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Should I got past 3.8GHz on 955 BE revision C3? - Page 2

post #11 of 79
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Quote:
Originally Posted by httuner View Post
NB Frequency has a huge influence on Ram performance & I believe a few other things I dont know of lol_ but download MaxxMem and do a benchmark you'll see the difference between regular 2000mhz NB to 2600+mhz NB

You might be able to do 2800mhz NB Frequency with 1.25volts + on the CPU/NB Voltage_ (or VDDNB Voltage)
Thanks for the info, I just bumped the mulit up to 21.0 and as soon as I started prime a worker Failed and got instant BSOD with 1.500v

Should I set it at 1.550v and see if it hold at 4.2, then back down the V step by step? Never had this computer BSOD...not going to lie, freaked me out a little lol
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post #12 of 79
Quote:
Originally Posted by KhaoticKomputing View Post
Thanks for the info, I just bumped the mulit up to 21.0 and as soon as I started prime a worker Failed and got instant BSOD with 1.500v

Should I set it at 1.550v and see if it hold at 4.2, then back down the V step by step? Never had this computer BSOD...not going to lie, freaked me out a little lol

Impressive. I have had more bluescreens than any other kind of screens while I was seriously into overclocking.

1.55 should be safe, but you can never predict how long the chip will handle the CPU frequency at that operating voltage. I would go for it, run a couple of benchmarks at 4.2, then drop it back down to 4.0GHZ for 24/7 use.
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post #13 of 79
There are more voltages to adjust than just the CPU core voltage.

Upping your NB frequency can help stability on core overclock, upping your CPU-NB volts definitely will.

Also your NB volts (not to be confused with CPU-NB) can be raised .1v, this frequently stabilizes overclocks.

You definitely want to aim to get your NB as high as possible along with your RAM timings as tight as possible. The performance difference is phenomenal, seriously.

As far as core voltage, I would keep it at or below 1.5v (max) for 24/7 use. 1.55v is safe for suicide runs, but at this voltage you will start hitting your CPU's frequency limitation anyways, and it's rarely worth the exponentially increasing heat/volts for such minimal frequency increases. I switch between 3596mhz @ 1.488 volts (1.5v bios) and 3480mhz @ 1.44v (1.5v bios), mostly choosing the latter. Performance is cool, a long lasting chip is cooler, pun intended.
Edited by willibj - 4/24/11 at 10:32am
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post #14 of 79
Thread Starter 
With the voltage at 1.550 it still crashed(BSOD) the second I started Prime95@ 4.2Ghz.
I have noticed that the computer has a hic-up on start up. Befor the OC when window's was loadinh, I could move my mouse around the exact second it started, now it will have a pause only for like a second, the little loading circle stop's turning, it will stall like that about 2-3 times the first 10-15 seond's. Other than that is seems speedy, and has ran Prime95 on blend for the last 2 hours(as of 3:46pm US Central) with out a hitch.

On stock clock it didnt stall out, just curious if it's a negitive reaction to the OC or if its normal. Thanks in advance
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post #15 of 79
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No go on long term stability at 4Ghz, I think I'm going to need to play with more than just the multi to get 4 stable I'll be working on my google foo and report back. Any other assistance is welcome
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post #16 of 79
Quote:
Originally Posted by KhaoticKomputing View Post
No go on long term stability at 4Ghz, I think I'm going to need to play with more than just the multi to get 4 stable I'll be working on my google foo and report back. Any other assistance is welcome
Seriously?

Quote:
Originally Posted by willibj View Post
There are more voltages to adjust than just the CPU core voltage.

Upping your NB frequency can help stability on core overclock, upping your CPU-NB volts definitely will.

Also your NB volts (not to be confused with CPU-NB) can be raised .1v, this frequently stabilizes overclocks.

You definitely want to aim to get your NB as high as possible along with your RAM timings as tight as possible. The performance difference is phenomenal, seriously.

As far as core voltage, I would keep it at or below 1.5v (max) for 24/7 use. 1.55v is safe for suicide runs, but at this voltage you will start hitting your CPU's frequency limitation anyways, and it's rarely worth the exponentially increasing heat/volts for such minimal frequency increases. I switch between 3596mhz @ 1.488 volts (1.5v bios) and 3480mhz @ 1.44v (1.5v bios), mostly choosing the latter. Performance is cool, a long lasting chip is cooler, pun intended.
Basically this:

CPU-NB. change the multiplier to x13 and the volts to 1.3v (might be able to go lower, might need a little more though doubt it)

NB volts (not to be confused with CPU-NB) raise by 0.1v

CPU-core voltage back down to 1.5 (probably less). If you're still unstable then slowly bring this back up.

Other tips - loosen timings on RAM to shoot for the OC or lower your HT frequency one multiplier step. Eventually you want to get your NB up to 2800mhz or higher (if possible). You can safely use up to 1.35-1.4 volts to reach this, depending on temps.

Your NB is what is stopping your OC. You need to raise the frequency and voltage on it (read above)
Edited by willibj - 4/24/11 at 5:05pm
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post #17 of 79
Feel free to overclock as much as you want, but I wouldn't keep it there 24/7. I have (selling right now) an X4 955 C3 and i didn't really overclock it. I did try and see, with the motherboard overclocking utilities, to see how high i could get it. It ran, for me, at 3.8 stable under 60 degrees Celsius, so i beleive that you could get it to run 4.0 max 24/7 with an h70 or something extreme for cooling. I don't think you have to worry about the chip dieing on you. Good luck with the overclock!
post #18 of 79
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Thank you guys so much! I'll play with it today some. I left it at 3.6Ghz overnight, no chrashes, held prime and ran games just fine. i'll see about raising the NB freq, would be nice if I could do 4ghz 24/7

As far as cooling, I dont think ill be downgrading to an HXX cooler my temps are perfect, at 1.550v when I left it on prime temps NEVER got past 43c, So what ever is causing this "wall" is probly NBfreq or somthing like that ill play with it today Thank agin!

Is there any major long term prolbme's with the NB at 2800mhz?
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post #19 of 79
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also,I noticed that above 3.6Ghz my CPU dosnt downclock on idle, is this normal?
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post #20 of 79
Quote:
Originally Posted by KhaoticKomputing View Post
also,I noticed that above 3.6Ghz my CPU dosnt downclock on idle, is this normal?
Cool'n'quiet downlocks your system when it's idle, but if I remember correctly, C'n'C stops working above 16-17 multipler '?' meaning 3.6ghz or something like taht, so yeh it's normal, IF you ahve C'n'C enable ^_^, Of course, if it's diabled, it wont downclock even if not overclocked ^_^ *that is if I remember correctly ^_^
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