Asus A7N8X mod

[PMM]

Well since uber bios did now't.....................................

I'm struggling not got suitable tools micro grabbers are too big
been trying for past couple of days to get a good mount point/correct mount point.

but for those intrested plug in CM3708 into google or whatever
download the data sheet then see if you can get it modded

Look near your AGP slot for a 16 pin IC small un if you measure
the voltages you will see 1.6v +- a bit uneffected by AGP bios
voltage changes.

Not sure if I am modding the correct pin I'm using a cap I think
links to pin 11(VFB) but I am either shorting or linking to wrong
part, voltages jump to 2.2 -- 2.3v PC Boots but locks at bios did
manage 1.9xx Volts runs for 10-20 sec then locks.

MOD IT AT YOUR OWN RISK BUT I AM SURE ITS THE CHIPSETS VDD

[HMB]

Sounds interesting, i think i will buy some pomona grabbers/pot and a multimeter as soon as possible. Oh, lets not forget the solderiron

[PMM]

Weeeeeeeeeeeeeeeeee

First off I think I have either a Com port issue or modem Issue
at high speed as previous uses of I.E. on line the system crashed
before this mod and seem still to do it but as long as I don't
go on-line I seem stable @225 got a boot at 230 but it did crash.

** Hexus_Pifast gave me errors at 220 something but has not
this time even on aggressive CPU decode done a simple Sandra
memory burn in for 10 cycles and past

_______All you need to know here___________
Ok I was going for the non soldering option but what the
heck soldered a small wire onto the SMD resistor nearest
pin 11.

Resistance needed seems funny!! but if you use a 2MegaOhm
resistor to ground it will result in the voltage jumping to
1.745Volts (in my case.. will differ. slightly depending on
resistor tollerances)

[edit] **opps sorry I put 1meg above was men't to say 2megohm

[beatnic]

have you got pictures?

[nikhsub1]

Yes please tell us where to MEASURE the VDD and then which pin for the mod!!!! This is great news!!!!!!!!!!!!!

[PMM]

I will do my best to explain in a paint special no camera at mo
give us a bit and I will post later.

Please note the IC is small my micro grabbers were to big its
a small IC as such you need to either solder to a minature
SMD resistor or be bery skilled.

Managed with some 3+volts to the ram to get into windows
at 230fsb managed a Hoda shot and sandra ram shot however
it did reboot after a while I think this is heat related issue if I give
computer a while to cool it goes in for a while but after a bit
reboots....But has yet to trash harddrive which it did before
at 215 onwards.

pics ....>

[Jeff]

Way to go Paul!!!

[PMM]

thanks Jeff

[Jeff]

Does this mean you are going to go sub2??? I'm working on a sub 1.9 atm. As long as she doesn't crash at the 3/4 mark... I should have it.

/Jeff forgets where he is sometimes

[PMM]

you mean sub 1.9 allready did the 2 remember

[PMM]

Originally posted by Jeff

/Jeff forgets where he is sometimes [/B]

LOL too right and thats where ya staying

[Jeff]

I forgot that was you.

So what are you shooting for? 1.85ish? I'm just hoping for 1.899.

[PMM]

And for those who need a diagram again sorry no camera
at present a photoshop special hopefully it gets the message
accross of where all is located. The chip I have highlighted red
is the chip in question and it will say on it [ </>CM3708I ]

[Quest For Speed]

This is great news. Thanx PMM for the great work finding this.

[impulse]

oh i cant wait to try this. Great job PMM. Ill post back tommorow after school how it goes for me.

[sysfailur]

Wonderful! I will do this mod and of course take pics!

[sysfailur]

What kind of 1MOhm VR would you recommend. I only found one 1MOhm VR and it is an audio-taper, which means it's very sensitive... can you link to a better one?

or is a sensitive one good? @ 2MOhm, when you change the resistance do you change it alot to get a higher voltage? Like to 1.2MOhm or are you just turning it to like 1.950MOhm?

When you hit 230mhz btw what was your chipset voltage? 1.745? Stock is 1.6 right? What would you guys recommend as the max? My chipset is pelt-cooled.... so It should be able to handle quite a bit o' voltage.

THANKS!

[PMM]

If you use 2MegOhm you should get 1.745v

I thought to be safe If a fixed 1MOhm + Varible 1MOhm
were used together there should be no going OTT.

As for the type of varible resistor take your pic I'm only
using a cheap small one so accracy not that important

Not sure what resistance its at now but I have the resistor
at half way so its 1.5mohms in theory giving me 1.8v

**My previous plays were a few days ago when I could not
get proper connection resulted in voltages @ 1.925+ volts
but caused lockups -- but I can't say for sure that could be
overvolt protection if any causing it.

I think I am ram related now it needs 3+ volts to hit 230fsb but
after sometime computer reboots I had this before this mod
when I ram the ram at 3+volts but at 211fsb and had sim result
so took mem vmod off that was while ago so mem must be
getting to warm.

This mod is certainly working as 230fsb has been impossible for
me 211+ has caused reboots and 215+ has trashed my HD
everytime.

[/edit] 1.745 got me in at 230 with ram at 3.1+v long enough for
hoda shot & sandra Ram benchmark before something warmed
up and caused crash.

My DMM at stock measures 1.597 so yes 1.6v stock default.

[sysfailur]

*hugs PMM*

Thank you! That's what I needed to know. Gotta go make an order @ allelectronics.com

This is very very good hehe. Finally be able to run some sick speeds

[HMB]

Oh yeah baby, hmm what to do now, wait for asus to release the option in bios or solder myself... hmm, it would be nice to have 3 voltmods on a motherboard

[impulse]

Hey all, just finished the mod, check it out and tell me if it looks right... I wired a 1M ohm resister inline with a 1Mohm potentiometer. Is that correct? Any idea of what types of voltages i might be able to adjust to? I have a multimeter ready to test but im just curious. Sorry if the pictures to big

[impulse]

I tried to get a better picture of the resister soldered onto the smt resistor. Hope this helps a little for those attempting it. It was fairly simple if you are handy with a iron. GL I cant wait to try it out!

[Jeff]

Originally posted by sysfailur
*hugs PMM*

Better watch out sys... we have someone over at TPR that might just get a little jealous at this.

[impulse]

OMG! thank you (x1000) Dude it works great!!! I am completely stable at 211 now, whereas before I couldnt get past 188! ill post some benchs in a few mins. I have to reflash my bios to the new one that allows higher fsb. I am soo happy with this board now. A7N8X is by far the best board now! Heres my sandra at 211

[impulse]

Just a little info for ya. Just finished measuring volts. With the way i have it set up now, If I turn the pot all the way down I get 1.75 volts exactly. If i crank it all the way i get 1.91 exactly. Just a little info for ya's