Precision M6400 Owner's Lounge *Part 2*

That was very easy. All parts are fixed with screws, just take a screwdriver and do the stuff

 

What panels in particular?

 

Hope it helps

 

Seems like you forgot to do the stuff with the clock generator to change the frequency

 

The BSEL pins are shared with the north bridge and the clock generator. If you've done the mod on the side of the north bridge, that's not enough. The clock generator should be set up as well (the FSL pins on it)

 

I see. As far as you know, a logical 0 can be an equivalent to ground. So no matter what voltage you are attaching. It will always stay 0. Whereas it would work out vice versa.
You should do the mod on the sides of the north bridge and the clock generator themselves by disconnecting the CPU's BSEL2 pin from them first. Then send the "1" to that pin on the clock generator and the NB.

 

I guess after the mod you can overclock even more

 

Hey guys! Let me share my mods with you!
Now my M6400 can supply 12V for 3.5" HDD on both HDD SATA ports.
For that, I've got 12V Step-Up/Step-Down Voltage Regulator S18V20F12 from Pololu.
The max output current is 2A which is enough for 2 HDDs. And it has an Enable pin which is quite convenient for shutting the regulator down when the laptop is off because that small device will always stay connected to the battery/DC line.
It fits perfectly between the graphics card and the RAM as you can see. But you should isolate the back side of the regulator and the area on the graphics card and the RAM to prevent possible shorting. The plastic part of the palmrest in that area should be removed.



The other mods voltage regulation for CPU and FSB switch.
For that, I purchased the 8-channel switch and installed it on the right to the DC connector simply because it's the closest place to the voltage regulator and there was a free space under the heat pipe of the videocard there.
First, I removed all the VID pins from my QX9300 and wired out the VID pins to the switch isolating each of them before attaching the next one.
The lower row of pins is connected to 7 VID pins of the voltage regulator and the last pin is connected to the north bridge for switching the FSB. The upper 7 pins are connected to 1.1v for the VID pins and the last one is attached to VCCP. I guess we could supply them all with 1.1v.








The switch is totally safe in terms of mixing up the wires. The probability that it might destroy something in your laptop is very small because the worst thing that could happen is if you set 1.5v for the CPU, it might overheat. But as you might already know, there's a built-in protection to prevent that.
This is the setup for my switch:
1 - FSB switch: ON - 333MHz (FSB1333), OFF - 266MHz (FSB1066)
2 to 8 - left to right VID6 to VID0 to follow the VID table in a convenient way.

This is my everyday setup as you can see on the last picture: FSB 333 and VID 0010110 which is 1.225v. It's working fine for me with that voltage and the temperature is basically the same as for FSB1066.
I'm thinking on upgrading to FSB1600 though
I've tried once but it didn't work out. I guess I should supply the north bridge with at least 1.21v instead of 1.1v originally.

If you want to know more details on the mod, let me know.

 

awesome job man!, how are the temperatures after that?

 

They are the same as no voltage change has been applied.