Overclocking duron 750 problems

[radeongamer]

Ok the system
750mhz Duron (7.5/100)
Epox 8kta3 w/via kt133a chipset
Thermaltake Volcano II
1 case fan blowing in cool air from front bottom
1 case fan sucking out hot air top middle

Alright my objective is to overclock my 750 to 1ghz. What I want to do is increase my bus speed to 133 so that it is (7.5/133). I set the jumper on my motherboard and checked in bios to see the heat and it said it was running at 36 degrees celcius. Ok so I know my problem isnt that its running to hot. What happens is after it goes through the processor speed check and memory check It starts going unstable. What happens first is that it says this (invalid system disk please replace) so I hit enter and it says the same thing.
I hit enter 3 times and it goes to the Windows boot image. This is were my major problems hit. The image is garbled and the computer locks up. I tried increasing the vcor to 1.850 but it still locks up.

These are the things that I can change:

Auto Detect DIMM/PCI Clk - mine is set to Default
CPU HOST/PCI/SPREAD SPEC - mine is set to Default
CPU RATION - mine is set to 7.5
VCORE VOLTAGE - mine is set to 1.6v
VAGP VOLTAGE - mine is set to 1.52v
VIO VOLTAGE - mine is set to 3.4v

What are some things I can change? Is the harddisk thing normal or not normal? What is this hardisk error a sign of? I need help muchly. Thank you.

[Fiz]

I would try shutting off the "auto detect DIMM/PCI Clk- it may be causing the pci bus speed to be wacky. My thought is that when that is on it may not be switching to the 1/4 divider to run the pci at 33MHZ, instead it may be trying to run it somewhere in the mid 40's, most video cards, hdds, and other stuff don't like a pci that high. Also, what type of ram do you have? Is it pc133 or 100. I also found a little more stability in lowering the VIO to 3.3.

Fiz

[radeongamer]

I have PC-133 Ram

[Hoot]

I would recommend setting the vcore to 1.7V and see if you get further in the boot up process. If that works, then you all set. If you get further in the boot process, only to fail again, try 1.75V and repeat. Note that as you increase the core voltage, the temp will go up as you are dissipating more watts. Let us know how you fare.

Hoot

[Fnomna]

I don't know if you will even read this, but I have a D750 and an Epox 8kta3. I had troubles using 133FSB even at
low multipliers. The problem is that at first, for a split second, the CPU's default multipler and Vcore is used. So, with a 750, it would be 7x133 at 1.6V - highly unlikely.
What you need to do is lower the default to x7 and up the
voltage.

See http://www.anandtech.com/showdoc.html?=1440&p=6

This will give 7x133=933 which should be ok to boot.

Also, first you should boot into windows at a low 7x100,then shutdown and change the jumper to 133FSB and boot.

[Fnomna]

Link :

http://www.anandtech.com/showdoc.html?i=1440&p=6