Celeron D questions

I have a Celeron D system that I am using to learn the ways of watercooling and to continue my overclocking quests. I posted my initial watercooling questions and failures in this thread, and now that I'm past the watercooling giving me problems, I can move into the overclocking.

My first question is what is the max recommended voltage to throw at a watercooled Celly D? My board can go up to 1.8v, stock is 1.375v. I'm currently sitting at around 1.55v with a CPU temp of 36C.

Second is does anyone know of a good CPU-Z-like program for linux, specifically Ubuntu 8.04? I found one called PerlMon which is decent, but it still doesn't show nearly as much information as CPU-Z. Most of the results I've found on google are either abandoned projects from 3 years ago, or they are programs for KDE, while I'm using GNOME.

Third is what speed do you think I can expect from this Celeron D 310 (stock is 2.13GHz). I was hoping to hit 4GHz and I know my RAM can handle it because it's DDR 533, but I've gotten it up to 3.86GHz (so close!) and it seems to want more juice just to go up a few more MHz FSB. Maybe I've hit the limit? Either way a 1.73GHz overclock is nothing to sneeze at so I'll be happy with it if that's my wall.

EDIT: Changed the stable max clock to a lower value because I was getting errors at 3.93GHz.

I got my 315 to 3.9GHz, it POSTs above that and will run a few things but it usually fails to cold boot or restart.. I have no idea why.

What stepping is it? Mine was a G1.. Oh, and voltages up to 1.6v shouldn't be a problem. Past that you don't get much in return, but they're tough old things so feel free to go for it anyway

No idea what stepping it is... Is that on the chip itself or can I look it up with a program? You're pretty much spot on with the voltage, giving it more than 1.6v is doing nothing. I think I may have maxed it out at 3.86GHz, but it might be worth seeing if I can get a few extra MHz out of it. Is there any way to unlock the multiplier on these chips?

Not that anyone publically knows about

For the stepping, you can either read it off the chip itself through the S-Spec (5 characters starting with "SL") or just about any decent CPU-Z style program should be able to tell you..

I finally found a linux program to show enough information for me to find the stepping. I got the CPUID code (0F49) and matched it to the Intel Processor Spec database and found out it's a G1 stepping, either SL8S2 or SL93R. I managed to get it up to 3888MHz, won't go any higher though. Wish I could get that extra 7MHz FSB to hit 4GHz, but it's not in the cards as far as I can tell. I think it might be the board that's holding me up though, not the CPU. Unfortunately, there is no chipset voltage option, or really many good overclocking options at all. I've been so spoiled by my ASUS and DFI boards.