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Hi Unless your Mobo has either a 710 or a 750 southbridge you will not be able to unlock extra cores (even if the CPU was capable) as you need ACC and it is only available on the quoted southbridges. Stransky

Hi I have tried all sorts of Volts on CPU and NB/HT to no avail with the 720 and also the 555. I even tried with 4Gb of 1066 Ram at loose timings to see if that would help and also 800 but still no joy. I don't really need to run 4 core but I wanted to see if the chips would unlock having read...

Hi I have the same Mobo as you (see signature) and, while my CPU will not unlock to anything other than a x2 I am bery happy with it. I had it running at 4.18Ghz but it would not remain stable when gaming i.e Crysis, Far Cry2, COD MW2. So I had to drop to 3.9Ghz and no problems so far. Stransky

Hi I have a 2nd Rig with a 720BE on a ASUS M4A785D-M Pro (DDR2) which will not unlock the 4th Core at all, not matter what Vcore I use or what NB. I also tried it on 2 other Mobos (MSI 770T-C45 and my current Gigabyte MA770-UD3) and no luck with them either. Stepping is CACZC AC 0907BPMW. I...

Hi My current clock. Can't unlock extra cores no matter what I try volts wise. Tried on 3 different Mobos, current 1 and a MSI 770T-C45 and a ASUS M4A785D-M Pro. OldBarzo

Thanks BTW as far as I know there is a new BIOS on the Asus site for this series to update for x6 (it actually states that this is so on the d/l screen). I also have a x3 720BE which will not unlock the 4th Core just re-boot at any attempt. Stransky

Hi What stepping have you got on your 555. I have a 555BE on a Gigabyte GA MA770-UD3 but it will not unlock (CACAC AC 1004BPMW). I also tried it on an Asus M4A785D-M Pro and it would not unlock on it either. Stransky