>> Can you post your hardware specs as I'm very suprised that a C300A won't do 450 Mhz.
>> I have mine running at 504 Mhz for over a month now .
>Celeron 300A
>ASUS P2B
>64 MB SDRAM 8 ns
>State of the art CPU cooler and heatsink ;o) (Don't know the brand
>but I've been told it's a good one from someone who runs his C300A at
>450 MHz with a much smaller heatsink - Anyway my CPU wasn't hot when I
>touched it after trying 450 MHz)
>When I tried overclocking to 450 MHz, the system did its normal
>boot-up sequence, and then it froze just as it usually displays
>"Starting up Windows 98" (or something like that...).
>I think there's all the info you need, but if you need more, here they
>are:
>2 Quantum Fireball HD
>Hercules Thriller 3D AGP 8 MB
>Canopus Pure 3D 6 MB
>SB16
>Thanks for any help!
>A. Renault
You need to bump up your CPU core voltage from standard 2.0v which the C300A runs at.
This is very easily accomplished with an Abit BH or BX motherboard SoftMenu2 in
the BIOS/CMOS which I have.
I bumped my CPU core voltage from 2.0v to 2.3v to get complete stability at 504 Mhz.
If I tried to run at 504 Mhz with 2.2v I would get exactly same problem as you have.
Anyway, your C300A will run at 450 Mhz and above if you are willing to tape some
pins on the C300A to bump up the voltage, you need to do this because your mobo
doesn't have Softmenu core voltage regulator in BIOS/CMOS.
By the look of things you only need to bump up voltage from 2.0v to 2.1 or 2.2 at most.
Intel do not recommend going over 2.3v but overclockers have taken C300A up to 2.5v
with good cooling without any side effects.
There is a excellent article here http://www.bunt.com/~jcoon/celeron/voltage1.htm
with great diagrams on how to tape or nail polish C300A pins to bump up the voltage.
I've heard that nail polish can be used in lieu of tape and works better.
Also, you can go to the newsgroups alt.comp.periphs.mainboard.asus or
alt.comp.hardware.overclocking and post any problems you are having.
I'm 99.9% certain your C300A will run 450 Mhz and above if you tape or nail polish the
C300a pins to increase voltage.
Life would have been much simpler if you bought the Abit BX or BH motherboard...
Let me know if you need any more help........Chatham
PS
There is also a article on Tom's Hardware about what is best material to use
to insulate the C300A pins........Snip
I have read your section on isolating the B21 lead on the Pentium II cartridge. Suggestions
you have listed are: nail polish, electrician's tape, anti-corona dope" high-voltage
insulating paint, model airplane paint, or splicing tape for analog recording cassettes. I
hesitate to use any of these methods because the constituent materials were not specifically
designed for this type of use. Nail polish and model airplane tape may have small
capacitances due to their dielectric behavior thereby creating an unstable electrical joint.
Insulating paints, on the other hand, may have abrasive surfaces that will eventually wear
down the Slot 1 mating connectors. In addition, thermal cycling and pressure may cause the
interface between paints or nail polish and the B21 lead to fracture, causing flaking of the
material. This result could be a short between neighboring leads.
While none of these problems have yet been observed, I have a simple and cheap solution that
may eliminate all these potential issues. The answer? Teflon tape. Teflon is a unique
material that has an extremely low friction constant, excellent dielectric strength (no
leakage current), and is resilient to temperature fluctuations. In tape form, Teflon is
relatively soft and can be easily stretched with ones hands. The smooth, soft surface
eliminates abrasive problems and will conform to the B21 lead/Slot 1 contact. The tape can
be applied and removed very easily unlike nail polish or paint. The operating temperature of
Teflon is roughly -100 F to + 500 F (-70 C to + 260 C) so thermal cycling should not pose a
problem. For an example of Teflon's use in isolating electrical components, one need look no
further than Granite Digital (www.scsipro.com), a premier SCSI cable supplier. Their cabling
is considered the best by many and uses Teflon instead of the standard PVC.
from http://www.tomshardware.com/Celeronto100.html
