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MRAScott

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  1. MRAScott
    A whole 2 mV difference? Are you sure?
  2. MRAScott
    I'm going to have to do a lot of video encoding in the near future. I'll need an Ivy Bridge (8-thread) CPU. My plan is to implement one of the following; - de-lid the Ivy, then re-attach the IHS to the die and PCB with JB-weld, and use a closed-loop water-cooler. - de-lid the Ivy, then attach a closed-loop cooler directly to the die (no IHS), having attached a perfectly flat copper spacer to the cooler HS (probably also using JB-Weld). By "closed loop" water-cooler, I mean the likes of the Corsair "hydro series", which reside inside the case.
  3. MRAScott
    There is, absolutely, a benefit in using lighter-fuel. I speak from experience - lighter petrol disolves grease, and generally a far greater range of contaminants, much more quickly and easily than isopropyl. The isopropyl can then be used to mop up the petroleum, and whatever other residue is left. ETA >> Just noticed you mentioned "butane". I'm talking about petrol - the stuff you put in Zippo's
  4. MRAScott
    You're right - I had a brain-fart. I was thinking of the preparation of heatsinks - thermal/mechanical interfaces - not of electronics. But for the afore-mentioned (heatsinks and similar), the way to go is indeed lighter-petrol followed by isopropyl. Sorry for the mis-understanding.
  5. MRAScott
    Lighter petrol for cleaning heat-sink sufaces, not as a general cleaning agent for electrical contacts, I should clarify.
  6. MRAScott
    BTW - prior to using isopropyl, use lighter-petrol.
  7. MRAScott
    Funnily enough, I've had my DMM at the ready, set to 2000mV scale, but for the life of me I can't find where to measure Vcore on the P8Z77-V. Some Asus MB's have easily accessable, clearly marked measurement contacts, but not mine it might well be that I'd have to go to the back of the board, which would neccessitate taking it out of the case and 'breadboarding' it.
  8. MRAScott
    a few numbers to share; currently my machine, an Asus P8Z77-V / i5 2500K is @ 4.5 Ghz, Vcore offset +0.050V, LLC medium ("25%"). Constant full-load Vcore is 1.360 - 1.368V (both CPU-Z and Asus monitor). Starting apps from idle, CPU-Z reports brief Vcore of 1.392V. I don't ever want to see peaks going over that voltage with my i5 2500K, which is specified to run @ c.1.20V at it's standard clock of 3.3 GHz. Remember; these high-voltage "events" are whenever ANY application is started, which for me (and most people) will be TENS of 1000's of times a year. Volts are like water-pressure - enough pressure, enough times, and a pipe will burst.
  9. MRAScott
  10. MRAScott
    You may well be absolutely correct, I'm simply speculating about this (not actually making claims) on the basis of a couple of oddities I and others have experienced (with 67/68/77 intel chipsets and sandy/ivy bridge CPU's). BTW, I was spurred to search around a bit more, and some apparently solved the issue (with neg offset vcore and LLC) by changing various 'C state' settings, which I gather are concerned with power saving.
  11. MRAScott
    Perhaps. But the implication would be that the added cost of the VRM's (and the HS's used on them, sometimes even heat-pipe) on high-end MB's serve absolutely no purpose at all, except to sell higher-priced 'premium' product. But anyway, isn't a more stable voltage/current capability precisely what stable overclocking (or underclocking/undervolting, for that matter) requires? Whatever, coincidentally or not, the no-load/load-to-idle freezing/BSOD issue with negative offset vcore overclocks (1155 socket) was something that seemed to affect particular MB's, and IIRC they were 'budget' or mid-range editions,
  12. MRAScott
    Hi - informative stuff, thank you. My experience with an i5 2500K on an Asus P8Z77-V are similar to yours. My i5 2500K has 'average' overclocking abilities - the voltage it requires (actual) rises pretty steeply above 4.2GHz, and the P8Z77-V's VRM is (IIRC) only 8-phase, the Pro and Deluxe versions are 12 and 16 respectively, which would doubtlessly allow similar overclockng at lower vcore. [ETA >> the P8Z77-V actually has a 12-phase VRM, I now know. Pro and Deluxe are both 16-phase]. One caveat with using 'high' or above LLC settings, though; one can end up with well under 1.0V vcore at idle, which can cause lock-ups or BSOD's when the machine is, er, idling. I've experienced this myself, despite the machine being overnight stable with Prime95 (or any other stress test) at 4.4Ghz with vcore at load (again, actual) of 1.34V. I currently use medium LLC and a +ve CPU voltage offset of 0.020V, previously I was using a negative offset of 0.010V and high LCC ('high' appears to add another 0.04V at load compared to the medium setting), but idle voltage would sometimes drop below 0.9v and I had a couple of BSOD's when Windows (7 Pro 64) was loading, or when the PC was just clocking down from a stress test. cheers, Mark.
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