I had no problems with OC Cel800 so I bought Tualatin 1400

[Chrisu]

Welcome...
I have a problem and I don't know what to do... What is my problem? I had Celeron 800 @ 1200 (stable). So I decided to change it. I've bought Cel 1400T. After the first tests at default settings I started to O/C it. 110 FSB (3:3:1 - FSB:Memory:PCI), POST OK, FSB 120 (1.7V) (4:4:1) - Black screen :( (no HDDs, no CDs and others). Hmmm... That's not good :(. But at FSB 120 with 3:3:1 setting it works... It even started @FSB133 and 135 but on 3:3:1 (44 MHz for PCI that's too much I think ;) ). Stable in windows it works @FSB 103 MHz (1.6V)...
I put back my old celeron (800), because I thought that it's a problem of a new BIOS (9P). But the 4:4:1 setting works on that CPU. With a new BIOS I even run Cel800@1344 (only POST). Previously it started only @1272.
I put back my new CelT and then I realised that in BIOS shown multiplier is... 7.5!!!
Now I don't know if my problems are just because of a ill-lucky chip, or I have problems with my mobo. I decided to change it to CelT 1300. I hope that's a good decision...
I was looking in CPU database here and there are only 4 records with celT 1400. Does anyone had such problems as I (especially with that 4:4:1 setting)? Is there any solution? Please help me...
Now what's in my case:
Cel800/CelT1400, Abit ST6-R (BIOS 9P), 512 MB SDRAM PC 133 (works stable @150), GF2, IBM DTLA 305020, Seagate ST34311, Vortex1, CD, CDRW...

[JCLW]

What stepping was the 1.4?

Maybe it was an early chip that didn't o/c well.

- JW

[ol' man]

You got that chip to post at 1800+ MHz? That is a great chip if it can do that.

You never said what happend at 133 4:4:1.

Of course on most occassions 120 4:4:1 is not going to work.

Did you try 133 4:4:1?

I have ran my PCI to 48MHz on the ST6 before.

Maybe try a older bios? I have had weirdness happen to me like that too. I used to run a 1.2GHz cel-t @ 1.8GHz with cryo cooling.

Try different ram slots. I have noticed that OC'n is not as good in the first slot. I usually ended up in the third slot.

More CPU juice should not affect the fsb dividers(331,441 etc...) any.

Is this a tB1 stepping?

At 135 in bios you would be botting at 136 in reality which gives 1.9GHz. That is AWESOME if you can boot at that speed. What were your voltages for this?

Don't say 1.675v? I will have to go clean up my drawers.

To boot @ 1.9GHz and 1.675v would be nothing short of spectacular.

I would say do not get rid of that 1.4 cel-t. If anything maybe I would buy it off of you. It must be a tB1 stepping.

[Chrisu]

Thanx JCLW.
Family 6, Model B, Stepping 1, Ext Family 0, Ext Model 0, Revision tA1.

And what's the problem with this setting 4:4:1 (doesn't boot on this setting) and with showing of this multiplier (7.5)?

[Chrisu]

I have written my post too long and I didn't know that you wrote sth ;).
Yes I've tried @133 MHz with 4:4:1 (even @ 140) -> Black screen

Using my old Cel800 it works @120 with 4:4:1 (few months ago I had very bad RAM PC 133 that worked with settings 2-2-2 5/7 stable to 120 MHz...)

I've tried with my old BIOS (7T) - the same...

4 different RAMs, every slot tested...

I've tested it with 1.7V voltage.

P.S. After I red your post I've tested it again... Strange things happend... 120 MHz (3:3:1) POST OK (all drives disconnected). 133 (3:3:1) - Black screen... 135 MHz - the same. I don't really know what's going on...

[JCLW]

120x14=1680 is probably near the max you'll be able to run that chip.

Try working it up one or two mhz at a time. My guess is 124x14=1736 is probably about as high as you'll get on air.

I don't remember what the ST6 BIOS looks like - we've got one at work as a server but it doesn't ahve a screen or keyboard or anything. Does it tell you the multiplier or does it just have a greyed out box where you could pick one if you had an unlocked CPU?

133x14=1862 which is pretty ambitious. If your chip would boot at that speed IMHO you'd need at least 1.800v+

- JW

[Edward2]

I have 3 Cel 1.4T's and all of them will do 115 with approx 1.525v. They will boot into Windows at 120-124 FSB with 1/3 divider and about 1.625-1675v, but I cannot get them to be stable at those speeds. It didn't appear to be a heat issue, load temp of 40-44C with AX-7 and TT SF II.

Also, I could not get any of the chips to boot using the 1/4 divider at 124 and up FSB. I agree with JCLW, try upping the FSB in smaller increments and see how high you can get stable.

[ol' man]

My experience tells me that if he can hit 1.9+GHz on a windows boot at 1.7v he can hit higher than 1.65GHz.

I have played with a bunch of these cel-ts and PIII-t tualatins and usually they will run stable 50~75MHz lower than what they will boot windows at.

That is amazing that he can boot windows at 1.9GHz(14*136fsb) and 1.7v.

I know with my ST6 at 135fsb setting in the bios equates to a true 136fsb in reality.

Have you tried 4:3:1? That will run the ram at 3/4 fsb speed.

[Chrisu]

Yest I've tried 4:3:1, but I ve black screen. It looks like there is a problem with "4" divider for PCIs. Very strange is that the multiplier of this CPU is shown as 7.5 (when BIOS settings for CPU are set as "user"). Thanks all for help. I'm gonna change that CPU. It will probably CelT 1300 or even 1200...

[JCLW]

My TUSL2-C usually black screens with 133:100:33 (CPU:mem:PCI) dividers as well. I don't know why. Maybe it's a chipset issue. It's a pain because I only have PC100 in my Tualeron and it's holding me back. Still, I can't complain - 136 CL2 and 145 CL3 isn't bad for a stick rated PC100 CL2.

IMO as long as you have half decent PC133 the memory won't hold you back at 4:4:1 133FSB so there is no reason you need to use the 4:3:1 dividers anyways.

Did it boot at 133 & 136 or just post?

- JW

[Chrisu]

It was POST of course. Sorry for a little mismatch...
It's strange for me... Once it starts at 136, few moments later it wont start even @125... I'll see next week (or in two weeks) when I change it to CelT 1300 :). I hope that 133 FSB is reliable...

[paulie]

ol' man do you have 1 or 2 sticks of RAM in your ST6? When I use 2 sticks it lowers my oc greatly. But I really need the 512mb :(

[JCLW]

Originally posted by Chrisu
It's strange for me... Once it starts at 136, few moments later it wont start even @125...
Mine does the same thing when I push it too far.

- JW

[Chrisu]

Paulie...
I've got 2x256 MB SDRAM. BUt I have same problems with 256MB...

Can anyone tell me why my BIOS see the CPU multiplier 7.5x? I've the newest BIOS (9P) with support for Tualatin 1400...