After much reading and testing I am here to report that the Athlon II X3 435 CPU I bought seems to be unstable when unlocked with the ASUS M4A79XTD-EVO Motherboard.
- Latest bios (2102) was installed.
- Unlock looked promising reporting X4 with L3 cache in Bios.
- Unfortunately any attempt to get past "Grub" causes reboot - including attempting to run Windows Memory Test - flash of screen then reboot - which was the quickest test cycle I could think of.
- Tried vcore up to 1.5
- Then tried vcpu up to 1.4
Guess I just wasn't lucky - but I'm willing to try more and different settings if someone has a suggestion.
Reset back to X3 and overclocked using "Overclock Profile +10%" and that seems pretty stable with high CPU temps of ~50c. I expect there is more power to be had but I'm not really much of an overclocker and really wouldn't know where to start or what to change. I expect will also need a better CPU cooler if I drive it much harder.
It may seem odd to have an expensive MB and a cheap processor but I was left holding the MB and some good GSkill memory. Seemed pointless to have $200 worth of kit lying around doing nothing so dusted off an old case and bought the Athlon II X3 435 for $72. I thought I might get lucky with a stable unlock - guess not.
I'll pick a 1090T when I have free cash and/or they drop in price.
Cheers ... Phil Usher