@johnkeates:
@VAMike:
Do you actually mean PCI slots or do you mean PCIe slots? Actual (ancient) multiport PCI cards will burn through any possible energy savings on the CPU side.
He means PCI-X, not PCI or PCIe. But in the PCI-X case, also power burns all.
PCI-X is dead, so he won't find that. My thought was that someone might be trying to reuse an ancient quad port card (even if it were PCI-X that spec was backward compatible with PCI so that might work even if it performed horribly). Or (hopefully) someone is just using the wrong term for a PCIe port.
There were, once upon a time, PCI-X to PCIe bridges, but that's firmly in "just don't do that" territory.