Overclocking QX9650 on Asus P5G41T-M LE

[THX-UltraII]

Hi,

I just made a good deal on a QX9650 processor which has an unlocked multiplier. This is great for my Asus P5G41T-M LE which seems to have a limitation of the FSB of 399 (I used to own a Q9450 and with my board I just could not get the FSB past 399 no matter what I did with voltages etc.).

I m on watercooling so I want to give 4.0Ghz a shot with the QX9650. What I want to know is how to do this so I have some questions about this


1. CPU VID
With the QX9650 an option comes available in my bios when changing the multiplier from it s default 'auto' setting to a manual multiplier. This is the so called CPU VID which can be set from 1.1375V - 1.6000V. Can someone tell me what this does and what recommended voltage is to set it on looking at my goals of 4Ghz? And also what the maximum safe voltage is to put it on?

2. FSB
What the best/highest performance value to put the FSB on (in my BIOS the FSB is called CPU freq):

333 (default) with multiplier 12 which results in 3.996Ghz
348 with multiplier 11.5 which results in 4.002Ghz
363 with multiplier 11 which results in 3.993Ghz
380 with multiplier 10.5 which results in 4.000Ghz
399 with multiplier 10 which results in 3.990Ghz

I know these values also have their influence on the speed of my DDR3 memory, 2x2 GB Kingston KVR1333D3N9K2/4G. (With my previous q9450 I owned I ran my system on FSB 399 with x8 multiplier (3.2Ghz). With this setting my memory speed was 1596Mhz and it was stable).

3. MEMORY VOLTAGE
I can set this from 1.21000 - 2.47000. I assume it will depend on the FSB I choose if I can leave it on 'auto' (default) or increase it to max. 1.6-1.7?

4. NB VOLTAGE
I can choose from 1.12500 - 1.51875 for this. What does it do? What would you guys recommend with the goal (4Ghz) I have? And what the max safe voltage?

5. VTT VOLTAGE
I can choose from 1.20000 - 1.59375 for this. What does it do? What would you guys recommend with the goal (4Ghz) I have? And what the max safe voltage?

6. CPU OVER VOLTAGE
I can choose from 0.01000 - 0.63000 for this. What does it do? What would you guys recommend with the goal (4Ghz) I have? And what the max safe voltage? Also a not selectable option called 'Offset Sign' appears with a '+' when switching from 'auto' to manual.

7. SB 1.5V VOLTAGE
I can choose 1.5V or 1.6V. What does it do? What would you guys recommend with the goal (4Ghz) I have?

Thanks for all input!


Hardware/Software:
Asus P5G41T-M LE with 0901 firmware
Intel Core2Quad QX9650 with unlocked multiplier
2x2 GB Kingston KVR1333D3N9K2/4G
MSI GTX460 Cyclone 1GB GDDR5
OZC ModXStream Pro 600W
W7 64-bit

Some screenshots:
http://imageshack.us/gal.php?id=sZankp2jl56plqeVm6qbnauZo83b2pU

 

[4Ryan6]

The majority of these questions you can just forget for the time being especially anything you think you learned with the Q9450 FSB overclocking that you're trying to bring to overclocking the QX9650.

You'll only need to manually set your vcore, to supply enough voltage to support a higher multiplier and leave the other voltages on Auto and increase your multiplier/vcore, it's the simplest overclocking you'll probably ever do, any questions?

 

[Marctraider]

I just got a Q9450 and trying to overclock it to a nice 3.8GHz±

So far I managed to get a Stable FSB at 485MHz with some GTL tweaking/clock skewing and got the processor to 3.6GHz with only 1.168v.

From my own experience, its never a good thing to leave voltages at 'Auto' when going over the maximum standard FSB for the processor. Some boards tend to increase the voltage significantly with alot more heat and possibly more wear on the individual components, completely unnecessary.