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BLK/FSB frequency questions ugrent help

post #1 of 7
Thread Starter 
it might be a noobie question guys but pls bear me

i got a Phenom II X4 965 n i manage to clock it at 4.2Ghz just by raising the multiplier now i wanna got higher but no mater wat i do it wont clock over 4.2 Ghz

i read n have heard a lot that if we have to get the max oc out of a cpu you have to sometimes increase the fsb instead of the multiplier

here is were i got a question i have decreased the multiplier down to 10x n wanna find the max FSB i can hit but do i have to increase the vcore even if i decrease the multiplier ??
which other voltage has to be tweaked to increase the stability of the clock as far as i know the CPU/NB n the NB voltage gives a little stability but when should i add it ???
post #2 of 7
4.2 Ghz on a Phenom II is already pretty much at the limit for most chips. You can attempt to start overclocking the CPU-NB and raising the CPU-NB voltage. Both of those things can help stabilize a high CPU overclock (sometimes).
post #3 of 7
So, as far as the CPU thinks about things, reference clock and multiplier are basically irrelevant. Since clock speed == ref clock X multiplier, you can OC two ways. The first is with the ref clock and stock multiplier, and then the second is with the multiplier. Either way, its just clock speed in the end and so you'll have to adjust vcore either way you do it. And yes, increasing the CPU-NB voltage can help stabilize a PhII chip to some degree. Just don't expect miracles with it. I add it personally after I've already messed with vcore, as generally you're already getting close to your max OC, and that is one more little thing to adjust that could help stabilize it.

As far as I know, I've never heard about CPU's having a different max speed if you OC with different methods. Therefore, the only thing that makes sense, is this. If you OC with the stock ref clock and adjust multiplier, you only get OC's that in 100MHz increments. If you are stable at 4.2GHz, and not at 4.3MHz, there is no way of knowing if the chip is stable at 4.25GHz unless you also start using the ref clock.

Does that make sense?

And OCin the northbridge is worth real performance with the PhII's. Somewhere around 5-10% at the same clock speed. See if you can get it up close to 3GHz (most were 2600-2800MHz though).

Good luck smile.gif.
post #4 of 7
Thread Starter 
thanx logan i got my CPU-NB to 2800Mhz cant go over it n ya wat i wat trying to say was close to wat you said i m not good at expressing myself but i wanted to get my RAM to 1866Mhz n the CPU-NB to 2800Mhz n lastly the CPU to 4.3Ghz i m giving 1.53v to it for 4.2Ghz n the temps are close to 60C that wat i hate the Heat wall mad.gif anyways thanx +rep to you buddy n ya i like you guide tooo wink.gif
n ya forgot to ask you when should i add CPU-NB voltages to my CPU ???

any other inputs pls it would be really helpful guys

m currently at 270 Base clock from last like 20mins n i have dropped the multiplier to 6x m doing this to just know my max base clock i could not boot up at 300 Mhz bclk m i no the right track to find out max bclk ?? i have not increased my vcore its a 1.4v
Edited by Tarun - 8/13/13 at 9:38am
post #5 of 7
Yep, you're on the right track. Lowering the multi to the lowest it can go, and then maxxing out the ref clock is the best way out there I know of to check your boards max ref clock (since that is board dependent). Just remember you need to lower ALL your multipliers (ram, HT, etc), otherwise one of those could be what is causing you to hit your max.

I add CPU-NB voltage when my OC is already close to its max, and/or I'm already trying to OC my NB. I can't quite recall my settings for CPU-NB though. You'll likely have to look up the values on that one.

And you said you're at the heat wall? Is it possible for you to strap another fan on your 212 and do a push pull? Those usually help temps by about 2-3c. Also, decreasing ambient, and increasing airflow over the board in general (front and back actually) can help with temps. That might help you get that magic 4.3Ghz thumb.gif.

Good luck with the OC.
post #6 of 7
Thread Starter 
i tried everything to reach 4.3Ghz but with 5mins i get a BSOD with the fooling codes
  1. 50
  2. 7f
  3. 19
  4. D1
  5. 3B
  6. 3D

n ya i have my HSF in a p/P config already redface.gif n i cant reduce my ambient no Air conditioner at home frown.gif n bro its India rolleyes.gif
post #7 of 7
Sorry, I'm no good with figuring out BSOD codes in how they interact with an OC, so you'll have to wait for someone else who knows that stuff better for help on that.

I feel you with the no AC, as I don't have any either. What I do is wait until the evening when it cools down, and cool down the apt as much as I can, and then run benches/stability tests. Its better than nothing, but thats assuming that it cools down at night, which it probably doesn't for you frown.gif.

And also, your OC is already quite good. 4.2GHz is a great OC on a PhII, so you might just be at the max you can go with your current cooling.

You've tried slowly inching up your ref clock with your 4.2GHz Multi-based OC yet? So you should be stable at 200x21 right? Have you tried going to 201x21 or 202x21?
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