**Official DFI LanParty UT 790FX-M2R Review/Overclock/Guide Thread**

[justapost]

Oh, nice going there.

Im having a little more succes clocking the Phenom now.

Last night I primed 13.5x200 at 1.35Vcore and everything else stock.

It BSOD'd after about 5 hours I think if I read the Prime95 log correctly.

Very pissed and disappointed I clocked the NB to 2.2Ghz, decreased Vcore to 1.3375V and threw Vnb upto 1.3375V too. It's still running after 8 hours.

So I can only imagine a few things here, if this proves to be stable. Heat does indeed have an effect on stability, Vnb might be better 1:1 with Vcore and NB should be clocked higher too.

No clue which of ther above arguments are true but thus far it works.

Could it maybe be, since at xHTT and ymultiplier, the total Mhz switched a few decimals (according to CPU-Z at least), the NB speeds goes sometimes maybe by a very small margin below HT speed? I dont know if it's possible, but if that's the case it might explain a few crashes/freezes. I dont feel like testing if it's true, maybe later on, but atm Im trying to get the best out of it.

Also, did anyone get some good HTT speeds yet on M2R and Phenom B3?

Hi Rammsteiner,
Thank you for the update.
I have this issue you have at 2.8GHz at 2.9GHz. Alot more stability with a higher NB speed.
I'm still in the process of verification. I have found the minimal vcore and vcorenb required for 2.8Ghz/2.0GHz.
At those settings I had one prime95 failure. I ran CoreDamage parallel to prime95 and upped the temps to ~70°C and it failed after a fe minutes.
I reran it at those higher temps and it was stable for about an hour again.
At 60°C this setup primed fine for 22,5hrs. I don't want to inspect this temperature issue right now. My aim is finding the lowest stable voltages for different NB speeds at 2.8GHz.

I use the following procedure for stability testing.

1. Sandra Memory Latency (that triggers a freeze here very quickly)
2. CoreDamage for a few minutes to see what temps i will get
3. Prime95 together with 3dmark06, to generate a very high power consumption
4. Prime95 longtest
5. So called WISE testing (Surfing, Openoffice, Antivir) for a while.


Lowest voltages for 2.8Ghz/2.0Ghz
CPU-VID: 1,3125V (Bios) 1,351V (DMM)
NB-VID: 1,15V (Bios) 1,144V (DMM)
CPU-TEMP: 63°C coredamage, 60°C max prime95
Pime Time: 22hrs

Lowest voltages for 2.8Ghz/2.2Ghz

Same setup as before, 2,2GHz NB speed starting with 1,275V NB-VID.

First results, with CPU temps at 63°-64°C (max, coredamage) 25°C ambient.
1,275V: passed 1-3, skipped 4-5
1,225V: passed 1-2, prime95 failed after 3min
1,25V: passed 1-3, primed for 1hr
1,2375V: passed 1-3, primed for 1:15hrs
1,23125: passed 1-3, prime95 failed after 12min
1,2375V: passed 1-3, prime95 failed after 1hr
1.24375V: passed 1-3, prime95 failed after 4:34hrs
1,25V: passed 1-3, prime95 stable for 12hrs