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Pastimes : Dream Machine ( Build your own PC )

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To: Zeuspaul who wrote (211)	2/14/1998 4:58:00 AM
From: Dirk Hente	Read Replies (2) of 14778

[pci slot limit, pci load & multimon gc] speaking of a dream machine, zeuspaul, how about a dual pentium II + 9 PCI slot mobo : supermicro.com currently i am trying to figure out what the limiting factors for the number of pci slots are. today i found an interesting piece of info form a usenet search: > >Info from the PCI spec: > - Approximately ten electrical loads per PCI bus > This is the limiting factor. Loads are as follows > 1) Bridge Chip > 2) 4 sockets (yes the connectors count as a load) > 3) 4 boards plugged into the connectors > 4) 1 PCI to ISA bridge chip > 5) * Some designes do not count the bridge chip so they > > have 5 slots someone commented: > some cards take more than 2 loads each > (100mb network cards seem to be a good example). It's possible to only be > able to handle 3 cards depending on the integrated peripherals. this is quite interesting.... maybe a multimon display card ( though fitting into one slot) is representing more than '2 loads' as well. this means when you plug-in your appian card (or whatever) you may overload the pci bus when 3 (or 4) other pci cards are present. BTW, the number of IRQs is not the limiting factor, because of IRQ sharing

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