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Help Getting P4 650 Stable

post #1 of 48
Thread Starter 
New to the forum, have read and learned much. Do have a couple questions dealing with stability though. Right now I'm sitting at 4.17GHz 245*17, 3:5 FSBRAM 5-4-4-12. My machine is randomly freezing and/or restarting automatiucally after 100% HT load for various amounts of tim. I've bumped my vcore up 1 spot from the default to 1.3625, does it need to be higher to keep me stable? Ther RAM is also at the default of 1.80v. I've locked the PCIx to 100. Temps are good, 42/55 right now. Please tell me what I can do to get my OC stable. Or should I just lower it? 1 120mm exhaust, 1 92mm intake, Zalman 9500 w/ AS5. Still kind of a newb at OC'ing, only been doing it for around 3 months, still haven't perfected everything yet. Any help would be greatly appriciated.
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post #2 of 48
Quote:
Originally Posted by Ringfinger
New to the forum, have read and learned much. Do have a couple questions dealing with stability though. Right now I'm sitting at 4.17GHz 245*17, 3:5 FSBRAM 5-4-4-12. My machine is randomly freezing and/or restarting automatiucally after 100% HT load for various amounts of tim. I've bumped my vcore up 1 spot from the default to 1.3625, does it need to be higher to keep me stable? Ther RAM is also at the default of 1.80v. I've locked the PCIx to 100. Temps are good, 42/55 right now. Please tell me what I can do to get my OC stable. Or should I just lower it? 1 120mm exhaust, 1 92mm intake, Zalman 9500 w/ AS5. Still kind of a newb at OC'ing, only been doing it for around 3 months, still haven't perfected everything yet. Any help would be greatly appriciated.
You are safe while your vcore is under 1,525V but don't just bump it unless you feel your overclock is unstable. Bumping your vcore will drastically increase CPU heat output (a lot more than when you increase your FSB).

Your overclock might be unstable because your FSB:RAM is running at 3:5.
This means that your memory is running at 408 MHz !
There's little to no performance to be gained when running at more than FSB:RAM set to 1:1 as the CPU will be doing all the processing and RAM will just have to wait until the CPU is done to feed it with more data.
Set the FSB:RAM to 1:1 and try again.
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post #3 of 48
Thread Starter 
Thanks for the reply... I had a feeling the RAM was what was causing the freezing. I have however done some Sandra testing with different FSB:RAM ratios and found HUGE increases in bandwidth by having a 3:5 instead of a 1:1. Yet, you're saying there is little to no gain? I have PC6400 at stock, which means I should be able to run 400MHz no prob right? So why is 408MHz so bad? Can I not just up the voltage on my RAM as well and have it be stable? Let me guess, not that easy huh?
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post #4 of 48
I would increase the core voltage in 0.05V increments and test for stability. Watch your temperatures. I don't think it is a DRAM problem. There is a difference in ECC translation with a higher dram --> cpu ratio but it is indeed fairly minimal in a system that is not producing many errors.

My advice? Set your fsb --> ram ratio at 1:1 is also my advice as it matters so little after a 1:1 ratio. I believe your problem is vcore limited.

R
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post #5 of 48
Thread Starter 
Alright thanks Ropey... so you're saying I should bump the vcore of the CPU higher then 1.3625?

I just went down to a 1:1 ratio with the same OC of 245*17, and am getting RAM errors after about 20mins @ load. When booting the RAM now says that I have PC2-3200. See, thats where I'm getting lost. I bought 800MHz PC2-6400 RAM, and don't understand why I can't have the FSB:RAM ratio to whatever it needs to be as long as I stay ~400MHz on the RAM? PC2-6400 is indeed "dual-pumped" 2*400MHz correct?
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My System
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post #6 of 48
3:5 is pefectly fine and I woulnd't recommend a 1:1 ratio.

That's why Intel went for the DDR2 route, DDR is not good for a chip that needs to stretch those long 31 stage-pipelines.

Ever since I switch to DDR2 I've run my system with a 3:5 and 1:2 ratio, preferably 1:2;



My suggestion is to run them at 3:5 with 4-4-4-10 timings @ 2.1v or 2.2v. Wiht a 4.17ghz OC, it should be somewhere in the 1.43v.

Can't go wrong..........BTW, I did OC my 650 to 4.42ghz on a 1:2 ratio: LINK.
post #7 of 48
Thread Starter 
Wow, thanks for your help and pics... To me, running in 3:5 was great... didn't personally like 1:! as it was slower and got errors. So you think I should lower the timings a lil, up the voltage on the RAM as well as the CPU?

Heres a couple pics and validations..


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P4 650 ASUS P5WD2-P XP Pro Sp2 Samsung 19" LCD 
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400W Antec Antec Performance TX640B 
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My System
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P4 650 ASUS P5WD2-P XP Pro Sp2 Samsung 19" LCD 
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400W Antec Antec Performance TX640B 
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post #8 of 48
Quote:
So you think I should lower the timings a lil, up the voltage on the RAM as well as the CPU?
Of course!
post #9 of 48
Thread Starter 
Did what you sugested Nasgul. Temps are now up to 56-58C @ load after 1hr. Changed the mem voltage to 1.95 and the CPU voltage to 1.400. not quite as high as you suggested. Think I'm good to go? Although I thought I was with previous OC's and 9hrs later I'd crash

Here's a pic of benchies after the change... what do you think?
My System
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CPUMotherboardOSMonitor
P4 650 ASUS P5WD2-P XP Pro Sp2 Samsung 19" LCD 
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400W Antec Antec Performance TX640B 
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My System
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CPUMotherboardOSMonitor
P4 650 ASUS P5WD2-P XP Pro Sp2 Samsung 19" LCD 
PowerCase
400W Antec Antec Performance TX640B 
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post #10 of 48
your settings look good. The vcore might be a little low still, but only testing will tell. Don't let the temps get over 60c...as the chip will start to overheat at about 66-67c and start to throttle itself. Your ram is rated for 800mhz...so it is running just barely faster than that so it is good where it's it. A 1:1 ratio is better for ddr ram, not ddr2. Zalman coolers(IMO) are not the greatest for overclocking...good for being quiet but not the best for cooling. Look into a Thermaltake "big typhoon" for some better temps and you can probably get it a bit farther. You should be able to get 4.2-4.3 with no trouble and possibly farther.
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