NF7 rev2 VTT mod need it so bad...

[tictac]

:thumbsup:

[Mickey Padge]

I can confirm the new method works

I took out the old Vdd=Vbt mod and put in the newer mod .
It works just as well , but it appears my board just won't budge over 240fsb no matter what .

Cheers

[uwackme]

Im just concerend the 4th way once again pits 2 MOSFETs against one another.

We need to trace the Vtt signal, does it go to the northbridge? If so how big is the etch? If they used too small an amount of copper, then at high FSB/heavy loads the terminations resistors at the NB end of the transmission line might not get enough current, and the voltage at one end would DIP and lead to errors when you really push it.

I think ABIT needs a design review by a serious engineer. You'd be suprised what differences a little more etch here, and extra cap there can make.

Though at production rates of 1.4 MILLION boards a MONTH every penny does add up fast

[Hell-Fire]

Originally posted by uwackme
Im just concerend the 4th way once again pits 2 MOSFETs against one another.

We need to trace the Vtt signal, does it go to the northbridge? If so how big is the etch? If they used too small an amount of copper, then at high FSB/heavy loads the terminations resistors at the NB end of the transmission line might not get enough current, and the voltage at one end would DIP and lead to errors when you really push it.

I think ABIT needs a design review by a serious engineer. You'd be suprised what differences a little more etch here, and extra cap there can make.

Though at production rates of 1.4 MILLION boards a MONTH every penny does add up fast

Sounds like you are just the guy to help them see the light!!

I have a concern where we are adding the wire between the Vref and Vtt pin as in this pic:



I mean, the Vtt is already getting voltage supply from a point, and now we are introducing another source via Vref. What effects does this have and its not like the stock Vtt signal is just going bye bye here just because the Vref is introduced.

Dont get me wrong, its a brilliant idea when compared to having to cut a trace...but I wonder what long time use will bring. I can see that you have updated the site where you list people who have ahd success with this....has anyone had any serious issues with this mod?

Also, with the Vdd Booster mod, which is basically shoving the 5v rail into that cap, what are the benefits of this? Is it stopping spikes in the Vdd supply?

Thanks.

[STEvil]

What is the voltage of the cap before the booster? If its within .1v of the 5v rail already then its probably not going to hurt it at all.

[DJ_FedAss]

I`ve messured the Voltage, its not the cap its the induktive, and 5.08V on the ATX was also on this point.

But it could be that i`ve messured wrong pin, but i dont think so.

[tictac]

emmm... u still wana cut the trace ha?

ok give me high reso pic on this spot

i will show whicj trace to cut after the vref-vtt mod

cheers

[tictac]

if still want to cut the trace

and for sure this move will void motherboard warranty

cut em up.....

[uwackme]

I take it the Vdd boost mod bypasses the ferrite bead filtering the 5V supply to the Vdd regulator circuit. The bead is to keep noise out, but if the value is too high, at HIGH current demands....like mod'd Vdd setups... it wont allow enough current into the circuit fast enough to meet demand, leading to a voltage DIP at the 5V input of the Vdd regulator circuit.


What etch are we cutting now TicTac? That little 3 prone gizmo is a transistor...a discrete mosfet.... was that supplying Vref on that board? I'll have to pull the back up out again and re-evaluate the Vtt Vref connection.

[tictac]

it is pin 1 of winbond ic

the vbt strenght set by winbond ic

so the vbt mosfet wont have their own volt source anymore

there will be only1 volt source it is Vref no more voltage from vbt mosfet itself...

[centaur]

it looks strange to me, but who cares.......

tictac, you dont recomend new user to try your 4th method.
why? i wont do the old mods, only the new. it looks easy and "safe"

[tictac]

coz i have kill 3 board on the 3rd method...

i dont want to kill more board...

use it at your own risk if u use it...

[uwackme]

I checked both my boards, the Vtt and Vref are equal, and track when I turn the pot. Weird. Unless Im not even LOOKING at Vtt at all, only Vref....but then, this IS what the pot/etchcut are diddling.

[EMPShock]

Excellent Mod Gentleman!

btw, i dont understold it well... was the 4th method (vtt=vref) tested?

[hyem]

EMPShock


I'v test it (the 4th method), and it's work fine, it's the 3rd day from the first time i mod Vref=Vtt, it's fine... but the 3th method VTT=VDD, I'v test it too and is fail, and it's make your VTT mofset on fire... heheheh (I mean Fry...)

[Malves]

Just got 2 NF7's. Finally had the chance to try it myself.

[Dani]

Originally posted by Malves
Just got 2 NF7's. Finally had the chance to try it myself.

Ok, tell us more about those babys
I can see that u have grounded the 3 leg of VR, why?

[uwackme]

What the heck are there 3 connections to the pot for?

Malves pre mod, can you confirm that Vtt and Vref are tied together or not on the boards? And do either track then, after the Vdimm mod?

[pcwhisperer]

Just did Vdimm and Vtt=Vref , looking good so far. Gonne try and meassure now. That little thingie got very hot, i've put a bga sink on it.

[pcwhisperer]

My hands are to shaky, i just messured3.3 rail and the pin next to it schould be vtt or vbt right? It gives me 3.66 for 3.3 and 1.7 for the other. So i gues their tracking

edit: what did i just said Vdim is 3.4 and 3.3 rail says 3.66
At least it tracks the Vdimm correct

[Dani]

Originally posted by uwackme
What the heck are there 3 connections to the pot for?

Have you ever seen VR with 3 connections

[tictac]

my vr got 3 leg

[Dani]

All of my millions pots have 3 legs

I have done now to my new NF7: lapped NB, golden Zalman on SB, high sinks for mosfets/IR, VDD/"normal" Vdimm mod and cut-trace VBT mod, sinked every *ucking mosfet on the board...and now, were can I found Vcore mod for this board

I hope this board can do some SuperPi 32s.

[tictac]

this board bios sux a big time....

ROMSIP mod is not enough...

if i can locate the memory timing table we may have bigger chance to hit higher fsb and higher memory memory bandwith

[Dani]

Nah, great BIOS, great mobo but Vcore fluctuate like mad, we need some Vcore mod and maybe Vcore sense mod

With REAL 2.3V-2.4Vcore we can reach the sky