What Mobo are you using?
What kind of RAM are you using?
Are both RAM chips the same kind?

More info please and we will be able to help you fully!

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Rig Specs: Custom Built:
ASUS M2N4-SLI
AMD Athlon 64 X2 Dual 4600+
512MB SLI NVIDIA GeForce 7950GT OC
2.00 GB Elixiur RAM
400GB Hitachi SATA II HDD
Western Digital 120GB IDE HDD
Samsung SyncMaster 932B Monitor
More to follow soon.....