Celeron 850 cDo

[slick306]

Hey, I have a Celeron 850 cDo, and I currently running it at 133x8.5 for 1133mhz, at 1.600v. My system is completely stable. I have a bh6, and it is a rev 1.00, so I don't have any higher bus speed than 133mhz. I was wondering what you think my chances are at getting 153x8.5 for 1300mhz on a different motherboard? Does it sound attainable? I am only running 1.600v right now at 1.13ghz..

Slick

[Falkentyne]

Let me tell you....
Just because a chip is running at default voltage at 1.13 ghz, doesn't mean that it will automatically have enough headroom for another 150 mhz or even 100 mhz.

Each chip is different, but usually when you reach a certain point, you will need to increase the voltage and/or improve the cooling, to get farther..and the further you go, the more extreme measures you must take. It's almost like a logirthmic curve (?)

Maybe your chip won't be stable anymore at 1.6v @ 1.15 ghz. Maybe that will need 1.65v. Maybe 1.17 ghz will need 1.7v. and 1.2 ghz will need 1.9v. Increase the cooling and maybe you can knock the voltage down a tad. But if this were the case, if you needed 1.8v @ 1.2 ghz, don't expect 1.3 out of that chip without anything except water cooling or > 80 watt peltiers.

That's a great chp, those cD0 steppings are nice, but you never know when the limit will kick in.

My cB0 600e ran perfectly at 866 mhz (144 fsb) @ 1.65v, but needed 1.70 for 900 mhz, and 1.8v for 930 mhz (155 fsb, which was stressing the motherboard too much--was just too unstable...). FWIW, my new 1 ghz/cD0 is doing 1.162 ghz rock solid at default voltage, although the memory controller is slightly unstable, but MORE stable than the 600e was at 930. Note that all of this is with the retail heatsink+fan.

Even though my 600e does 900 @ 1.7, I would not expect 1 ghz out of it with anything outside of extreme cooling.

But go ahead and get a new motherboard with more FSB selections, you will be glad you did.

A BH6 1.1 would allow you to go to 155 FSB with a 1/4 PCI, much better than maxing at 133 FSB with 1/3 PCI :)

Good luck :)

I suppose when a chip needs higher voltage at a very high FSB, having a flaky memory controller can just make things even MORE unstable, than a chip that can handle that FSB At default. But I'm getting off track.

[Killer Chef]

I have managed to get my cDO 850 to boot and run at 1317 @ 155fsb 2.05 volts, but it locked due to heat and I'm to poor to get another HSF combo at the moment.
In the future I will get a new HSF but at the moment I'm happy to be running rock solid at 1133mhz with no mods at all except for 2 extra case fans.
I'm thinking that it may even go higher but Ive run out of FSB speeds to try out:(

[Lancelot]

I'm sorry but I have a hard time defining your opinion of 'stable' here. Your CPU needs 1.75V default @850Mhz, and you claim it's 'stable' with 1.6V @1133?! Nah! maybe it is when you just surf and e-mail some etc. but did you run any 3D-games for hours etc. or 3D-mark 2000/2001 (I found 2000 locks up earlier). If so you really have a golden sample!

[Ebola]

Lancelot's right.

on my p3 1000e cdo, i can run at default voltage at 1240 but to be super stable i have to kick it up from 1.75 (default) to 1.8.

and windows 2k doesnt like to be overclocked as much either. i've noticed.

[Stealth]

1.3 might be a little to much to expect, but hey you never know it might. in the CPU DB the highest is 1233 @ Vcc 2.0, I don't think I am brave enough to try a Vcc that high. If you got the extra cash I would go for it, worst case it won't go any higher and you still gor a new toy to play with, and yet another extra part to start building yet another system to play with.

[slick306]

Yes my cpu runs 100% stable at 1.600v. I can play any 3d game I want, I play max payne, and red faction. The day after I got the chip, I ran 3dmark for 2 hours while I was at school and it was still running when I got home, at 1.600v @1133mhz...

Slick

[Lancelot]

ok.

But still I found it hard to believe, lol! Did YOU set it to 1.6V or does it somehow default to that? There's a possibility that your slotket is fooling your BIOS into 1.6V while the CPU actually gets 1.75 or 1.9V. What are your full load temps, honestly?

[stompah]

Plug in Mother Board Monitor to see the voltage while running.... I could be dumb and not ralize that you may have mentioned that you had MBM is so I apologize.

If you got it to run at 1.6v good for you. Try some other burn in programs too. They may be the ones to tell you wether your system is 100% stable at all. I never rely on only one test to tell me if my system/spu is stable. I run 3dmark2001, Sandra's burn-in and CPU Stability test to make sure my system is stable.

Sorry have to go now I will check in later.

PS god chip you got there. I may go pick one up in the future... when its like $30 lol I am poor!

[Falkentyne]

Yes I find it VERY hard to believe you are at 1.6. As others said, you are probably at a higher vcore, but the slotket is tricking the mobo into thinking it is at 1.6. That's pretty crazy to be running a chip that fast, at that low vcore....

[Stealth]

Not always true, I run my celly2 600 cCO @ 945 1.65 without any problems at all. I have a Abit VH6-2 and I set the Vcc myself in the bios, dosen't use a slocket so no tricks