Can't get my 1.5GB PC3500 of memory over 215FBS?

Can't get my 1.5GB of memory over 215FBS? I have three sticks of Mushkin PC3500 Level 2 set at 2-2-2-11 and I've tried 2-2-2-5 with no change. I have the NF7-S 2.0 with no Volt mod. I have the memory maxed out at 2.9. Is it hard to get three sticks to OC? I wish this board could take 4.

What should I try?

Try each stick individually and see if you have a WEAK LINK.

They are suppossed to do 217, if it doesn't you can RMA it back to Mushkin--YES they still have some but only for RMA's