Radeon HD 3650 256MB vs Radeon HD 7990

Intro

Compare those specs to the Radeon HD 7990, which features GPU clock speed of 950 MHz, and 3072 MB of GDDR5 memory set to run at 1500 MHz through a 384-bit bus. It also is comprised of 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3650 256MB		78 Watts
Radeon HD 7990		375 Watts
	Difference: 297 Watts (381%)

Memory Bandwidth

In theory, the Radeon HD 7990 should be 2150% quicker than the Radeon HD 3650 256MB in general, because of its higher bandwidth. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 3650 256MB		25600 MB/sec
	Difference: 550400 (2150%)

Texel Rate

The Radeon HD 7990 should be quite a bit (about 4093%) more effective at AF than the Radeon HD 3650 256MB. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 3650 256MB		5800 Mtexels/sec
	Difference: 237400 (4093%)

Pixel Rate

The Radeon HD 7990 is much (approximately 1997%) better at anti-aliasing than the Radeon HD 3650 256MB, and also capable of handling higher screen resolutions while still performing well. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 3650 256MB		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: Bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at 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 chip can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). 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.