This really depends on how effective your cooler is, as your Asus mobo should be up to the task:
First raise vcore to 1.5volts total. (1.56v is mine atm.)
Raise your RAM voltage an additional 0.2 volts. (ie. 1.8v STD 2.0v o/c)
Boot pc make sure temps are still good
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Restart to Bios again, this time raise the FSB in increments of 5 Mhz followed by a restart and a 'Orthos' 10 min run. Again watch the temps.
Repeat until unstable then back off 1Mhz at a time till Orthos has no errors.
Your RAM should be fine at a 1:1 ratio, and your Asus mobo should be ok with the HT at x5 (Normal/Auto). If not:
- Raise your northbridge voltage the minimum you can (ie. my mobo min increment is 0.1v with both Northbridge and HT) and same with HT voltage.
- Ram would just need the 'Ratio' changed or 800 to 667Mhz or lower depending on mobo. If that doesn't work maybe loosening timings from 5-5-5 to 6-6-6 (CAS - RAS to CAS - RAS) or (tCL-tRCD-tRP) again depending on your bios.
Taking into account my FSB is only 228Mhz this is a fairly quick stable overclock.
Now your CPU is overclocked try tightening the RAM timings, if you've been able to leave them alone to get achived O/C
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Hope this quick guide helps you daredevil01.