Just wasting time at work today looking at motherboards on the internet. I noticed that all the Nforce4 socket 939 PCI-express motherboards have just one PCI-express x16 slot for graphics cards, two PCI-express x1 slots and a few regular PCI slots?? So, how does the Nvidia SLI thing work if you only have one graphics slot? are the x1 slots used for this? does this mean it's slower than AGP 8x? I was under the impression that SLI cards were linked using a small bridge, therefore would need to be placed next to each other but the pictures of the boards I have seen show the x16 slot (I think) on its own? Are there two types of PCI-express motherboards perhaps? SLI compatible and non-SLI??? AMD Athlon XP2200+ Aero7 lite 512mb Crucial pc2700 Abit NF7-s V2.0 80GB Seagate SATA 120GB Seagate SATA Geforce4 Ti4200 128mb Benq FP767-12 17" 12ms SB Audigy 2 ZS

"Are there two types of PCI-express motherboards perhaps? SLI compatible and non-SLI???" Exactly. The SLI board will have two PCI-E x16 slots Asus A7N8X-X 1800+ @ 8 x 210MHz 512MB PC3200 Asus Ti4800SE 128MB WinME/WinXP Pro

True that there is mobo's that have two 16x slots but when you actually run in sli mode they only run 8x each do to bandwidth limitations of the chipset. Check out the link below for such a board. http://www.compu-terra.com/store/product1877.html If you want to run true double 16x mode you need to spend about 450$ american on a tyan board that is capable of the additional bandwidth because that board (dont remeber model) has 2 northbridge chips and two southbridge chips, hence the extra bandwidth. O ya did i mention its also made for dual opterons : ) Have the lambs stopped crying Clarice?