When your Intel Just does not want anymore Vcore... I hate that!

[oRIDDLERo]

Scenario:
You have a real nice overclock, it is dual prime stable for 24+ hours. You burn it in for a week or so at a moderate voltage. Your Core temp is great; your 12v rail is solid as a rock. You decide its time for a little jump (100mhx or so) and jump up the voltage .02 or so. System is no longer with dual prime at all. WTF lol. You back down to the core speed that was just 24hour DPS, and at the increced voltage it is not DPS at all. I hate THIS. It happened to me with my last 3.0c and now with my 3.2DO.

Conclusion:
It seems Intel CPUS have an “Ambient cooling or above voltage limit” (does not apply to sub zero cooling methods) at which the CPU decides what the max vcore it will take is, and anything above this limit will cause errors even at a clock that is 100% stable at just a little less voltage.

Note:
After a few months of folding my old 3.0c gave me a free 150mhz boost 24hr DPS at the same exact vcore. I hope this chip follows the same pattern for a 4200+ O/C. *uck it I’m keeping Dual primes on all damn week (They been goin since I got pissed last night for about 19 hours or so at 4015). Maybe that will whip this into shape

3.2DO Prescott Reference voltages:
3.2DO Prescott @ 4015mhz 1.56v 24hour DPS
3.2DO Prescott @ 4100mhz 1.59v DPS error out in 5min
3.2DO Prescott @ 4015mhz 1.59v DPS error out in 10min

[mcnbns]

Overclocking is a fickle thing. I feel your pain, Riddler.

[saaya]

u sure its not heat? where do you read your temps from? and even if the temps are reading ok, some parts of the cpu just get much hotter than the probe reads... the double pumped alus for example..

[oRIDDLERo]

Def not heat... My probe is thermal epoxied about .5cm from the edge of the Intel IHS so i think the reading is as accurate as its going to get. Core onver DP load nevr goes above 40c

[Revv23]

yeah my 2.8c does 3.85 prime 1.725v with 36c temps (according to crap IC7 temp chip) but at 1.75 38c it wont do 3.9 or 3.85 for that matter, im setting up watercooling in hopes of that happy 4 ghz...

[mr_knowitall15]

same thing here. rock freaking solid at 4.01@1.46 Vcore, cant even boot into windows at a mere 150mhz or so increase, even at 1.61 VCore!!!! i want a socket T mobo and 6xx series cpu so bad!!!!! *will take donations*

[oRIDDLERo]

same thing here. rock freaking solid at 4.01@1.46 Vcore, cant even boot into windows at a mere 150mhz or so increase, even at 1.61 VCore!!!! i want a socket T mobo and 6xx series cpu so bad!!!!! *will take donations*

You max3 cannot suppy that voltage. Its fets are only rated to 75A you are very lucky it is so stable as it is on that board. If you break out a DMM and have a look at your core you can confirm... I used to have a maxIII

[Revv23]

yeah im thinking 4ghz is a limit of the mobo's and not so much a voltge thing...


edit - not really meaning 4ghz, but it seem this is where many 478 setups top out, even with cpu's that go very far on low volts, then cant get any further with really high volts...

ex: my 2.8c does 3.65 at 1.6, but wont do 3.9 even at 1.75.

[go_go]

my 2.8c dose 3.85 at 1.66v but no boot at 1.7v

[jimborae]

My 2.4c is rock solid at 3.3g @ 1.5v but wont boot at this speed on anything over 1.6v