The multi-GPU regime has started with the advent of high-end machines capable of processing some enormous amounts of instructions per second thereby giving more life and credibility to 3D graphics which is related to game performance streaming video etc. However, if you are not inclined in buying a ready-made computer from a renowned brand but prefer to build a machine of your choice and preference then it is better to know the small but important things which make a difference in machine-performance. Take the GPU for an example. We have the giants like the AMD with Crossfire technology and Nvidia with the SLI technology for bridging more than one graphics card. For any computer help, you can talk to tech support service provider.

Let us consider a situation where you are using two Nvidia cards and one AMD card or vice versa. Here the coordination will not be at its best and although performance will not be reduced due to the usage of dissimilar chipsets but the optimum performance of three graphics card will not be extracted. It is because the odd mismatch out of the three graphics cards will be ignored for SLI bridging. Otherwise, driver installation in NVIDIA is easier and detects the graphics cards very quick in comparison to the AMD where one might be persuaded to install one graphics card at a time to get them detected. However this does not make them too inferior too Nvidia if benchmark test results are considered. The GPU cards have bridge connectors for connecting multiple cards and although the cards can be used without these connectors but if you do not want to put pressure on the PCI express slots then it is better to use them. It has been noticed that without the Crossfire connector the performance does fall quite a bit.

It would not be irrelevant to say that not all motherboards come with the same type of PCIe slots. Some come with PCIe x8 slots and others come with PCIe x16 slots but the difference in performance is not more than a few fames which is negligible if you use the PCIe x 8 instead of the PCIe x16.

I would also like to tell you about the drawbacks of using mixed GPU cards. Lets us say that you are using the same SLI configuration for Nvidia but the series is different for each of the three cards. Then the card closest to the CPU is taken to be the master and it is according to the clock speeds of this card that the other cards must work and if that is not possible then problems could arise. Also, the BIOS revisions for the cards might not match. The best option is always to use the same series of the same make. However if you ever choose to use mixed graphics cards then I would recommend a good combination for Crossfire--- HD(5830 + 5850 + 5870) would give you 165.1 frames per second if you are playing Alien Vs Predator(DX11), 121.9 frames per second for playing Avatar(DX10) and so in plain and simple terms that is an awesome performance which needs to be experienced to be believed because the numbers given above won't make the performance visible for you unless you actually start playing a resource hungry game or a movie.

CPU scaling or increasing the clock speeds of the CPU does not affect the performance too much if you are using AMD's Crossfire technology but with Nvidia's SLI technology it does make a difference if you consider a range between 190 x 14 MHz increased to 190 x 21 MHz as noticed while playing Avatar where the frames per second rose from 74.3 to 77.2. The advanced 3D aliasing methods do not let the CPU take the load but instead put it on the graphics card instead.