I am currently trying to overclock my Phenom II X3 720 BE processor and I have it 'stable' at 3.6 GHz and the CPU Vcore at 1.475 V. What I mean by the quotes is that when I run wPrime for 10 minutes, it runs fine, but when I play a game like Civilization 5 for a couple of hours I get a 0x124 BSOD. Civ 5 makes my CPU run at about 60-80% usage continuously, by the way.
I have seen other people overclocking this processor at my current setup fine (Source) but when I try to use this setup, it obviously fails after a while. Should I try raising my CPU Vcore a little? Or should I try raising my north bridge voltage and/or frequency?
What is your psu ?
Error 0x124 is ussualy not enough power / voltage cpu, you need ran at 4hour minimal use prime95. Or use intelburn test 20x at memory high/maximum. if in the test you get bsod .. Try raise voltage cpu.
Some cases it caused by bad psu, if ran at fulload game rail+12v psu will drop. It cause your system hungry power.
My PSU is a 600W Cooler Master Silent Pro M600 Series. So it is definitely supplying enough power to my parts. I'm not really sure I want to raise my Vcore more than 1.475, that is already pretty high.
A lot of older revision Phenoms hit a wall around 3.5GHz, I couldn't make mine hit 3.6 until I put 1.53v into it. I'd stick to 3.4-3.5ish, you can try upping the "FSB" to get a bit more out of it, but I wouldn't hope for more.
I'd go for 3.4-3.5 and a 2400-2600MHz northbridge.
The answer to your wprime stability vs game instability is that a voltage bump, may be a lot, can stabilise the OC. I can run my CPU at 1.125V stable for prime95, IBT and OCCT, but crashes when playing PoP:2008. A voltage bump to 1.175V is needed in my case.