Hi friends,

Want some advise on overclocking my AMD processor.

I am having some fun on my AMD sempron 140 unlock to 2 cores.

My specs :-
MSI 785GTM-E45
AMD Sempron 140 (Unlock to AMD Athlon II X2 4400e @ 1.380 vcore stock)
Corsair Dominator 2x1GB 1066MHz

My problem : Can't get past 4GHz to boot into Windows XP.

What I did so far :-
1.) Test my processor's maximum CPU FSB frequency. Found out 412 is the limit.

2.) Tried overclocking with highest multiplier 13.5 @ FSB 297 ~4GHz. Can POST successfully but do not want to boot into Windows. Anything lower than 4GHz can go into Windows. After that tried upping vcore step by step (almost reach 1.5), still do not boot into Windows XP. CPU-NB and HTT at the same frequency not more than 1800.

3) Lower the multiplier, increase the FSB. Once it hits 4GHz, can POST successfully but cannot boot into Windows XP. CPU-NB and HTT at the same frequency not more than 1800.

4.) Tried going over 4GHz (like ~4.1GHz, ~4.2GHz), can POST successfully but stubborn do not want to boot in Windows XP.

5.) Tried adjusting RAM timings, CPU-NB, HTT and voltages, still cannot boot into windows XP..

Additional information, Prime95 stable :-
1.) 14 hours FSB@296x13.5, Default vcore after unlocking: 1.380
2.) 12 hours FSB@319x12.5, Default vcore after unlocking: 1.380

Now I am stuck, want some advice where to tweak somemore to cross the 4GHz mark.

Any sifus out there, can advise? or did I reach the limit of this CPU?

This post has been edited by suhuann: Oct 5 2010, 03:04 PM

Thanks for replying bro.

Am using DDR2 1066MHz RAM, i have set it to 2.2V already.. not going to go any higher lol as the specs is 2.1V originally.. Am overclocking on an AM2+ motherboard..

highest OC is 3996MHz@1.380v that can load into Windows..
Higher than that cannot boot into windows but can POST normally/successfully. Heck I can even get to ~4.4GHz yesterday from BIOS but cannot boot into Windows XP. Feel like bashing the Windows already..

I tried upping the cpu volt & cpu-nb volts too.. it just stubborn don't want to boot into windows xp.. gah..

The main problem is cannot boot into Windows XP if my clockspeed is more than 4GHz.. I hope this is not one of the Windows XP limitation..

Any sifus, please advice

This post has been edited by suhuann: Oct 6 2010, 10:40 AM

Specs for my secondary rig :-
1.) MSI 785GTM-E45
2.) AMD Sempron 140 (Unlock to AMD Athlon II X2 4400e), cooled by Cocage MST-140 (Max temp during Prime95 is 45C, Idle 29C)
3.) Corsair Dominator 2x1GB 1066MHz DDR2

Anything else need to know?

My current RAM multiplier 1:1.66 sometimes 1:1.33, I try to keep my RAM MHz close to the specs. HTT and CPU-NB multiplier at x6, sometimes x5 if I go higher clockspeed.

I tried tighter RAM timings, cannot also. Tried looser RAM timings, cannot also.

My current max OC that CAN boot into Windows XP and do Prime 95 is as below :-
1.) 14 hours FSB@296x13.5, Default vcore after unlocking: 1.380
2.) 12 hours FSB@319x12.5, Default vcore after unlocking: 1.380

Thank you so much..

hmm, haven't tried 2.4GHz before, max i have done is 2.1GHz.. maybe I should try that..

vcore and cpu-nb voltage tried before..

If thats really the case, maybe thats the limit of the CPU unlock core then.. hahaha

Will let u know if it works out.. thanks!