Overclocking a Katmai 550 mhz

[Michal]

Hi all! ;)
Are some days that am trying to overclock this damn piece of hardware and the frequency that I have riched is 634 mhz(115x5.5).
What I am trying is to increase the vcore voltage from 2.00 to 2.2/2.3 but i don't know how to do it.
I will very appreciate any suggestion on how to rich ~682 mhz(124x5.5).
Thanks in advance.

Bye

[batboy]

With that chip, you will probably NOT go much higher. I'm assuming when you say "rich" you mean "increase". 634 MHz is a good overclock for that chip and is about maximum. Besides, the higher you go, the more the PCI bus is out of spec and the more your cards will be causing you problems. If you're determined to increase the voltage, then make sure you have excellent cooling first. Then check your motherboard manual on how to do this. Many motherboards, especially older ones or ones used in OEM computers have automatic voltage selection that cannot be changed.

[Michal]

Very thanks fatboy!
You are right...in my bios configuration there isn't any manual setting for the vcore. So is it impossible to change the vcore voltage?
My mobo is a P3V4X from asus with the latest bios software.
But the strange thing is that in the mobo manual it is clear to see the advanced bios sub-menu where the manual setting for the vcore is present.

[Michal]

Hmm...sorry...I wanted to say batboy :)

Bye.

[batboy]

Maybe there is still hope of increasing the voltage then. Go into your BIOS and find that advance menu as shown in your manual. Look for the CPU core voltage area. There is probably a setting that says "default". Change that to "user define". If this works, then you should be able to change the voltage. I will caution you that this increases heat, so you should have good cooling before you try this. Besides, that CPU is really almost to it's limit anyway.

[Michal]

Have made a lot attention and didn' t found anything....bah! :)
So...many thanks ;)

Bye

[Endeavor]

i got my PIII Katmai 550 upto 612 and it is at its max, so you got a nice overclock

[Michal]

Very thanks!
I have two small heatsinks on the cpu cache with a top motor fan.
My system seems to be very stable but am trying to made it stable at 660 mhz too :)
I think it will be impossible....muahahahahahaha :)

Bye

[Nathan Detroit]

Go to page 19 of this (http://developer.intel.com/design/PentiumIII/datashts/24445208.pdf), and then go here (http://www.tomshardware.com/cpu/98q4/981215/sl2w8-06.html). According to table 6 in that PIII datasheet, the VccCore absolute maximum is 3.0v giving you an additional .6 - .8v to play with comfortably. Remember that every core is different, I've had my VccCore at 2.8 and have had no problems, but yours might burn out at 2.2. who knows... so play at your own risk...

[Michal]

Very thanks Nathan...i have only a question for you:
so pins are:
vid2=a119
vid3=b119
vid4=a121

which pin is the vid1 ?
I want to set the vcore to 2.4 volts but i need to know which pin is that.
You have been very usefull.....many thanks :)

[Shadow ÒÓ]

hehe I dunno.......I kinda like fatboy! =)

[Michal]

Ok ok...sorry Nathan....I was very tired....now i know which are all the pins :)
Guys...gonna to burn my cpu....MUAHAHAHAHAHAHAHAHAHAAHA

[batboy]

Please do not listen to people telling you that 2.8v will be ok. Personally, I would not go over 2.2v or 2.3v at the very most for that chip unless you truly want to fry it. you don't seem to understand that 600-650 MHz is really the typical max for that chip. To go higher, Intel had to completely redesign the processor, hence the coppermine cores were born.

[Michal]

Batboy you are right!
Have tried, tried and tried....nothing! Damn piece of hardware...maybe the core voltage was too high...I set it at 2.4 volts and it was impossible to run windows correctly. Maybe with a 2.2 voltage core it would be better...but I am very tired to try it one more time. Now at a frequency of 634 mhz my cpu seems to be very stable so I think I won t gonna increase the vcore.
Very thanks Batboy!
Bye

#Michal

[Nathan Detroit]

removed due to advice from senior member.

My apologies.

[Nathan Detroit]

Katmai's get hot, so if you're gonna play with it, please keep it cool.

[Stealth]

My brother HAD this same chip, Keyword is HAD, he let the magic smoke out of it trying to do what you are doing right now, upping the Vcc to high. If I were you I would settle for what you did get out of it, or take a real chance at haveing nothing at all.

[batboy]

Nathan, maybe you should read your own post again. The MAX voltage is 3.0 which means maximum. Take a look at any voltage monitoring program and you will see that there is always a constant up and down variation in voltage. There is always little surges of AC power coming down the lines from the power company. You need a bigger safety cushion than you think. Not to mention that excessive voltage is not good for all the micro switches and gates inside your CPU. Excessive voltage will significantly decrease the life expectancy of the CPU. We don't care if you fry your own CPU, but please don't tell other people it's ok to do unless you happen to be a CPU design engineer or have the experience of doing this with dozens if not hundreds of CPUs over a long period of time. Just because you haven't fried your chip yet at those high voltages, don't mean it won't fry next week. Besides, high voltage creates extremely high heat. Maybe you have your cooling firmly under control, but what if the person you're recommending high voltage doesn't? Please use caution when giving advice to others. Also, dozens of other people read these posts that never respond and might not even be members. Here at overclockers.com we strive to give the best and most accurate advice possible. I would like to think I earned my senior member status because I am sort of knowledgeable in overclocking and don't give foolhardy advice. My friend, without people like you pushing the envelope, we would never find out what the limits truly are. But, you just might have a tougher CPU than most or might just plain be the luckiest guy alive. I think most of us will agree that more than a 15% increase in voltage is not really recommended in most situations.

[Michal]

Hi all Guys :)
Have very appreciated all your presences....It was very happy to read your attend Stealth :) ...sure...about the magic smoke :) :) :)
Mhhh...don t worry I know all these things...that a higher voltage may burn the cpu core, that it is important having a good cooling system........am not a newbie as it can seem.
The only thing I can say is: Thanks!
True things are that I am new to this forum and foreign...The impression that this forums gave me was very nice :)

Bye all :)

// Michal

[batboy]

You're ok Michal, I like you and your happy faces. :)
Good luck on your overclocking adventures. :)

[Michal]

Very Thanks Batboy :)
I'll become red if you insist :)

Bye.

# Michal