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25 Jun 2011  
Microsoft MVP

Windows 7 Ultimate X64 SP1

Yes you have one set at CAS 8 (new) and the old at CAS 9. the system will try to run all RAM at the lowest speed/CAS and may be causing conflicts.

Of course the new RAM may have one bad stick too. Run memtest on each stick and then with all installed. If you get errors, even one, Take sticks out one at a time and re-run the tests.
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