Had chance to look at the adjustments I made in the bios.
All changes are in the 'Ai Tweaker' section:-
(reading top to bottom of that page)
Ai Overclock Tuner..... Manual
CPU Ratio Sett...........Auto
FSB..........................445
(Obviously you set this to the fsb that you hope your chip/board can cope with- a setting of 400 should be good to start with, although one cannot say for sure!)
PCIE Strap to ............Auto
DRAM Frequency ........DDR2 - 1069
(the above provides a no. (about4/5) of ddr2 speed settings that the board can auto give you - basically dividers - the actual speeds offered are dependent upon your choice of FSB . Best to err on side of safety to begin with i.e. if your ram is suppossed to run
@1066 pick the nearest speed available BELOW 1066 - you can always adjust later ; as I have 1069 is o'k for me but not the next one up which ,if memory serves me correctly, was about 1100. You are not , I believe, obliged to choose one of those on offer it's just a hell of a lot easier!)
DRAM CLK...............Ai.. Auto
....".......................A2..Auto
....".......................B1..Auto
DRAM ....................B2..Auto
DRAM Timing Control - I have this set at 'Manual' and have then put in my rams actual timings. Your choice of course but to start with would probably leave at Auto (change it later if need be) - My rams timings as shown being:-
Cas # latency:5
Dram Ras# to Cas:5
Dram Ras#Prechge:5
Dram Ras# to.......:15
Auto for next 21 entries !! - hopefully I've counted correctly but the last entry in this first section of Ai should be ' Ai Transaction Booster ...Auto'
Next Section
CPU voltage : 1.18125
(Obviously you need to adjust this to the more or less lowest voltage that you can with everything stable BUT to start with you could leave it on Auto as you can then be sure that (assuming your board complies with the usual Asus Board tradition) the cpu will be given more than enough volts and later ,assuming ok at Auto you can then try to find the lowest stable point , starting at ,say,the chips vid)
Apart from 'Dram Voltage'- which needs adjusting to your rams required voltage (on mine it's 2.1v) - all other entries are left at 'Auto'
I hope the above is helpfull
Lastly just to mention:-
1. As advised previously would strongly recommend that you use only 2 sticks of Ram to start with.
2. If it's stable with 2 but falls over with 4 it's probably not enough voltage to northbridge problem. I DO NOT KNOW where to increase/decrease the voltage (never got an answer to that ?)
3. Be very wary of the board overvolting the northbridge!! - Although I've never been able to find out what voltage is being pushed through the Northbridge (and even if I did , as I have no idea what the voltage SHOULD be it would not be too much help) I kept a very carefull eye on its temperature for a few days to be sure it was not overheating (simple hand on bridge - did it feel hot - no- so ok-approach)