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Celeron 400... *UPDATE* a good 15% OC!

N

nbarb99

Senior member
I've got a slightly older computer set up for e-mail, etc. I've been wanting to squeeze a little bit more out of it (I *know* it can go higher than stock speed of 400..)

Here's what I've got:
Celeron 400 (assuming it's a Mendocino, Slot 1) @ 66*6
PCChips M767V (yes, it's not the best board)

The mobo does have a "CPU Plug-and-Play" BIOS option (gotta love it) and it will let you set the multiplier/FSB manually. Only problem is it doesn't appear to obey my multiplier adjustments 🙁 It's always detected as a Celeron 400.

The FSB appears to be able to go up in approx. 9MHz increments. (66, 75, 83) Probably more like 9.25MHz.
I haven't tried to do anything with the FSB yet. Well, I did right when the computer was built, but that was a mistake 😉 (tried to set it to 100MHz since I thought the Celeron was a 100FSB chip.. my bad 🙂 didn't post, reset the CMOS)

Any thoughts?
I'll let everyone know how raising the FSB goes..

*EDIT* Update: It's rock solid at 75MHz FSB (75*6=450, a 15% OC). It posts at 83MHz FSB, but refuses to boot into Windows. Probably the memory or the PCI bus that's hindering it there. The memory is actually PC100 (running at "PC75", previously running at PC66), so it might be the PCI bus.

The mobo is a fairly good OC'ing board, wish it would allow 1MHz increments though.. But you can't complain about a free +50MHz! 😀
 
the multiplier is locked on the CPU. As far as I know, no one ever found a way around this.

FSB adjustments are the only way you can overlock that celeron.
 
The Celeron 400 should overclock pretty well. One of the absolute best overclockers of all time was the Celeron 300A, but I believe the models following that should also overclock well.

As stated before, you'll need to OC by the FSB, but your motherboard may limit you depending on how OC friendly it is.
 
Yup, it's great at 75FSB.. (see edited original post) Wish I could edit the multiplier though.
Don't quite know why it's not loading Windows at 85MHz 😕
 
That's a good OC Assimilator1!!

I'm going to try and get my Celeron 400 to run at 100MHz FSB (600MHz! 😀) It won't post at 100FSB but the board is designed for 66/100 FSB so I probably just need to give the CPU a bit more voltage.

No idea how to do that 😕 There isn't a voltage modifier in the BIOS, and I don't think there's a jumper on the board 🙁
 
Your SHOL then I'm afraid ,thats the only places you could of adjusted vcore ,unless you were using a slocket which had vcore jumpers.

Btw the Medincino (spelling?) core (Cel 300A-533) generally topped out at about 450-550+ MHz ,with earlier Slot 1 cpus mainly at the lower end of that range & latter S370 from the middle to the upper end of that range.

Yeah this little baby overclocks nicely😀 ,when I 1st bought it just over 4yrs ago I couldn't believe my luck that I had got such a good chip🙂.
On my old Soyo mbrd which had 105MHz FSB it would hit 578MHz with 2.15v ,though only with a HD HSF ,the retail HSF limited it to 550MHz @2.1v.On the bigger HSF it ran at 2.05v @ 550MHz.On std vcore of 2v it wasn't stable above 95MHz FSB (523MHz)

Your chances of hitting 600MHz are very slim I'm afraid ,& virtually impossible if you can't up the vcore & you have a 'std' HSF🙁

Good luck anyway🙂
Inccidently ,if you find that at 83MHz FSB the data on your HDD is getting corrupted try turning off ATA33 so it runs at PIO 4(?) ,this could often allow the HDD to take higher PCI buses🙂.Note you will loose a little HDD performance ,depending upon size & speed of your HDD
 
Originally posted by: nbarb99
Actually I found a way to modify the vcore:

[L]http://www.geocities.com/celeron_overclocker/voltage2.htm[/L]

Going to try it at 2.2V.. I'll keep everyone posted.
Click to expand...
Ah ,actually I knew about that 1😉😛 ,I didn't realise you had a Slot1 cpu ,I'd assumed you had a S370 variant, I hadn't read your 1st post properly! ,my bad😱
Definitley worth trying 2.2v ,I hope you've got reasonable cooling though & not just the std retail HSF!
Good luck🙂

 
Well, I tried the "nail polish" trick and it finally brought it up to a Vcore of 2.2, but it didn't POST at 100FSB. 🙁 Maybe 2.4V will do the trick 😛

Anyway I'm done messing with it for tonight! 😀
 
I'd be very careful with 2.4v btw! ,you need really good cooling to avoid frying your cpu!:Q

You haven't mentioned what HSF you've got ,what is it?
 
I had 2 400>600 in a BP6 back in the day.

😀

400s that will do 600 are rare. 366>550 & 300a>400 were the most common overclcocks.
 
Ah, that makes sense addragyn. I think maybe this chip isn't going to make it to 600.

BTW, I have the stock heatsink with a 80mm fan blowing over it. Temps rarely get over 30C/90F. Of course, I'd need bigger cooling for 2.4V operation 😉
 
Yeah you'd probably need a bigger HSF ,probably not worth the expense especially when 600MHz isn't gaurenteed

Originally posted by: addragyn
I had 2 400>600 in a BP6 back in the day.

😀

400s that will do 600 are rare. 366>550 & 300a>400 were the most common overclocks.
Click to expand...
I think you mean 300A @450MHz😉
Btw ,nice overclock you had!:Q🙂

 
When i had my Celly 400, i ran it at like 600mhz all day.. what you need to do is to run the FSB at 100mhz, and see if you can find a proper divider to keep teh PCI bus at 33mhz (it shoudl be in there if your board supports 100mhz P2 chips).



Hess
 
The board should be able to handle 100MHz FSB since it's advertised as a PC100/66 board: http://www.pcchips.com.tw/M767v.html

Either the board is slightly defective and it just doesn't like a 100MHz FSB, or my particular Celly isn't cut out for 600MHz. *sigh*

I'm actually thinking the board might be the problem, since I tried another Slot1 CPU (600MHz Katmai) and it wouldn't post. It's hard to tell though, since that CPU is possibly damaged. Wish I had a 3rd Slot1 CPU to test.. then I could know for sure.
 
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