voltage on a bm6 with a ceron 600 help!!!

[aardvark]

Help, i've got a celeron 600 (pretested to 900) but can't get past 750 as the motherboard won't let me go above 1.7volts. Anybody know how to fool the motherboard and get that voltage up??

cheers

 

[kwg]

Me too....I'm in a similar boat.

My 566/850 (w/GORB) locks in UT after a few minutes at 1.7V.

Email to Abit:
] Could you please allow a higher voltage range for the Celeron2?
] e.g. up to 2.0V
] 1.7V max just isn't enough...
] Or a separate utility to "unlock" the voltage range.

Reply:
] We are sorry to say that we can't do so. "Default Vcore + 0.2V"
] is our policy to protect CPU.
] For celeron2 533A, default Vcore 1.5, maximum Vcore 1.7
] For coppermine 733, default Vcore 1.65, maximum Vcore 1.85


BTW, I read that faster Cel2s had a higher def voltage - is this true?

Since other Abit boards just got a new BIOS over the weekend, I
imagine the BM6 is next in line.

I haven't put a lot of time into the voltage trick, so that's my next
step.

 

[aardvark]

i've tried that voltage trick but it doesn't work for the bm6 (only for the bh6, bp6 etc. - how annoying is that!!)

I've heard that the celeron 700 uses a higher voltage by default (it might be as high as 1.7 - i can't remember where i saw it), but abit may take this into account in the next bios update for c700 support(?)
If they add c700 support (say at 1.7v for argument sake) does that mean that they will make voltages upto 1.9 available in their +0.2volts rule??

Hopefully we'll find out soon.

 

[kwg]

Unfortunately I am now pretty sure the voltage trick only works on slotone mboards.

For the BM6, ZM6, and BP6 PGA socket mboards, the BIOS samples the VID (voltage ID lines) which come directly from the CPU. The BIOS uses that def voltage and adds 0.2 for the max user-defined voltage.

The jumpers on the slocket supply the VID, which becomes the default voltage.

VID
---
2.0V all PPGA [2.2V max]
1.5V FCPGA 533, 566 and 600 [1.7V max]
1.65V FCPGA 633 and up [1.85V max]

For in-depth info:
ftp://download.intel.com/design/celeron/datashts/24365812.pdf

 

[Compnut]

The only way to get higher core voltage on the bm6 is to connect the apporate vid pins on the back of the mob to vss. See pages 18 and 57 of the celeron data sheets. pin vid2 is connected to vss thru the cpu on fc-pga cels so that one cannot be changed unless you won't to remove that pin from the processor. If you connect vid1 and vid0 to vss the comp boots at 1.65volts and you can go up to 1.85 volts. If you connect pin vid3 to vss It boots at 1.85volts and you can go up or down from there.There is a vss pin right next to the vid pins so it is easy to connect the approprate vid pins to it Just be sure not to bridge over to any other pins. I used a very small wire and a mignifing glass to connect the pins. Some have just used solder. My celeron 533mhz fc-pga cpu will run at 920mhz at 1.95volts but would only run at 820 at 1.7volts. Of course if you run the cpu out of spec. you run the risk of burning out the cpu although I have never known anyone to burn one. Be sure and use a good heatsink.

 

[dandan]

do you have any pictures for how to do this?
my cel533a will run 880mhz fine, through hours of q3 and q2paintball.
and at 896 it will run everything but q2 and q3.
but alas, im stuck with 1.7volts.
i have done some fine work on many playstations with mod chips but never on a cpu or motherboard. so i think i have the tools but not the fine directions. if you could help on the directions or pictures, that would be great.
thanks
dan

 

[rigor]

Would it not be right that someone who has done this 370 socket hackery, could "SAVE" their bios to a file, with the 1.7-1.9 voltage range default, and then provide it to others who don't feel like hax0ring their mobo to accomplish this? I believe the Bios SAVE feature works on the abit. Person who has gotten the BM6 into the 1.7-1.9 simply saves their bios, everyone else simply loads that bios in? NO?

 

[rkoelewijn]

Thanks Compnut, i had overlooked the vid3 option. But how did you overcome the vid2 pin, on the celeron the pin is grounded. In order to get 1.85 V the pin should not be connected, otherwise the motherboard will detect 2.05 V !

i don't think saving the bios will help, because the bios doesn't use the cpu info when setting the vcore, it just checks the vid pins. The hardware modification is the only way to go, or someone has to modify the bios

btw i'm in the process figuring out how to modify the bm6 to readout the core temp. diode of the celeron II. This weekend i will implement the modification

regards,

Roberto

 

[aardvark]

Can you keep us informed out how it goes - i need more speed!!!

BTW how difficult can it be to reprogram the bios to give the extra voltage? - i say this with no idea at what this may entail. There must be some clever b*stard out there that can do it.

cheers

 

[Compnut]

If you connect pin vid3 to vss it initally boots up at 1.85volts but the default is 1.9volts. Voltage range is then 1.3 to 2.1volts. My 533 fc-pga runns stable at 896mhz and 1.9volts. Will run at 920mhz and 1.95volts but not completely stable, plays Q3 ok but eventally locks up playing unreal. Ambient temp was 85degf and the cpu temp was 109degf. Might run ok at lower temps. Using a global winfan, copper shim, radioshack heatsink compound and 80mm cpu fan, two 80mm case fans.

 

[Compnut]

I don't have any pictures but if you look on cel data sheet page 57, 5.2.2 right top corner you will see the pins that are right together with a vss pin. All you have to do is connect the approprate pin to the vss pin The view shown is a pin side view so it is the same as looking at the bottom of the mob.

 

[Sesopedalian]

I have the HL bios on my BM6. The user defined voltage goes from 1.3 to 2.3. Has anyone confirmed that the Celeron 566 or 600 will not work on the BM6 with that bios? I have a Celeron 300 ppga at 472 on this earlier BM6 board.

 

[dandan]

compnut,
you dont happen to have a link to that doc.?
i was looking last night, and the site was so slow.
and if any one can save or hack the bios to give out,
PLEASE let me know also. all i need, i think, to get to
896mhz stable in games is 1.75volts. quake will run fine for a few min, then lock up. all i do in win2k is end task on it and all is good again. my temp is between 45-50c.
im so close.

thanks
dan

 

[dandan]

Sesopedalian,
with my cel400 i could go up to 2.3 volts
with my cel 533 i can only go to 1.7 volts
both with the QT Bios.
never tried with the HL Bios
dan

 

[dandan]

i got the pdf file, finaly.
this weekend i may have a little fun.

on another note, does anyone know where to get a copper spacer to place between the cpu and flat h/s with out the little feet?

thanks all
dan

 

[kwg]

This is on hardocp.com:

] When we met with ABIT in Taiwan during the week of Computex we
] asked REPEATEDLY for them to allow the Hard|Core users to adjust
] the voltage settings HIGHER than what is now allowed in their
] BIOSes. We were told this morning that that is becoming closer
] to reality. It seems as if an "ON/OFF" switch can be set to allow
] the end user to be able to activate higher voltage settings.
] Hopefully we will see this soon. I think this would certainly
] give ABIT an edge back into the Hard|Core user market.

 

[kwg]

aardvark,

> BTW how difficult can it be to reprogram the bios to give
> the extra voltage?

It shouldn't be that difficult....disassemble and find the +.2V
comparison limit. The trick is making the checksum, otherwise
you get a (fatal?) error during bootup.

Hopefully Abit will allow the higher voltage in the next release.
BM6/ZM6 is still pending, so there's a chance we'll be first!


Roberto,

> btw i'm in the process figuring out how to modify the bm6
> to readout the core temp. diode of the celeron II.
> This weekend i will implement the modification

Please keep us informed!

Is this similar to the BX6 mod?

 

[dandan]

Compnut

Looking at the pin side view on page 86 of the celron datasheet.
upper right corner.

ftp://download.intel.com/design/celeron/datashts/24365812.pdf



PLEASE LET ME KNOW IF I AM CORRECT IN THE FOLLOWING

so all we need to do, to boot at a default voltage of 1.65, on an Abit BM6 is:

connect the vss pin at(36,AK) (x,y cords listed next to chip sides)
to the VID1 pin at (36,AM) and
to the VID0 pin at (35,AL)

with 2 small wires?

This is delicate work but i think it shouldn?t be all that hard.

Thanks again all,
dan

 

[rkoelewijn]

KWG,

What BX6 mod ?

The modification will consist out of removing the thermistor RT3 under the cpu replacing it with a 3.3 nF capacitor, replacing a 10k (R247 nearby monitor chip) resistor with a 30k resistor and connecting the on-die temp. diode to the capacitor where the THERMDP (pin AL31) is connected to pin 1 of the capacitor (pin 1 is a square pad) and the THERMDN (pin AL29) is connected to pin 2 of the capacitor (is in fact Ground) with some small wires.

I have to implement this modification to test it, but looking at the specs of the W83782D (Winbond monitor chip) it should work.

update :

I'm testing the modification and it's working, however not correct The problem lies in the fact that the winbond chip can be switched between reading a thermistor and core diode. The chip is initialized by the bios to read the thermistor. So looking at the temp. in the bios menu gives a incorrect temp. (and also an alarm !) However using the Motherboard Monitor tool you can select the correct sensor and the read-out of the core temp. is correct. making the modification for me worthwile.

regards,

Roberto

 

[rkoelewijn]

Compnut,

I tested the vid3 connection to Vcc, it results in 2.05 V Vcore seen as default !

regards,

Roberto Koelewijn

 

[dandan]

rkoelewijn

what is the location of the pins that you connected to do this?
looking at the pdf file from intel.

dan

 

[kwg]

aardvark,

Send me an email.
kwg@netzero.net

 

[rkoelewijn]

dandan,

On page 54, table 40 is the description of the on-die diode connection and on page 82, figure 23 you can find the pins in the same corner as the vid pins.

regards,

Roberto Koelewijn

 

[Compnut]

Dan that is correct, some just bridge it with solder but I like to use a fine tined wire and solder it, it is not hard if you sharpen a small soldering iron and are careful.

 

[dandan]

Roberto and Compnut,

thanks for the help.

dan