How to overclock my x2 3800+ with K9N Ultra

My current rig as below:-
AMD X2 3800+ AM2 stock fan
MSI K9N Ultra (MS-7250 v2.0 but on board stated v2.1) bios upgraded from 3.2 to 3.5
1G DDR2 667 Kingston Value Ram x 2
MSI 8600GT-Overclock edition
Lite-on 20X Sata DVD-Ram
Seagate Sata2 320GB
WD Pata 120GB
Cooler Master 500W Extreme
Cooler Master Centurion 5
As I'd seen in many forums that a lots of people are able to archieve 2.4G~2.6GB easily but I don't know why I can only able to archieve highest at 2.3G only.
My current setting is as below:-
Multiplier - 10
HT - 230
HTT - 5X
FSB - 287.5
Ram divider - 533
Clock speed at 2300mHz stock vcore & vdimm 1.95
But the moment I try to increase the HT to 240 or higher it tends to be unstable even I increase the vcore and vdimm.
Can someone advise me on this matter.

Quote from: BOSSKILLER on 10-May-07, 12:03:37
"Besides that I'd also tried to set HTT to 3x and loosen the ram timing to 5-5-5-15-20 2T. vcore at 1.45 vdimm 2.0 and HT set to 240 but it won't boot."
try with lesser steps. give CPU vcore only when need. what is your actual memory frequency at latest good OCed settings?
"Btw I'd not seen the function "DOT & aggressive memory timings" where am I suppose to disable it?"
aggressive memory timings option doesn't exist in your BIOS, DOT(Dynamic Overclocking) its Disabled by default, but ensure it.(located in Cell Menu).
"My PCI-E has set to 104Mhz. Coz I'd seen some forum advise to set to 104Mhz. So actually 103Mhz or 104Mhz will be more stable?"
nop will be the same.
provide screenshots from CPU-Z with your last good known OCed settings.
I'd set to disable on dynamic overclock all the time. btw I'd upload the link CPU-Z validation but I don't know how to put attachment thats why I upload the link.

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