You can plug it into the x16 slot. You can also plug x16 cards into open x1, x4 or x8 slots.
And you wont lose performance by plugging a x4 card into an x8/x16 slot.
thank you ShintaiDK, i also called owc tech support and made sure,i was almost ready to get a crosshairV board it has a x4 pcie slot......
that would have been a mess due to the phasechange unit attached to cpu....
ShintaiDK:
when the ssd.pcie gets here today friday im going to plug in, boot up to my other ssd sataIII drive goto disk managment ,storage then do a formatt on my new drive....
then restart with new os and i will do another formatt when i load the os....is this better fresh fresh install.......