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Pin modding a 1000MHz Tualeron - need advice

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First post, by kanecvr

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Hi guys. I've had a 1GHz Tualeron for a while (1GHz 10x100Mhz 256k Celeron) and no board to use it on. Since I don't want to spend 15$ + 30$ shipping on a slotket, I decided to give the pins on the Tualeron a little trim so it will work on my ECS P6VXA - Apollo 133PRO MB. I used this as a guide: http://home.arcor.de/frogge/pepper/tua/tuareport1.html

Guess what - it works! The machine posts at 1000MHz IDing the CPU as a Pentium III 1.0. I also forced FSB 133 from the motherboard's jumpers, resulting in 1333MHz. The board now sees the CPU as a 1333MHz Pentium III-B. I booted into XP and ran Aida64. FPU Julia is 308 ponts, a full 100 points faster then my PIII 1.0B. Here comes the problem:

The CPU voltage is set to 1.93v - that's 25% over the CPU's recommended voltage of 1.45V. I found several mods that should drop CPU voltage down, but they are a pain in the ass to make. Do you think I can leave it at 1.9v w/o killing it? Or should I mod the voltage as well?

Reply 1 of 9, by kanecvr

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Update - well - I decided to do the voltage mod, but it doesn't work. BIOS still reports 1.9v regardless of what pins I bridge...

does anyone know of another way of reducing the voltage?

Update 2 - ok - so after a little 3Dmark01 (DAMN the tualeron is fast at 1333!!!) the Mainboard ramps up the vcore to 2.19v witch makes the machine crash... 🙁(( I can't run the CPU w/o a way to reduce core voltage...

the bios offers no such setting (as expected) and there are no jumpers on the board to control voltage. Now here comes the big question - is there a way to force voltage down to at least 1.65v by modding either the mainboard, the BIOS or the pins on the CPU? Please share... I REALLY want to use the tualeron w/o killing it...

Reply 3 of 9, by kanecvr

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yup. On Coppermine CPUs voltage reading is normal. My 1.75V 1GHz PIII-B works at the correct 1.75V.

Reply 4 of 9, by Skyscraper

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kanecvr wrote:

yup. On Coppermine CPUs voltage reading is normal. My 1.75V 1GHz PIII-B works at the correct 1.75V.

Maybe your VRM only goes down to 1.5V and your are trying to pin mod the CPU to 1.45V. I would try to pin mod to 1.65V which is a good overclocking voltage and totally safe.

New PC: i9 12900K @5GHz all cores @1.2v. MSI PRO Z690-A. 32GB DDR4 3600 CL14. 3070Ti.
Old PC: Dual Xeon X5690@4.6GHz, EVGA SR-2, 48GB DDR3R@2000MHz, Intel X25-M. GTX 980ti.
Older PC: K6-3+ 400@600MHz, PC-Chips M577, 256MB SDRAM, AWE64, Voodoo Banshee.

Reply 6 of 9, by stamasd

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IIRC I used to run a Tualeron (1100 I believe) on an Abit BH6 using a slotket adapter that I modified. I had no voltage issued that I recall because the board allowed for precise voltage control in the BIOS.

I/O, I/O,
It's off to disk I go,
With a bit and a byte
And a read and a write,
I/O, I/O

Reply 7 of 9, by kanecvr

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vcore is not adjustable at all on this board. Neither by jumpers or bios.

Reply 8 of 9, by alexanrs

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Can the BIOS be modded in anyway? Like how you can unhide options in Award BIOSes with MODBIN?

Reply 9 of 9, by kanecvr

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I did load the bios into modbin, but there are no such settings 🙁 - I'll try sourcing a motherboard that can control voltage from bios or by jumpers. I have an Asus CUVX-M, but I don't remember seing voltage settings anyware. I did see voltage adjustment settings on my soyo boards (one intel, one VIA) but both of them are slot 1 and don't seem to support Coppermine CPUs let alone a Tualatin....

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