Think this is stable enough?

Nic Miller · 8 Nov 2011 at 23:34

Passed all 20 runs on ibt

Running custom based on amount of free ram is producing a similar number of gflops but at slightly quicker time. Similar temps. Gonna consider my oc ibt stable unless anyone says no! Now to get prime blend to work for 12 hours - that's for another day!

Davefran · 8 Nov 2011 at 23:41

Nic Miller said:
Passed all 20 runs on ibt

Running custom based on amount of free ram is producing a similar number of gflops but at slightly quicker time. Similar temps. Gonna consider my oc ibt stable unless anyone says no! Now to get prime blend to work for 12 hours - that's for another day!

Screenshots ???

Nic Miller · 9 Nov 2011 at 01:22

dunno how to do screenshots!

Plec · 9 Nov 2011 at 09:23

Nic Miller said:
dunno how to do screenshots!

Alt + PrtScn and then paste into your favourite paint app and crop/edit etc if required.

Plec · 9 Nov 2011 at 09:26

Nic Miller said:
Well I switched on pc this evening and went to sort out a new user account for the mrs and get a bsod out the blue! Not even being stressed!

Have you considered al least testing it at 4.4GHz at 1.32V as it's very possible that a drop of 100MHz would rid yourself of the random BSOD and you'll be in your voltage comfort zone?

You really wont notice any discernible difference between 4.4GHz and 4.5GHz and if you can get 4.4GHz stable (after a couple of weeks usage) then you could then think about trying for 4.5GHz again.

Nic Miller said:
and set the timings manually as it was showing it as 11-11-11-28-1n - which is clearly wrong. Dram was previously set to auto. Could these dram issues be the prob?

Now running ibt on maximum, 4 threads and 20 runs - stable through 11 runs. 133.238s and 123.4391 gflops - core temp max

Maybe if you've set it up incorrectly - could you confirm what the memroy tab in CPUz is now reading now that you've set the memory manually?

Nic Miller · 10 Nov 2011 at 08:40

I haven't set the mem up incorrectly - it was on auto but shoeing the wrong timings in the bios and CPU-z - now I have set it manually it is all correct.

Anyway - have finished my quest for 4.6ghz as follows:

Ibt - 20 passes with no errors at 123 gflops (84% utilisation) temp max 63
Prime95 - 12 hour blend test rounding check enabled - max temp 57
Crysis - good long session - max temp 44

That's with the following:
I5 2500k 3.3ghz @4.6ghz
Asrock z68 extreme4 gen3
Vcore - 1.34v
Dram - 1.5v
Speedstep disabled
Core power max 225

Now, think I can safely go higher?!

Cheers for all your help!

Plec · 10 Nov 2011 at 11:23

Nic Miller said:
Cheers for all your help!

No problem - glad i could help.

Nic Miller said:
Now, think I can safely go higher?!

It may be a possible but you'll need to run with it at 4.6GHz for a minimum of 2 weeks just to ensure it's stable in day to day use. It's still not proved itself 'everyday stable' and that takes time i'm afraid.

If it doesn't present any problem over that time and you feel you want the challenge of a higher clock then go for it. But even an extra 100MHz may cost you a mighty amount of voltage -as anything over 4.5/4.6GHz usually requires a considerable juice bump and sometimes the trade off isn't worth it. But sometimes it's interesting to see how high your chip can go and then drop it back to sensible Ghz after - certainly no harm in experimenting...

Good luck with it.