What to shoot far when OC'n

[CR]

Hello,

I just wanted to share some info on Overclockin Intel CPU's.


I belive that
66 to100
100 to133
are good targets to aim for.
If you get a Celeron, to hit 100mhz, you'll get some good stability
If your P-3 100fsb, hits 132-133, or higher, you'll be stable in the 130fsb range, as well.

1gig at 133fsb will smoke a system of 1gig at 100fsb, again these test results are with larger HS&Fans..

Other cooling methods can take your fsb's higher

I have seen that high Mhz look impressive, but I have found that higher bus speed, ex: 130fsb and above will Rock your "entire systems speed."
shoot 4- 66fsb to hit 100fsb
shoot 4 -100fsb to hit 133fsb

At these speeds your, AGP and ,PCI and IDE, are the least problem areas..

From these points you can adjust a "little over or under" at these target FSB speeds.

My P-3 650 at 878mhz at 134fsb, will hit 132 and 134fsb, but is unstable at 133fsb.

Voltage as you know plays a important part ,also.

These studies are from my personal trials with the C-II and P-3's & A-Bit MB's..

Not many Cel-II see higher than 100fsb
Most P-3 won't hit over 133, If so, not by much, "Under normal cooling.

Just some Info..

Does anyone know if I/O voltages effect a systems ability to OC???

God Bless & Enjoy

RF





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[Slake]

Hello CR. Welcome to the forum. I'll go out on a limb and venture a guess that I/O voltage may need to be increased on a heavily loaded system (lotta fans,pumps and peripherals) I flunked out of electronics though. I wouldn't think you'd want to increase I/O voltage unless it appears something isn't getting enough juice. Even then, wouldn't current be the issue? I have seen reference to it in other threads but don't remember any specifics. I bet Tim would be able to give a definitive answer to that question.

[[OC]_SR20DE]

CR,
Very good statements. The facts about you said do apply in many cases. I kinda enjoyed reading.. :)

As far as I/O Volatages go, yes it is sometimes needed when you overclock your system. Like what Slake said about extra I/O voltage will feed the rest of all of PCI/AGP devices in the system to insure stability. Im sure Tim has good answer to this and also the Senior member "Dimmreaper" knows very well about these things. Increasing the VIO excessively can harm your AGP/PCI components though, so use it with care. Bottom line is that you can increase the VIO by a notch or two as your system needs it.

[Shadow ÒÓ]

heya! welcome to the forum.

Can't say that PIII's won't hit 133 unless you mean the 100 mhz fsb's as most any PIII 133 I've OC'd will easily do 146 or 148 with just air cooling.

assuming you are talking about the E chips.......yea 133 is probably a top end w/o extreme cooling.

PCI/AGP usually aren't the cap with good boards because of dividers tho.

[CR]

Hello,

Thanks for the good respond to this posting.

I just bought a P-3 850-100fsb, and I'm having a time trying to get it at a "every bus is happy" fsb..look as if 133 is not going to happen,If I remember,124fsb is a semi-norm fsb for the other buses.

I'm at 118fsb with my P-3 850-1003mhz, which isn't too bad..
In your option which would you prefer for a server: P-3 650@872-134fsb.
Or a P-3 850@1003-118fsb?

Can anyone tell me how to read the stepping and which one clocks better??

Thanks
CR

[Shadow ÒÓ]

depending on the CAS I'd take the 850.


This may help on the stepping.........

http://support.intel.com/support/processors/sspec/p3p.htm

[[OC]_SR20DE]

yeah.. I agree with Mr. Shadow. He's right.

From those two comparison, and with only 16mhz FSB difference, .. yes the 850oc'ed at 1003 is better.. it'd be even better if can set the RAM timing to CAS222 if stable..

[CR]

Hello,

I found out my P-3 850, is a cC0 stepping.

Is cB0 better for hitting higher fsb speeds??

Also at 118fsb on my cpu bus ,what is a safe divider on the pci setting ,1/2, 1/3, 1/4...

1/3 puts me at a 39 pci speed.
1/4 puts me at a 29 pci speed
1/2 puts me at a 59 pci speed..

Should I try to get the closest to 33 PCI bus speed??

I really don't want to fry anything on this MB...

Thanks
CR

[[OC]_SR20DE]

no.. cC0 stepping is a better one. They'll overclock better than the cB0. Glad you have you a cC0.

at 118fsb.. it's little questionable as to what would be the best setting on the PCI divider. You can start with setting the PCI at 1/3. If not stable, then try underclocking the PCI by setting it at 1/4. You'll just have to experiment with it until your system gets stable.
And no worries.. it's actually difficult to fry your mobo so give tweak it hard! :)