Radeon HD 3650 vs Radeon HD 7990

Intro

Compare all of that to the Radeon HD 7990, which features core speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 RAM. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

In theory, the Radeon HD 7990 is 2150% quicker than the Radeon HD 3650 overall, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 7990 should be quite a bit (approximately 4093%) better at AF than the Radeon HD 3650. (explain)

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

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7990 is superior to the Radeon HD 3650, and very much so. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 3650		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 max amount of information (in units of MB per second) that can be transported over the external memory interface in a second. It's calculated by multiplying the bus width by the speed of its memory. In the case of DDR type RAM, 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs 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 fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.