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Blown overclock after memory upgrade, now what?

post #1 of 15
Thread Starter 
Hey guys,

Ive been runing the system in my sig for a few years now for my rendering / animation / CAD / gaming rig; and until recently - its served me very well. A few recent projects, however, have cause me to run out of memory (yes...all 12GB) so I elected to pick up a new matched set of Dominator 24GB DHX


I installed the new memory it in to the system this morning, and the system wouldnt post. After a few tries, it finally came back around but only because the BIOS auto-reset itself back to stock speeds.

Clearly I was fine, even conservatively cool with 3.8 and 12gb doms at 1600, so it seems to me that it was the 24gb upgrade that caused me the problems, nothing about the processor or cooling seems weak. Removing the overclock and memtesting the new 24gb memory at stock 1600 while the 920 was set to its default "auto-everything" settings went fine - so I dont think its faulty memory

so....
Q) What settings in my bios should I be looking in to get my overclock back givent he above points?
Q) do the normal "overclocking-guides" associated with overclocking the 920 still apply when I am talking about 24gb of memory?


I am a fair-weather hobbiest with this stuff and really dont know about about all of the bios settings to be sure where to go next; so your help is greatly appreciated.


Thanks in advance guys!
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post #2 of 15
Thread Starter 
oh yeah, here is a link to a post I created a while back when trying to get my original overclock in pace - just in case something here is relevant to the new challenge

http://www.overclock.net/intel-cpus/...-920-asus.html
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post #3 of 15
Did you have 3x4GB memory sticks before and now you have 6x4GB? If that's the case, your overclocking ability suffers greatly with all slots being used.
     
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post #4 of 15
I'd look at the timings, but not just the "advertised" ones (CL-tRCD-tRP-tRAS CR). I just doubled the RAM on my sig rig with a set of similar RAM (had 2 XMS3 dual ch, and added 2 sets of a quad ch kit, also XMS3, but differnt versions/batch), and one timing was different between the two. That timing made my PC unstable. If i recall correctly, the timing was the tRFC, at least how CPU-Z reports it. The dual ch kit has a value of 108, and the quad has a value of 78. I averaged those to 91, and OC back to stable
Edited by Starbomba - 4/30/11 at 2:22pm
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post #5 of 15
I found that populating all memory slots requires more qpi voltage and possibly higher imc voltage I am populating all slots and running 4.45 ( 12GB ) the extra 12GB could be stressing the imc more and as such may require a bump in voltage to the imc core and possibly imc io
post #6 of 15
Thread Starter 
THanks for the replies guys.
Just to clarifify, the first set of dims that I had were 6 x 2gb. The new set is obviously 6 x 4gb. Does that change anything about the stresses on the board?
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Core i7 920 [D0] ASUS P6T Deluxe V2 EVGA GeForce GTX 275 1792MB CORSAIR DOMINATOR 12GB 
Hard DriveOSMonitorKeyboard
Corsaid C300 128 SSD Win 7 - 64 bit 30" Dell + (2) 21's in portrait Logitech G15 
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post #7 of 15
it dos some but not a whole lot. the imc still had to run harder than with only 3 slots, but not as hard as having to access so much memory
post #8 of 15
Thread Starter 
well knock on wood but I disabled all of the spectrum features, C1e, and EIST and forced Load LIne Calibration to "enabled", then I added a bit of juice to the Vcore (its at something like 1.22 now; used to be 1.20) and it passed a quick prime test of about 6 hours; so there is hope. Temperatures hover around 80C with a closed case, the room mesures around 26C (79F) on a typical day; so its a little warmer than I would like.

While playing BF2BC last night - i had two system freezes where the sound turned in to what I can only descibe as a nine inch nails remix; which then required a forces reset. I couldnt make out anything useful int he system log but I would imagine that to be video related right?
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Core i7 920 [D0] ASUS P6T Deluxe V2 EVGA GeForce GTX 275 1792MB CORSAIR DOMINATOR 12GB 
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Corsaid C300 128 SSD Win 7 - 64 bit 30" Dell + (2) 21's in portrait Logitech G15 
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CORSAIR CMPSU-850TX COOLER MASTER Cosmos Logitech Mx518 
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CPUMotherboardGraphicsRAM
Core i7 920 [D0] ASUS P6T Deluxe V2 EVGA GeForce GTX 275 1792MB CORSAIR DOMINATOR 12GB 
Hard DriveOSMonitorKeyboard
Corsaid C300 128 SSD Win 7 - 64 bit 30" Dell + (2) 21's in portrait Logitech G15 
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post #9 of 15
that is still an unstable oc you are getting further though. spread spectrum should be disabled when oc'ing. i think the avg voltage for 3.8ghz is about 1.25v on the 920. hoever increasing other volatges can all you to lower vcore. I am curious what your vtt/qpi, imc, ioh core, ioh io are set to
post #10 of 15
Just throw voltage at it until it behaves. Or accept a lower overclock.
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