Pencil mod ms7254 isl6566 vdroop how?

[frer8833]

Pencil mod ms7254 isl6566 pwm, bsel mod, vid mod, vreg, vdroop, vcore mod, how?

(I SOLVED vcore 1.4 but the instant i overclock beyond 235 fsb the pc stops working, my motherboard max is 800 fsb but with duo core pentium i could overclock to 280 fsb): I did the correct vid pin mod and raised the vcore up 1.4. If you have sometrhing to say please say it, thanks. http://forum.xcpus.com/f45/lga775-series-vcore-mods-202.html)

My issue now: I have enough vcore 1.4 but computer can't function at above 235 fsb, what is the issue?

Hi guys! Thanks for looking at this post.

I would like to be able to play games smoother and watch movies smoother and i guess having more voltage can get this pentium d945 up from 3.4Ghz to 5Ghz.

How do i do: 1. BSEL mod (does this increase vcore as well?) 2. VID mod 3. Voltage regulator chipset mod 4. Any mod.

The mainboard is from year 2006 and has award-phoenix bios rev 1.05. There are bios updates that i am not sure offers any ability to mod the vcore and also i didn't manage to flash the bios successfully with these updates.

I dont know how to do the vdroop on ms7254 mb. I dont know which resistor to lead pencil. I penciled most of the resistors sourrounding the ISL6566 chip but i didn't pencil any pin on the chip but no change to vcore and vdroop during load or idle. Penciling one of these resistors however makes the PC not booting. So i erased the lead and it booted again.

Vcore range is 1.26-1.185.

The black chip is ISL6566. Datasheet is here:

https://docs.google.com/viewer?a=v&...JaQyWr&sig=AHIEtbQT7R4btucFnBAxHJtkDB47ncmIVQ

Cpu is intel d945 3.4 ghz, dubble core, stock FSB 800 Mhz. Fsb stable up to 231 (it's not above 4Ghz). No option in bios to raise any vcore or anything. This mobo name is also 0A48. It was installed and came with DX2200MT HP computer. I tried to pad mod the cpu with lead pencil but not successing.

Every help appreciated. Thanks guys. You are free from responsibility.

 

[Bobnova]

Can you take a really close up picture of the voltage controller?
I think that the resistor between ISUM and IREF is going to be the target, but being able to see the controller and traces and resistors would help me.

Now if you just want more voltage and aren't concerned about lowering the amount of vdroop, that's easier. A multi-turn trimmer between the FB pin and ground will do it. The trimmer should be 15x to 20x the resistance from FB to GND right now.

 

[frer8833]

I just realized that it is insufficient voltage which makes my pc instable when overclocking. The thing is i can raise the voltage to 1.4 but it vdroops often to 1.21 and that makes it very unstable. I have to stop the vdroop. How?

So, i'm going to pencil the resistor between ISUM and IREF? There is one resistor which whenever i pencil it makes the pc not booting.

I SOLVED vcore 1.4 but the instant i overclock beyond 235 fsb the pc stops working just like before, my motherboard max is 800 fsb but with duo core pentium i could overclock to 280 fsb): I did the correct vid pin mod and raised the vcore up 1.4.

My issue now: I have enough vcore 1.4 but computer can't function at above 235 fsb, what is the issue? I think it might be the hard drive because i get ntoskrnl.exe error when i raise the fsb above 231. It's a read and write memory error.

Or: It could be my chipset, i don't know which model, that can't allow higher fsb than 231 something, but can i fix this somehow?

Or: I also read abour increasing CPU-NB frequency along CPU frequency. I never did it.

Thank you Bobnova and i hope we overclock the pentium d945 @ 5Ghz.

FIRST: Where is FB pin's resistor and where is FB pin? Where is ground? And where is the resistor between ISUM and IREF? Can you paint arrows to or encirculate them using my pic? The chip's name is written on its roof although not visible in the pic and it's not upside down or from the side as you look at it.

Must i connect the entire roof of the resistor with cable from trimpot, or just any end? Can't i pencil this resistor instead?

I found this link about same chip http://www.techpowerup.com/articles/overclocking/motherboard/140/2 where the author talks about the FB pin's resistor to GND method.

GNDs: Is GND the roof of the chip (according to the datasheet?) On other forums some say ground could be the PC case or a motherboard screw. Can i use the negative terminal of any battery as GND? Do you know better options? Can you show the procedure of putting a potentiometer between FB pin and GND?

VCORE: What is the resistance between FB and GND? Is it safe to guess it to around 4k because the author in the article uses 2x50k trimpot? Are we aiming at 1.5voltage or how much? Is 1.5v good for both cpu and motherboard? Should i do something to the underside of the mobo?

I may not have the skill to solder. Can i use this product instead to connect a cable to FB pin and GND?: http://www.ebay.com/itm/Mini-Z-Xmod...810?pt=LH_DefaultDomain_0&hash=item35c2d0ca12

Thank you Bobnova and everyone helping me overclock the cpu @ 5Ghz

PS: http://www.411overkill.com/viewtopic.php?f=140&t=7636 pentium d945 @ 5Ghz vcore 1.5 http://www.overclockers.com/intel-lga775-pad-modding/