Originally posted by: HuddaDudda I think I am getting a bit confused on that. SLI is PCIE right - please help set me straight on that. AM I MIXING THEM UP!? I dont have dual monitors now (maybe in the future) so not a big deal - would like the possiblity if I did want another one I could but no biggie there. I did get the LG 8ms monitor too I posted. Its nice. Let me know!
Just to be absolutely unambiguous:
PCIE (PCI Express) is a bus design, like PCI and AGP. It provides a new way to connect add-on boards such as graphics cards, network cards, hard disk controllers etc. to your motherboard.
SLi is chipset logic on a motherboard that allows the power of two graphics cards to be harnessed to perform certain kinds of processing more quickly than is possible with a single graphics card. It so happens that SLi has been developed in such a way that it works only with graphics cards connected to a PCI Express bus.
This means:
1. SLi is running two SLi-capable graphics cards (nvidia only) on a motherboard that is SLi-capable (nvidia only). It is said the two cards must be identical (same chipset, same manufacturer) but I am not sure if this is strictly true. Some motherboards have two PCI Express slots for graphics cards and yet are not SLi capable - this is basically because this allows nvidia to carve up the market and charge a premium for those who want the SLi feature.
2. If you have an SLi-capable motherboard, there is nothing stopping you from just running one graphics card. This will not operate in "SLi mode" - for that you need two graphics cards.
3. High-end systems such as the one you are proposing can run modern games at 1280x1024 with all the eye-candy turned on (anti-aliasing etc.) at good frame rates with only a single graphics card such as an nvidia 6800 Ultra.
4. A single modern graphics card is capable of running two separate monitors on its own. However, some cards have two DVI connectors, whereas some have one DVI connector and one HD15-pin connector. DVI connectors are preferable when using LCD monitors. With more cards, you can run more monitors although you can't just slap any old cards in and hope everything will work out - you need to make sure your configuration is supported. If running four monitors in an SLi system, you will have to disable SLi mode and just use them as independent cards.
OK, I'll shut up now, this is getting more complicated than I wanted it to be.