P3 cpu speed?

Cpl Rampage · Post by **Cpl Rampage** » Tue Apr 26, 2005 5:49 pm

well i am new to these fourms, i got a bp6 from my neighbor about a week and a half ago, it had dual 366. i oced them to around 500, and it was great, but it was no enough, so i read about the PIII mod here, and decided to do it.

so i update the bois with this http://www.bp6.com/board/dload.php?acti ... file_id=52
i ordered the adapters from the powerleap website, modified them, by cutting the trace.

i won the 866mhz pIII s off of ebay, put them into the neo with it set for fsb 100

modded the mobo, with the wire on the back.

so i boot up and WOOOT it works!!!

i got it running fine, reconised the cpus, and posted.

but there is only one problem, the cpus will only go 650mhz.

i set the folowing settings in the cpu soft menu:

cpu name: intel pentium III MMX
cpu operating speed: user define
turbo frequency:disabled
external clock: 100mhz (1/3)
multiplier factor: x8
agpclk/cpuclk:2/3
speed error hold: disabled
cpu power supply: cpu default
1.70 volts

and ill save the info to bios, but it still posts at 650mhz, and when i go back in to bios, it still says it is set to run at 800mhz

Can some one help me?

all help is greatly apreciated

davd_bob · Post by **davd_bob** » Tue Apr 26, 2005 10:29 pm

Welcome aboard.

If memory serves, those CPUs are designed for 866@133FSB with a locked multiplier of 6.5. If so then they will be 650@100FSB.

By what you said you have quite a bit of experience and already can figure what is limiting your system...
or you are extreamly talented to handle those mods so easily.
In either case you will find your answers somewhere on BP6.com

Tell us, are your P-IIIs rated for 100 or 133FSB?

Cpl Rampage · Post by **Cpl Rampage** » Wed Apr 27, 2005 4:44 am

yah my 866 are made to run at 133, but i am not sure my board is stable at that speed. if there is nothing i can do about the multiplier, then ill just have to increase the fsb to as fast as i can get it.

edit: my worklog of this project is here
[url]here:http://forums.pimprig.com/showthread.php?t=41732[/url]

BCN · Post by **BCN** » Wed Apr 27, 2005 5:18 am

you have to work hard to get it run at 133FSB - I would opt for peltier on the chipset, and maybe caps replaced. just try. They say it was done...

hyperspace · Post by **hyperspace** » Thu Apr 28, 2005 6:52 am

You may be able to run at 110 Mhz FSB. With heavy modificaions, you may be able to reach 124 Mhz FSB. Maybe.

phaedrus · Post by **phaedrus** » Sat Apr 30, 2005 11:27 am

Congrats on the PIII mod! If you want it permanent, I suggest epoxying the wires on the back of the sockets. Solder just isn't a strong mechanical connection.

If the board is used, it might do 110, but will need significant cooling. I tried pretty hard to boost mine past 100, and did not succeed. Boosting the CPU voltages seemed to help the best out of anything I tried. Hit Yoichiro's site and look at his overclocking sections for what he did. It will require better cooling all around (CPUs and Northbridge).

At this point, I'm pretty sure that the BX440's design and fab process gives the chips a gauranteed 100MHz capability, but above that it's the luck of the draw. To get an uncooperative BX to go faster, I think you'd probably have to cool the BX into a whole different temperature regime to significantly alter the properties of the transistors (oops, that spills the beans... Now you guys know what's been going on in my mind...

).

I highly suggest recapping the board. I've come to the conclusion that the VRM mods are not necessarily worth it. Have fun, and good luck.

Jeff

SnackMasterX · Post by **SnackMasterX** » Tue Jul 26, 2005 10:43 pm

I have a pentium II 1 GHZ with 133 FSB, I don't quite understand everything going on here and was wondering if someone could possibly help me a bit with trying to get my processor to work in there.

davd_bob · Post by **davd_bob** » Wed Jul 27, 2005 4:27 am

SnackMasterX wrote:I have a pentium II 1 GHZ with 133 FSB, I don't quite understand everything going on here and was wondering if someone could possibly help me a bit with trying to get my processor to work in there.

SnackMasterX,
Welcome aboard.
I don't believe I ever heard of a P-II that can handle 1Ghz nor 133FSB. Can you tell us where you got that information from?

hyperspace · Post by **hyperspace** » Wed Jul 27, 2005 7:33 am

Welcome to BP6.Com, SnackMasterX !

450 Mhz core with a 100 Mhz FSB is the top end of the Pentium II series.

Click here for more information.

SnackMasterX · Post by **SnackMasterX** » Wed Jul 27, 2005 9:30 am

Sorry my keyboard must have been glitchy, I meant Pentium III (3) not 2.

jaybird · Post by **jaybird** » Wed Jul 27, 2005 9:32 am

Welcome aboard!

The best thing you can do to increase stability and possibly hit 124 is to use active cooling on the BX.

Until a couple of weeks ago I had been running a BP6 with 2, PIII 1100E's (1100/100/256/1.75V) @ 110 FSB for several years. Alas, my BP6 passed away 2 weeks ago

, Long live the BP6!!!!

The only mods to my board were:

A GOOD 450W PS!
EC10 cap replacement
the voltage regulator replacement
NEO 370 mods (cut traces)
rewiring on the back side of the board
and MOST EMPORTANT, adding a mini-peltier to the BX! (do a search on eBay, shouldn't cost more than $4.99 + S&H USD!)

If you would like pics of my mods I will gladly post them here

Regards,

jaybird

SnackMasterX · Post by **SnackMasterX** » Wed Jul 27, 2005 9:40 am

Yes could I please see some pictures of the mods?

jaybird · Post by **jaybird** » Wed Jul 27, 2005 12:09 pm

I'm at work right now (12 noon, CDT, USA), will try to post when I get home today. They are not the most clear but I will try to explain what I did and why.

Regards,

jaybird

SnackMasterX · Post by **SnackMasterX** » Wed Jul 27, 2005 12:25 pm

Alright, I am going to be at work as well until 5 PM (EST, USA) and then I have a places to stop before I return home.

davd_bob · Post by **davd_bob** » Thu Jul 28, 2005 12:11 am

SnackMasterX,
Are you putting a P-III on a BP6? If so are you going to "dual" cpus or just a single. There is much less work in making a "uni" cpu BP6.

SnackMasterX · Post by **SnackMasterX** » Thu Jul 28, 2005 2:09 pm

Well I was going to try with a single first and if it worked out I was going to dual but I decided against it, I just bought a card for my current server but I have a 700 and 600 MHz Celerons so I may try those in hopes of getting something to mess with, I need to learn linux and this may be the only system I have the option of at the moment but havent had luck with either of those Celerons in the past on that board. Since this is a Pentium III thread I will just find another one for Celeons, but if you can help out please PM me.

davd_bob · Post by **davd_bob** » Fri Jul 29, 2005 12:37 am

SnackMasterX wrote:Well I was going to try with a single first and if it worked out I was going to dual but I decided against it, I just bought a card for my current server but I have a 700 and 600 MHz Celerons so I may try those in hopes of getting something to mess with, I need to learn linux and this may be the only system I have the option of at the moment but havent had luck with either of those Celerons in the past on that board. Since this is a Pentium III thread I will just find another one for Celeons, but if you can help out please PM me.

700 and 600 MHz Celerons...will be FC-PGA chips and absolutly will NOT work in dual. If you are wanting to work in a dual environment, just stick with a couple of the older class celly 366MHz and overclock them to run at 550MHz. It will not require ANY modifications and will crank out great preformance. On the other hand, a 700MHz sitting on a PowerLeap Neo S-370 adaptor will probably overclock to about ONE GHz and other then the NEO adaptor it wont require any modifications. Your choice.

PMed ya too.

jaybird · Post by **jaybird** » Sat Jul 30, 2005 10:19 am

Sorry it took so long but the "honey do" lists came first

It ain't pretty but it worked for 2 1/2 years!

There are a total of 8 pics (I believe you can view them through my personal bio?):

1. basic shot of the board with 1 heatsink, NEO & PIII installed
2. close-up, HS and "U" clip extender(made from a paper clip)to allow
for extra thickness of NEO 370. Here you can also see 386 fan
attached to BX, large blue cap and voltage regulator heatsink.
3. different view of large cap, HS and regulator(note green leads form
cap leading out and through hole in board to backside of BP6.

I think I should expain what I did here. I simply cut the 3 connections to the voltage regulator and left it soldered to the board rather than possibly damaging the board trying to remove it. I then soldered the center post of the new regulator to the exposed ground side of the regulator still on the board, ran the + side of the regulator to the cap and then ran the wire from the cap directly to the 5V pin on the back side of the board at the power supply connector. I did this because when I measured the input voltage at the old regulator it was not even 5V! I then ran the - side of the cap through the board and soldered it at the ground plane connection of the old regulator(you can see all of this except the actual soldering of the regulator in the #3 & 4 pic's). The large heatsink on the regulator is a generic unit I purchased at RadioShack, got the regulator and cap there also, total cost of RadioShack parts, less than $10.00 USD.

Pic 4 also shows the connections made on the back side of the ZIF sockets.

Pic's #5 & 6 show the CompUSA PIII heatsinks(top and bottom).

Pic's #7 & 8 show the top and bottom of the "Mini-Peltier" purchased on eBay(note, it was attached the same as the 386 fan with a wire tie and also note that I had to bend 2 of its' "wings" up to clear items on the MOBO, also, I inverted the fan as to blow down instead of up, this removed the chance of any condensate from forming on the BX chip-set).

Board shots do not show the Peltier installed, these were earlier shots with just the 386 fan installed.

End results:

2, PIII cpu's (1100E/100/256/1.75V) @ 110 FSB(1200mhz), never went above 127 deg F @ full load for 2 1/2 years!

BX never went above 112 deg F @ full load!

Questions anyone?

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