I think these are my final thoughts about overclocking my PII 945.
I have made a lot of tests (taking into considerations all of your precious advices - thanks a lot Mastiffman and Morheen!!! and others
So, what I have tried to do first is to follow these steps that Mastiffman sent me...:
1) finding my MAX HT Reference Clock which is 360 MHz
2) Max CPU frequency = the highest (unstable) frequency was 4005 MHz
but with some ridiculous voltages so, I think the highest stable freq would be sth around 3.8 GHz but I prefer 3741 MHz
(you'll find all the settings in a spreadsheet I've created below)
3) CPU-NB freq = highest was 2650 MHz
(quite hard to stabilize this one - needs quite a lot of voltage)
4) RAM frequency = uff 1767 MHz
(but you'll find my question about it below). What I can tell you that I personally think that memory limits my highest OC result
(I don't know maybe it's a RAM itself or just weak IMC) So, highest stable was 1720 MHz
5) Lowest Stable Ram Timings = I have tried everything and no matter what it's only 7-7-7-20-27 1T (with RAM divider 1:3.33) and RAM speed 1720 MHz
Ok! So, here are the results:
And now please take a look at all these values and tell me what do you see
My main goal was to achieve the highest CPU-NB value and RAM frequency without some ridiculous voltages.
This is good - if you take a look at Multistep OC Booster cells and values, changing that changes everything.
Could someone explaing to me why I can run stable:
CPU = 3710 MHz
CPU-NB = 2650 MHz
RAM = 1767 (wow)
...but this was with Multistep OC Booster set to Mode 1
with so little voltage...
and need a lot of voltage to run stable:
CPU = 3741 MHz
CPU-NB = 2580 MHz
RAM = only 1720
This is the thing that amazed me a lot! To run 3741 MHz - cold boot
I needed much more voltage than to run 3710 MHz (but in Multistep OC booster set to Mode 1). Unfortunately I couldn't make a cold boot with this second setting but after my OS has loaded it all seemed to work just fine
Another question: is running CPU-NB = 1.44 V (under load) in everyday use is safe or I need to lower this value? (in Bios 1.39 V)
The toughest task for me was to stabilize or to find optimal value for CPU-NB frequency and voltage. What I have noticed is that is very important to keep these voltages as low as you can - IMC is in CPU yeah?... so, a temp of CPU raises up when you bump up CPU-NB voltage and that "prevents" to get higher OC (wow... didn't know that I am so smart
: my batch number is 90036
- I don't really know what this number indicates (is there any table or spreadsheet with batch numbers that are good for OC?)
ufff... so, now a few words from all experts and non experts - i will be very grateful if someone is capable to give me any additional (and useful of course
advices and hints.