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Sandy Bridge 2700K multiplier drops on Prime95

post #1 of 13
Thread Starter 
Hi guys,

got myself a little problem and figured u could help me.
i searched the OCN forum but could'nt find a thread about this one, the one i found was over a year old so i started a new one

i'm running a 2700K SB on a MSI P67A - GD65. i got my system quite easily stable at 4.6 Ghz with real nice temps but i wanted a bit more, so i clocked it at 4.9 Ghz.

now here is the problem i have;

under no stress Cpu-Z says it runs at 4.9 Ghz

338

if i run Prime95 it drops my multiplier by 1. from x49 to x48

338

if i let it run for another minute is drops again

338

it goes backup to x48 but never to x49.

what happens? and why does it do this ? mad.gif

if this is a really stupid question, then pardon me for i am a N00B.

my vCore is set to 1.380

btw; why is my FSB not 100 ?

thanks in advance !
Edited by MesonyX - 3/6/12 at 5:01pm
post #2 of 13
try disabling Spread Spectrum and that should lock you bus speed to 100. The reason as to why it's throttling could be down to temperature or turbo power limits. Temperatures look okay to me, so that leave the power limit, try setting the Short Duration Power Limit- 250 & Long Duration Power Limit - 250 and see where that gets you.

Report back and let us know smile.gif
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post #3 of 13
Thread Starter 
thanks for the reply

i'll give it a go and get back to you !
post #4 of 13
maybe you wanna disable thermal management or thermal throttling or whatev its called in your bios. if enabled, when the temp gets high, the multiplier decreases as not to fry your precious cpu.
   
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post #5 of 13
You're going to be fine as soon as you change the Short and Long power duration wattage. It will no longer limit your Multiplier based on the amount of watts your CPU is requiring. Don't mess with thermal throttling as there's absolutely no need to! I just got my 2500k on an ASRock Extreme3 Gen3 stable at 5 Ghz at 1.465V with 77 as a max temp!

Good Luck, Nick
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post #6 of 13
Thread Starter 
as u all can see i'm kinda new to all this but ehh.... where can i adjust my short and long term power wattage ?

i disabled speedspectrum and it works, thanks for that but can't find were to change the wattage....

if it has anything to do with Intel Turbo boost, i disabled it
Edited by MesonyX - 3/7/12 at 3:03am
post #7 of 13
Hmm your on an MSI board let me grab a look at an MSI bios page and I'll get back to you!

Nick
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Lenovo Y510P
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post #8 of 13
Alright you want to go under CPU Settings and turn Overspeed protection to disabled and then you will get Long and Short duration power limit, set both to 250 leave the time at 1000 ms. You should be fixed and good to go!

Nick
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post #9 of 13
to get 100 bus speed on msi mobo you have to enable internal pll overvoltage, disable spread spectrum, and disable overspeed protection and for ocing problem it could be the bios try reflashing to older bios cause i have the p67a g43 it when i try to oc to 5ghz it will go down like that to 4.6 with the newest bios
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post #10 of 13
Thread Starter 
Quote:
Originally Posted by -tPg- HeadShot View Post

Alright you want to go under CPU Settings and turn Overspeed protection to disabled and then you will get Long and Short duration power limit, set both to 250 leave the time at 1000 ms. You should be fixed and good to go!
Nick

Thanks for the trouble !

Im at work right now, when i'll get back home i will give it another go.
I'm currently running prime with the multiplier set to 48x and the core to 1.380 to see what it does, if it stil runs after 12 hours i will go a bit further and maybe try to reach the magical 5
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