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Well, best bang for buck is definitely UD5 here. You cannot really get anything better for £120. I would get one myself if I was to build 1156 system now. I see you are looking for offers from other retailers thus I'm not sure what to recommend you. It depends on your current and future expectations for a mobo.
Any pro overclocker care to comment on Load Line Calibration? Is it better to use it or not use it?
I am using it and prime95 failed after 3 hours at 1.29vcore and I am now priming with 1.3vcore at 4ghz (both with LLL on, I realise the vcore would be about 1.45v without).
Stuck LLC to [Standard] and still (Short term testing) stable @ 4 GHz.
Lower volts (1.28v ~ 1.3v) means lower temps, Average around mid sixties in a heated room.
Cheers for that wee tip, Most reviews i read said to use LLC.
Well, best bang for buck is definitely UD5 here. You cannot really get anything better for £120. I would get one myself if I was to build 1156 system now. I see you are looking for offers from other retailers thus I'm not sure what to recommend you. It depends on your current and future expectations for a mobo.
What VTT voltage do you guys put in?
1.10 fails stress test.
Auto is ok.
Help
UD5 it is then
Will go and have a read now! Offers from other retailers? I only buy from Ocuk?
Thanks though
Friend has the P55-UD5 and I have the P55A-UD3R. Both very good boards and whichever is chosen won't dissapoint. The UD5 really is rammed with features.
Any pro overclocker care to comment on Load Line Calibration? Is it better to use it or not use it?
I am using it and prime95 failed after 3 hours at 1.29vcore and I am now priming with 1.3vcore at 4ghz (both with LLL on, I realise the vcore would be about 1.45v without).
I am also hearing a lot on motherboard voltages. I have my ram at the rated voltage and I have set my own cpu voltage, however everything else is on auto. I have overclocked in the past but this is my first i5 overclock attempt.
Any pointers much appreciated
EDIT: I am most interested in QPI/VTT voltage, PCH Core voltage and CPU PLL voltage. I will leave the DRAM Termination voltagfe at auto as I don't intend to clock the ram past its rated 1600mhz.
I have US3L motherboard and Zalman Extreme
Stable now at 4 ghz
Vcore 1.264
VTT 1.15
Ram 1.64
Max temps 64 degrees. Really happy
Load line calibration all disabled.
VTT on auto was stable, but someone said it was dangerous. Then tried 1.10 and it failed.
I passed IBT v2.4 with 1.3v and LLL enabled with VTT on auto. I set VTT to 1.21v and it failed IBT after 12 passes on maximum (which to me seems very very close to stable).http://forums.overclockers.co.uk/showpost.php?p=16194325&postcount=571
I'd say PCH and PLL left on auto or just above the stock till you meet some serious problems overclocking with core voltage tweaks. This won't probably happen by reaching 3.8GHz or so. PLL 1.89V and PCH 1.1V are safe afaik. They are related to PCI-E controller and NB connection iirc.
Keep temps below 75-80*C and you should not encounter any problems It's mostly a safety margin for warmer ambient temps.
EDIT
It would be nice if you could provide some feedback on what voltage increases you needed for specific clocks. Eg. 3.5GHz for stock volts (1.2V), then 1.25V for 3.7GHz, etc.
Don't worry mate, I'm just countering the same problem, 1.21V seems too low for stable overclocks over 3.8GHz with reasonably low v-cores. Yeah, try upping the v-core till 1.35V, report what you achieved. If it fails, go back to 1.3V and try 3.8GHz (20x190) with 1.21V on VTT.
Yeah, there aren't many people who seem to be aware of potential dangers carried by uncore voltage of Lynnfield higher than 1.21V... It's the same with overvolting the memory controller over 1.65V.
Auto is bad, it may set it up as high as 1.35V - maximum absolute voltage for VTT acc. to Intel is 1.21V. Have a read through my post here - http://forums.overclockers.co.uk/showpost.php?p=16194325&postcount=571.
I'd say let it be 1.21V and check if it fails 20 loops of IBT as I said earlier.
I didn't mean to insult you in any way tweakinfreak, I think everyone has a right to search for the best offers that suit them. The only reason I said that earlier was because I noticed the RAM you speced earlier wasn't listed in OcUK but appeared with the exact name on the competition's site. I assumed you would get the rest of your rig from there too. In fact I bought half of my rig there simply because it worked out better for me.
Oh no problem mate, none taken, I brought it off MM but alas it's no good so trying to cancel the deal and get some more suitable RAM for my overclocks
Sorry guys for my confusion, my VTT was always on lol
My turbo thing is the one i have off.
Stable Clock 4 ghz 200X20 vcore 1.264
VTT 1.15 (1.10 was not stable and auto was)
Ram OCZ 1.64 volts
This has been stable overnight with prime95, temps at 64 degrees.
Will try IBT this afternoon and report back.
What settings i run IBT and how many loops?
Thx