i7 + HT = fail :(

jambus

jambus

jambus

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Joined
15 Jan 2008
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420
Location
Petersfield, UK
Hey guys. Wondered what you would make of this. Got my i7 cooled on water and am trying to get 3.2 Ghz with Hyperthreading... easy doors right? The batch no is 3839A (which I haven't heard any horror stories for). Anyway, with a VCore set in the Bios of 1.275V, CPU-Z reads the Vcore on idle as 1.24V (a loss of 0.35Volts) and under load it drops to 1.2 Volts... my first question I suppose is, is that a drop to indicate a problem with my PSU or CPU? I'm not sure what sort of droop people see on the i7 processors. Anyway, thought 1.2V should be ok for 3.2 Ghz, so I ran 4 instances of Orthos and set the programme affinity in task manager to spread the load across all cores. One of the orthos instances failed after 17 minutes... joy. Anyway, I upped the Vcore to 1.3 Volts in the bios, under load this dropped to 1.235 Volts which I thought must be fine for 3.2 GHz with HT enabled, again, apparently not, one of the instances of Orthos failed again after 47 minutes. So I turned HT off and the overclock was stable for 5 hours... ?!|?! what the hell :() is my hyperthreading bust or something? I don't really have much experience with this i7 and I'm not finding it too easy to overclock this thing, just wondering if you guys think firstly, if there is a PSU or CPU problem from the droop I'm getting between Bios VCore and the realtime Vcore reading and secondly, if you think the chip is broken, not being able to handle Hyperthreading? Anyway, thanks in advance for any help with this guys =D
 
Just thought I'd add, if it helps, that my computer is 100% stable in everything else, doesn't have a problem running games for hours on end etc. it's just Orthos that fails. I also tried prime in these two settings, it also failed.
 
What are your mem, Uclk and QPI frequencies and voltages?

I have to have the mem voltage at 1.64v and the uclk and qpi frequencies turned down to clock my i7. With those set it does 4.0ghz with HT and speedstep on without any problems at all.
 
Memory is at 1.64 with the QPI around half a volt lower than the VCore, so set to around 1.225Volts when the VCore is 1.275 and the QPI at around 1.25V when the VCore is 1.3 Volts
 
If you are running you mem at 800mhz and a voltage of 1.64 then most XMP profiles require a QPI voltage of 1.35v

What is your motherboard and what are your QPI/uclk frequencies. Unless you lower them you are unlikely to get to far OC.

Try the OC sticky on the Asus P6T deluxe forum.
 
jambus said:
Just thought I'd add, if it helps, that my computer is 100% stable in everything else, doesn't have a problem running games for hours on end etc. it's just Orthos that fails
Click to expand...

so it's stable enough then, isn't it?
 
oh yeh, it's stable enough :) It's just... an inconvenience that a stress test is saying somethings wrong if you get me ^^ I'll give some different QPI settings a go. My motherboard is a Gigabyte UD4P and I've put the QPI multi as low as it will go though and I'm not too sure what the uclk is...
 
Also, just want to know, what sort of VDroop are you guys getting on your X58 boards with a 920? I'm starting to wonder if I have a PSU or Motherboard problem, as I can't accurately set a VCore because I'm getting so much VDroop :(
 
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