790i reference board volt mods (UNCONFIRMED mods) >> work in progress

dinos22 · 03-23-2008, 05:37 PM

Hi guys

i would like to start this topic to get all these mods confirmed first of all but ppl here that are more experienced. i've worked with simon (oohms) on these but because he didn't have the board on his and pics only these mods may not be correct. Vince found a droop mod but i could not get it working with a pencil mod

i need to solder a 50K VR and check it (that's basically the only mod i'll need as bios has all the options i need)

actually maybe the DDR3 VTT mod may be useful if we can get it confirmed

WARNING: UNCONFIRMED MODS. IN TESTING STAGE AT THE MOMENT

I'll ask Simon to chime in what feedback he requires as i am not trusting my multimeter for resistance readings

DDR3 VTT MOD(unconfirmed/untested)

VCORE READOUT(haven't checked yet >> someone pls check and let us know)

VDIMM MOD(unconfirmed/untested)

VNB MOD >>> tested using 20K VR (be careful here though and make sure your VR is loosened up all the way as 20K already boosts vNB by 0.05v at stock VR resistance)

VCORE & VDROOP MODS
>> VCORE MOD confirmed working >>> USE 100K VR to be sure....even 200K if required.....you could use as low as 50K but start high first as not all boards are the same
>> VCORE droop MOD confirmed working >>> USE 50K VR .... also may be able to use a smaller VR as one user is reporting around 2-3K reading after dialing down 50K VR to control droop properly

as you can see none of them have resistance readings (besides vdroop) yet so i need ppl to do the readouts on their boards and report

if anyone does test these please report your findings or if you have alternative points let's get them up here and test out make sure they work 100%

dinos22

oohms · 03-23-2008, 10:27 PM

Hey the NB mod is wrong.. ill send you an updated pic

metro.cl · 03-23-2008, 10:33 PM

Nice to see a thread like this

from what i've seen vdimm is the most needed

dinos22 · 03-23-2008, 11:51 PM

ok here is the updated vNB point

i will test resistance later
would appreciate it if other 790i owners can do the same

boqonx · 03-24-2008, 07:10 AM

It makes a lot of sense for the VDIMM, according to the datasheet in pg.1 specifically said that it's typically used for DDR/DDR2/DDR3 SDRAM Bus Termination Supply.

sonofander · 03-24-2008, 07:26 AM

if somebody explains how to do the vdroop mod to me, I'll try it out on my board

sonofander · 03-25-2008, 05:57 AM

anybody??? someone help me with the vdroop mopd please. I've never done anything like this before and the above pic is a little less instructive than I would prefer...

dinos22 · 03-25-2008, 06:31 AM

u see the pic with the vdroop mod

well what you need to do is use a 2B pencil and basically draw a line between the two points (the blue lines in the image are showing the two points you need to connect with 2B pencil)

it did nothing for me though so i have to solder a 50K VR and see if that changes anything for me

sonofander · 03-25-2008, 06:54 AM

Ok, well I'll pull my board and give it a shot today. Let you know how it goes

Kabauterman · 03-27-2008, 02:53 AM

for VDroop is 50kOhm VR needed?
I can't read it right.

dinos22 · 03-27-2008, 02:59 AM

that's what it's supposed to be

xbrian88 · 03-27-2008, 07:21 AM

dinos22 CONFIRMED MODS???

Pedropc · 03-27-2008, 08:23 AM

dinos22; Instead of with a pencil 2b, can be done with silver paint?

boqonx · 03-27-2008, 09:07 AM

The silver paint would probably pull the resistance all the way to zero, you probably don't wanna do that.

dinos22 · 03-27-2008, 02:44 PM

Quote:

Originally Posted by xbrian88

dinos22 CONFIRMED MODS???

no not confirmed

fornowagain · 03-27-2008, 02:50 PM

Quote:

Originally Posted by Pedropc

dinos22; Instead of with a pencil 2b, can be done with silver paint?

Probably not a good idea.

dinos22 · 03-27-2008, 04:41 PM

Quote:

Originally Posted by boqonx

The silver paint would probably pull the resistance all the way to zero, you probably don't wanna do that.

errrr don't use that man
the idea behind pencil mod it to put a weak link to reduce the resistance slightly

even when pencil modding you have to be careful not to overdo resistance too

from what KP told me (relying on my memory here lol) he dialed it down to around 30K