500w Thermaltake: Newegg.com - Thermaltake TR2 W0379RU 500W ATX 12V v2.2 Power Supply
Apparently the Radeon 4870 has a 225w TDP, and the Phenom II x6 1055t has a 125w TDP.
Also, I have the same issue at below stock volts/frequency. This leads me to believe it is not a power issue.
Perhaps an issue with the motherboard not able to supply power, but not the power supply.
Maybe I'm wrong.
EDIT: My original suspicion was that it was a power supply issue. The TDP of the items installed that are sucking power don't exceed 500w, or even 450w, but just to err on the side of caution I am buying a new 750w PSU this Friday instead of a motherboard. I think that my overclock may have been limited by the Power supply more than the motherboard, although this board is clearly not ready to power this Phenom II x6.
Perhaps I can disable 2 of the cores on this chip and get a LinX run out of it. I'll go try that.
So it's stable at stock settings with the last 2 cores disabled. Is this the motherboard or the Power supply?
If I had to guess I'd say it's the power supply. This motherboard may not be much of an overclocker, but the **** thing is advertised as supporting Phenom II x6 and it wasn't stable in LinX.
This leads me to believe that, assuming my motherboard manufacturer isn't completely full of ****, my PSU can't handle the load.
Just FYI I overclocked it to 3.5ghz 1.425vcore @ 4 cores and the system shut itself off at 37s.
Any thoughts? I'm buying a Corsair TX750 this friday instead of a new motherboard. That way I can get a nice Asus Crosshair IV Formula board in 2 weeks, and at least have a stable 6-core setup until then.
That's my theory at least....... I hope I'm right..
EDIT #3: Just thinking to myself. If the motherboard was unable to power this chip with "clean" enough power for stable operation, wouldn't it just have instability issues? The whole "*Click* off" shutdown thing makes me believe this is a PSU failsafe mechanism for over power and it attests to the quality of the power supply, even if it's a little weak...
...Once again I hope I'm right..
EDIT #4: I have decided my remedy for this situation.
I have 4gigs of Crucial Ballistix DDR2 that I just bought and don't want to waste.
This board looks to be a decent overclocker, it accommodates the Phenom II x6 1055t, and it will save me money. Instead of buying the Crosshair IV Formula board + memory, I can just buy this one and keep my ram as well as save nearly $200.
I'm buying a Corsair tx750 this friday, and the Asus Crosshair II Formula board 2 weeks later.
**** I might even buy an 8800gt for hybrid PhysX at the same time. :P