LSI MegaRAID SATA 150-4 PCI card into X5DAL-TG2 PCI-X slot

Hello all,

I'm considering a LSI MegaRAID SATA 150-4 card, which the specs say
requires a 64-bit/66 MHz PCI bus.

I currently have an X5DAL-TG2 but the only 66 MHz PCI is taken.
However, it has a free 100 MHz PCI-X slot.

Can I plug the Standard PCI card into the PCI-X slot? I've pretty
much determines that that's OK, but my second is about the clock rate.
Will the 100 Mhz slow downshift to 66 Mhz, or will I run into
problems?

Thanks,

Rick Kunkel