c1 p42ghz@3ghz, 1.625v

[FC]

i've just installed my new c1 2ghz northwood and in runs now smoothly 3ghz, with a real vcore of 1.65v. isn't it to much? i realy don't want to make another post in the The Official Sudden Northwood Death Syndrome (S.N.D.S.) Thread..:)
the idle temperature is 38c, at full load 48c.

edit: it was not stable with 1.625v, so i changed it to 1.65v

[TC]

Nice OC. According to Intel specs max voltage is 1.75, so stay under that and you have a good chance of being okay. I'd say 1.7 or less personally.

[FC]

i've lowered the fsb to 140mhz, so it runs now 2.8ghz with a real voltage of 1,475v, 0.05v under the default. maybe i'll stay there, 200mhz+ is not worth if i have to increase the voltage with 0,175v for it.

[Enigma422]

Hey FC, where did you happen to get this C1 stepping 2GHz CPU?

[FC]

hungary, europe

it runs 2.9ghz with the default 1.525v vcore, above that speed i have to increase the voltage in big steps. 3.1ghz is the max with 1.725v. i'm using a stock hsf.

http://web.axelero.hu/imikri/kepek/wcpu.jpg

[jmsandrsn]

I'm getting similar results with the C1 stepping P4 2.0 GHz that I just picked up. Was able to boot into Win98SE without a problem at 150 FSB with 1.525v (according to BIOS) but it immediately failed Prime95. Tried 1.575v and the same thing. Tried 1.6v and it ran about 8 iteration of Prime before getting an error. Trying it right now at 1.625 and hoping that I don't have to go up much further.

It's done about 15 iterations so far. Temp is coming in at about 46C/114F using Alpha 8942 and P4B533.

[Stockli]

Nice OC, man. Go grab SP3... :D

[jmsandrsn]

Originally posted by jmsandrsn
I'm getting similar results with the C1 stepping P4 2.0 GHz that I just picked up. Was able to boot into Win98SE without a problem at 150 FSB with 1.525v (according to BIOS) but it immediately failed Prime95. Tried 1.575v and the same thing. Tried 1.6v and it ran about 8 iteration of Prime before getting an error. Trying it right now at 1.625 and hoping that I don't have to go up much further.

It's done about 15 iterations so far. Temp is coming in at about 46C/114F using Alpha 8942 and P4B533.

Got an f***** error after about 10-15 minutes. Guess I'll give 1.65v a shot.

[laja]

My 2 Ghz C1 (OEM processor) is not Prime 95 stable at anything above 2870 Mhz. Boots at 3 Ghz but immediately fails Prime 95. My actual voltage is 1.7 V.

To the thread starter with the voltage fears: up to 1.7 V with decent cooling is said to be safe (Intel said so).

[jmsandrsn]

Originally posted by jmsandrsn


Got an f***** error after about 10-15 minutes. Guess I'll give 1.65v a shot.

got an error at 1.65v as well after 10-15 minutes.
I'm praying that 1.675v will do the trick. Even at 1.675v it periodically will dip down to 1.616v according to PCProbe.

I may end up just putting this thing in the Dell machine and run it at 2.66 GHz.

[Stockli]

Good luck.

[jmsandrsn]

I let Prime95 and 3DMark2001 run simultaneously and it locked up after 94 screens of 3DMark2001. I'm trying 1.7v (in the BIOS) as a last ditch effort. I never realized how bad this board undervolts. It is currently set at 1.7v int he BIOS but most of the readings from PcProbe seem to range from 1.64 - 1.66v.

I may have to send this one out to pasture to live a rather dull life at 2.66 GHz in one of my Dell systems.

[FIZZ3]

Originally posted by jmsandrsn
I let Prime95 and 3DMark2001 run simultaneously and it locked up after 94 screens of 3DMark2001. I'm trying 1.7v (in the BIOS) as a last ditch effort. I never realized how bad this board undervolts. It is currently set at 1.7v int he BIOS but most of the readings from PcProbe seem to range from 1.64 - 1.66v.

I may have to send this one out to pasture to live a rather dull life at 2.66 GHz in one of my Dell systems.

Your chances of getting that CPU stable with increased voltage are slim IMHO. I have had very similar experiences with 2.0A chips (beit B0) that would not budge no matter how high I set the voltage. That was in the then-normal range of 2340Mhz stable at stock voltage and 2360 unstable even at 1.75v.

I think this is a pattern with these NW chips... either they clock up very high on stock voltage or little more or they don't at all.

[Overclocker550]

who cares if it locks up on prime95 if its stable on all games then ur good to go. I had a 366 celeron at 550 that was stable on everything except 3dmark2000

[laja]

Well if your CPU was not stable in 3dmark 2000 then it must have been quite unstable in other CPU-intensive applications as well. Prime95 gives me a peace of mind. If it runs for just 30 minutes, I'm quite sure that any error I get is not caused by the CPU or the memory but by my video card or software.

As to the voltage increase, I partly agree with Fizz3. It seems that raising the voltage to a reasonable level (say up to 1.7V) may help. Anything above that doesn't result in a higher clock speed.

[Overclocker550]

I never tried prime95, just quake3 and it runs fine. needless to say im using the 300a at 504 now cause that will do 3dmark 2000 without crashing. also I benefit from 112fsb

[jmsandrsn]

AT 1.7v (set in the BIOS) it ran Prime95 all night while looping 3DMark2001.

[FC]

a realised that i don't like like living on the edge..:) i'm running my cpu now at 2.8ghz with a vcore of 1.475. the idle temp is now 36c, at full load after 10 hours running seti 48c.

[laja]

I will never understand why you would want to UNDERvolt a Northwood...

[FC]

just because i can..:)

[Overclocker550]

does undervolting do any good? I can undervolt my celeron to 1.9 but any lower and it gets unstable. I never bothered other than for laughts for 10 minutes

[FC]

lower voltage, lower temperature...

[siDDis]

my b0 2.0 is prime95 stable at 2666mhz and 1.65v @45 degrees full load
and I cant go any further cause my mobo refuse it
(sometimes I have to boot at 132mhz fsb and run it for one minute and then switch over to 133mhz fsb)