cannot get my i5 2500k to run 4.5ghz what am i doing wrong??

SPOT ON mate Internal PLL Overvolatage changed it from disabled to Auto and system booted on 4.5ghz...

right i have a few questions..

1) what does Internal PLL Overvoltage do??? can it harm/damage the Sandycore 2500k CPU???

2) Im getting a quick DUAL BOOT upon switching on/restarting the machine now since i turned Invernal PLL Overvoltage on... what is causing this??? is this a bios bug??? or is this normal??

MANY thanks
 
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1) Perfectly safe so long as your vcore is within safe limits. A lot of SB's hit a wall at 4.5 and overvoltage it required to punch through it. For 4.5 you should just leave everything on auto except memory speed/timings/voltage and vcore.

2) May well be a bios bug with the z68 boards. I've never seen it on any p67.
 
OC to 4.6GHZ on 1.320V temps peaking at 63-65 on one core... thats as far as im taking it as i think i have reach my CPU limit taking everything into account temps etc... just need to ramp up my ram now and test 12 H prime and then IBT 10 passes or so... thank you for the advice guys only question i have now what on earth is that dual boot upon boot??
 
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OC to 4.6GHZ on 1.320V temps peaking at 63-65 on one core... thats as far as im taking it as i think i have reach my CPU limit taking everything into account temps etc... just need to ramp up my ram now and test 12 H prime and then IBT 10 passes or so... thank you for the advice guys only question i have now what on earth is that dual boot upon boot??


might be to late on this but any way
acording to asus over the phone the other day if you overclocking 4.5,4.6
and so on you need the PLL overvoltage enabled it's a protection
mine is on auto clock @ 4.6 did get it 4.7 but after an hour went down.
with the PLL overvoltage on you will find you get double post .asus say's it normal only takes a few moments.
but am happy @ 4.6 on auto,same mobo, 2500k
 
chillidog what voltages are you running to keep stable on 4.6ghz??? also is everything on auto including load line calibration... I prime 95 tested last night and after 8 hours thread 3 failed on 1.32V, so i put load line calibration on Exream setting and move volage up one notch... just testing now if i can get prime stable for 12h or so then i will be satisfied that my system is stable... ram is on 1333mhz as of yet at 1.5v

[EDIT] system seems more stable with load line calibration set to Extream.... states it reduces the effect of VDROOP

whats up with vdroop any way??? prime testing my voltages keep fluctiuating pretty bad...
 
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