25600 MB/sec
	Difference: 550400 (2150%)

Texel Rate

The Radeon HD 7990 should be much (approximately 4093%) more effective at anisotropic filtering than the Radeon HD 3650 512MB. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 3650 512MB		5800 Mtexels/sec
	Difference: 237400 (4093%)

Pixel Rate

The Radeon HD 7990 is quite a bit (more or less 1997%) more effective at anti-aliasing than the Radeon HD 3650 512MB, and able to handle higher resolutions more effectively. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 3650 512MB		2900 Mpixels/sec
	Difference: 57900 (1997%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in MB per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.