i5 760 overclock giving me headache!

cr!spy · 6 Jan 2011 at 16:15

Fitted my i5 760 I got for xmas last weekend, seemed to overclock really easily, all I did was reset my Gigabyte H55M-UD2H back to defaults then went into bios and set the bclk to 181 and left the multiplier on 21 then put the vcore up to 1.25 and it had been running rock solid till today. All I done today was tightened up the screws on the heatsink and when I turned it back on it came up with the failed overclock screen. Now it wont overclock passed 3GHz! What is going on?

eyetrip · 7 Jan 2011 at 09:50

What heatstink is this?

Am not familiar with a great many of the hatsinks around and so havng difficulty imagining which require screwing in.

1Day · 7 Jan 2011 at 10:11

You might have over tightened your heat-sink.

Release some of the tension but do see what your temps are both before and after.

dazzerd · 7 Jan 2011 at 12:19

1Day said:
You might have over tightened your heat-sink.

Release some of the tension but do see what your temps are both before and after.

+1 this has happened to me in the past and took me ages to figure out. loosen them half a turn.

cr!spy · 7 Jan 2011 at 14:12

Awesome! That sorted it thanks guys!

cr!spy · 7 Jan 2011 at 14:36

I've loosened it a bit more than before and it's dropped my temps more than 5 degrees! One thing though is there an option in the bios that automatically raises the multiplier as it's set to 21 but cpuz is saying 22?

Sgt Tackleberry · 7 Jan 2011 at 14:43

Hand tight works best

eyetrip · 7 Jan 2011 at 15:27

cr!spy said:
I've loosened it a bit more than before and it's dropped my temps more than 5 degrees! One thing though is there an option in the bios that automatically raises the multiplier as it's set to 21 but cpuz is saying 22?

Turbo boost will be enabled in bios, which gives an "extra" multiplier when all four cores used. the multiplier could go higher when only one core is loaded.

cr!spy · 7 Jan 2011 at 15:50

Ok I'll disable it then, thanks. Any other CPU features that should be disabled?

DragonQ · 7 Jan 2011 at 15:54

Why disable it if it's stable. 181 BLCK gives you 3.8 GHz on 2-4 loaded cores and 4 GHz on a single loaded core.

cr!spy · 7 Jan 2011 at 16:26

So your saying 3.8 would be faster than 4ghz?

DragonQ · 7 Jan 2011 at 16:50

What? If you disable it you only get 3.8 GHz even with only one core loaded. I'm pretty sure you can't set a 22x multiplier manually to apply to all cores.

cr!spy · 7 Jan 2011 at 17:20

Sorry I missed read your post. Well I'm testing it at 200 x 20 at the moment - with turbo boost disabled.

Mick-1965 · 7 Jan 2011 at 17:32

DragonQ said:
I'm pretty sure you can't set a 22x multiplier manually to apply to all cores.

22 multi is usable for all cores. Well it is is on my boggo P7P55d, so shouldn't see why it wouldn't be on others.

cr!spy · 7 Jan 2011 at 19:57

What are acceptable load temps for these i5 760's? Mine reached 79 degrees on a quick intel burn test @ 4ghz 1.25v.

Mick-1965 · 8 Jan 2011 at 01:07

Not sure I should comment.
I know many run allot higher, but I run the same chip @ 4.2 (21x200) with 1.35v set in bios, it hits 63c with 40 runs of IBT on max and that's getting close to my comfortable limits. Its water cooled fair enough, but yours going above 70~75 with only a quick IBT IMO is asking for trouble.
As said many will probably say its fine. But at least give it a 20 run on IBT on max. to see what your temps really rise to.

cr!spy · 8 Jan 2011 at 15:16

Yeah think I might start again and re-apply the paste and heatsink better to try and lower my temps.

Invertigo · 8 Jan 2011 at 17:05

As said above, let it run for a good while to measure temps. With the lynnfield architecture, you ideally want to stay below 75-80 degrees (though they are safe up to 99 degrees, which is their tjmax point when thermal throttling kicks in). Just remember nothing will stress your cpu like IBT in day to day usage.

jamesfreddie · 16 Jan 2011 at 15:25

What overclock have you got now.