Problem Upping The Voltage To 1.65 On Celeron 566@850

[Yodums]

Hey,

I've overclcoked this chip to 566 @ 850. The voltage is currently is 1.6v.

Yesterday I ran Seti then after awhile it either rebooted itself.

Then I tried upping the voltage to 1.65v.

Sometimes the system will not boot at all, or at the loading screen of Win2K it locks.

Current settings are

100fsb
8.5 multiplier
10 l2 lat
turbo frequency low
66/100 signal low
2/3 AGP bus

Tried CAS3 ram...

Heat is not a problem since its only 35-40 full load.

[batboy]

Make sure the speed error check is disabled in the BIOS (you probably already did that). Since your temps are good, try 1.7v and see if that gets it over the hump.

[Yodums]

Originally posted by batboy
Make sure the speed error check is disabled in the BIOS (you probably already did that). Since your temps are good, try 1.7v and see if that gets it over the hump.

Oh yea yup the speed error check is defintely disabled or I wouldn't be able to overclock.

I've tried 1.7 and its sort of worst it will lock where my video card brings out its specs when the start of the boot.

[Max the Axe]

I run a Cel 566 cB0 (1,5V default) @892 easily raising the voltage up to 1,9-1,95 using the famous voltage trick wrapping the right pins. I cant believe your cC0 locks at 1,7V, surely the problem is not that, recheck your cooling system and keep monitoring the cpu temps.

[Yodums]

Originally posted by Max the Axe
I run a Cel 566 cB0 (1,5V default) @892 easily raising the voltage up to 1,9-1,95 using the famous voltage trick wrapping the right pins. I cant believe your cC0 locks at 1,7V, surely the problem is not that, recheck your cooling system and keep monitoring the cpu temps.

Its cool man although I don't know what else to do.

[deez]

Max...he has a cBO...I know this for a fact

tsunami...what kind of PSU do you have and how many case fans. I could not get that CPU to run stable below 1.7v and I ran it for many months at 1.85v wrapped to be able to run@1.7v

Also when I used the coolermaster I had a blowhole cut in the top of my case with 2 80mm fans blowing across the HS and mobo, 2 more 80mm exit fans in the front and a fan on the vid card

[Yodums]

I have some big square fan on the side blowing in about 100+ cfm.

I have sort of a blow hole on top blowing in about 50cfm and I replaced your CoolerMaster original fan with a Everflow 38cfm

[Yodums]

Originally posted by deez
Max...he has a cBO...I know this for a fact

tsunami...what kind of PSU do you have and how many case fans. I could not get that CPU to run stable below 1.7v and I ran it for many months at 1.85v wrapped to be able to run@1.7v

Also when I used the coolermaster I had a blowhole cut in the top of my case with 2 80mm fans blowing across the HS and mobo, 2 more 80mm exit fans in the front and a fan on the vid card

By the way I have a 230 or 250 watt PSU I think that might be the bottle neck...

Although check this:


3v rail is 3.33
5v rail is 5.05
+12v rail is 12.28
-12v is 12.77

[Yodums]

OK So far so good at least until maybe next boot. I've raised the voltage to 1.65 and right now I'm crunching seti and running CPUBurn and hell I'm not rebooting for another 2 weeks.

[deez]

Originally posted by tsunami
I have some big square fan on the side blowing in about 100+ cfm.

I have sort of a blow hole on top blowing in about 50cfm and I replaced your CoolerMaster original fan with a Everflow 38cfm

do you have any exit fans...you may have air turbulence in your case

If your not getting enough juice to the AGP card at 1.7v then its probably the PSU...it should say on the side how many watts it is.

250 is the minimum for coppermine CPU's

[Yodums]

I think its the PSU.. On the cover it says 115/230v

[deez]

the 115/230v is usually a little red switch on the back to switch between Notrh American and European power systems

there should be a tag somewhere on the PSu with brand name and specs

[Yodums]

Oh wait...

"Model: SPX - 250C/2.01"
And at the top it says "SPE"


Most likely to be a generic PSU. Although the rails are good :)

[LutaWicasa]

Have ya tried using a single stick of ram? Depending on what else ya got in yer system, the 250 psu might not be the prob.
You've listed some readings off yer rails but have checked'em out at different times? Do they tend to fluctuate much?
Also in bios the 66/100 sel. should be set to high.

[Snarkey]

I hung up at 1.7 with my p2b-f. Cel566@952. Kept witching the temps and she settled out at 1.80. Set it from the 370-dl slocket. There's a lot of things that could be hanging you. Ram, pci card position ( I got caught for awhile till moved my NIC to a diff slot.)
There are so many variables that I just kept picking away and got lucky (with help from the forum).I cut a blowhole in my case too. Tried diff positions with another cover (it looks like swiss cheese now) till I found the best position for me (down and to the front of the cpu) Dropped about 3 degrees which....I don't know. I think it all added up to stable. Good luck.

[mockingbird]

If I recall directly from when the BE6 came out, it had a problem remembering voltage changes. It would be beneficial if you looked into that.

[hallen]

Maybe your Slot 1/FC-PGA adapter is starting to give you trouble. I had some of the old PC-Chips with tin contacts and they killed my 440LX board.