*NEW* 5V via Vdimm mod [Abit NF7]

[owies]

"5V" Vdimm mod

Ours mod depend on cut off 3.3V from Vdimm section and add 5V rail.
First what you need to know is division on the upper and lower mosfetVtt and Vdimm
Voltage measure points are in traditional places, so I think no need to explain.
Ok, lets do it!

rev 1.0:

First you must remove shottky diode marked on picture.
Next unsolder 1st pin of lower Vdimm , and 5th and 6th pin upper Vtt mosfet from PCB and make 100% sure that it is not connected to anything!
Now take a wire and solder it to this pins (1,5,6) and connect to 5V rail.
That’s all you have finished the mod.
If you want have regulation of Vdimm up to 5V you should to do classic Vdimm mod and any of Vtt mod you choose.

What VR to use?
Hmm, somebody should test it, choose optimal and post it

rev. 2.0:

Basicly most is the same, a little bit less work and more safe

Difference:
The shottky diode must return, but in other position (shown on picture) to second leg of diode connect wire with 5V rail. (main power source for Vdimm section)
Unsoldering 5th and 6th pin of upper Vtt is no needed. (in consequence Vtt isn`t that hot like in rev 1.0)

Both metod was tested and works fine, but we sugest to do rev 2.0 becase it`s more safely and powerfull

We didn`t take responsible for fryed or damaged stuff, result of mistakes. This is oc

Enjoy

BTW:

Of coz, you must have good cooling of mosfets, specially uppers!

Vtt mod is no nedded, but only if you do some kind of booster, Świders trick Its depend on link output upper Vdimm mosfet (Vdimm measure point) and that pin of DDR slots where was connected 3.3V rail in 3in1 mod. Then Vtt is always half of Vdimm Don`t do that!!! That will kill your mobo
If you broke 1st pin of lower Vdimm mod is still working, but Świders booster won`t work.

Sorry for bad quality pictures (made by Świder) and late with this mod, we have no much free time.

Special Thanks to:
RaVeN155 for dead mobo to tests
persivore for parallel, independent work on the mod
Świder for drive on me

[Swider]

OK
OWIES didn't tell you about him twinmoses :P Before this mod he could get superPI 16MB 250MHz FSB @ 3.8V vdimm, after 255MHz @ 3.4V It's look hot

Sorry for pics... :/ I will do better one

And... Świder&OWIES ModLAb

[owies]

OWIES didn't tell you about him twinmoses...And... Świder&OWIES ModLAb

Yeah forget,
Don`t tell me we are to late... anybody has still NF7? anybody wan`t do mod? It safe, tested 24/7

Btw. or OWIES&Świder

[persivore]

I posted the mod for the NF7 V2 a while ago here, but did not follow anything up becasue I somehow killed the Vdimm supply on the board (I don't know if it was due to the mod or if something else happened. The Vdimm MOSFET was being supplied by the 3.3v line when the board died).
I repaired the board using a new Vdimm/Vtt circuit I designed, and the board works again now (with properly following Vtt).

[owies]

Ours mod is safe at all, we think up it, not copy. You have not complet cut 3.3V becase the lower Vdimm have still 3.3 rail on leg 1st, maybe that was the problem of Fry your board

[tictac]

awesome mod..

congarts

[enduracell]

yeah one of the coolest mod ever too bad I don't have this mobo anymore

[owies]

Thanx
Unfortunately we have late with this, moast pepole have now A64 here, but in Poland NF7 is still popular but ours pepole are litle afraid to this mod.

[Swider]

Thx

Only way is that users can send they mobos to us for modding

We can't say DFI is the best ;] ABIT RULEZZ so we do all we can to get highter stable FSB Without this mod we can get... http://members.lycos.co.uk/swidrzany/FSB258/ and now it's time to try my BH6 with this 5V mod

[persivore]

Owies, would it be possible for me to be credited in this thread somewhere as I origionally posted the mod for the NF7 V2 when you were still developing/testing it.

lift the anode leg on a diode near the the Vdimm MOSFET, and connected this to the +5v on a molex connector via another diode to drop the voltage slightly to try to protect the Vdimm MOSFET.
The diode that I soldered to is the one that is close to the Vdimm MOSFET and the winbond Vdimm regulator, behind the AGP connector. The anode of the diode is the leg closest to the AGP connector (furthest away from the DIMM connectors).

Also, I have found out why my NF7 died after doing the mod. After testing that the 5v mod worked, I put the diode back into its origional possition, and removed the Vdimm mod and variable resistor, and in the process I somehow cut the trace between the feedback resistor and the feedback pin on the winbond power controller.

[tictac]

yeah to late for me

i dopnt have this board anymore

anyway Congrats again

NF7 will always be remember

[chefnr1]

you'r not planning to do a try on a AN7 board??

[jumanji969]

If I get my DFI board back I might just try this mod, but thats only if the board comes back.

[owies]

you'r not planning to do a try on a AN7 board??

I haven`t got that mobo, if i will have some free time I could try it theoretically. Need hi rezo picture of Vdimm section, but imho i didn`t see no reason to do it on AN7
@jumanji969
What DFI board (model)?

[chefnr1]

I haven`t got that mobo, if i will have some free time I could try it theoretically. Need hi rezo picture of Vdimm section, but imho i didn`t see no reason to do it on AN7
@jumanji969
What DFI board (model)?

reason is that i whant to rise vdimm with upp to 3.5-3.6v and as org it's only 3.25v and my mem sticks work best at that volt

[owies]

It will be easier if we have to AN7 mobo

[Kamerat]

Did something like this with my Gigabyte K8NS back in July, sorry for the blurrieness. The K8NS uses two diodes in parallel.

On my older Gigabyte K8N I just cut the 3,3V wires and used 5V insted of 3,3V. Don't try this kids, worked for me but don't know about you.

Edit: Another photo of the diode-mod from a different angel.

[funktional]

Nice mod

Just did it on my old half broken NF7 and it works great. Unfortunately I fried my good old noname 128MB PC2100 Chip at ~4.3V

Im going do do the mod on my brandnew NF7 now.

[funktional]

It works but the Board wont boot if I go higher than ~3.3V. I can raise Vdimm above 3.3V if the board is already running.
I did the second mod. Any ideas whats wrong here?

[Paxi]

i havent much experience with mods but 5V Vdimm Mod that really seems to be awesome
great work

[owies]

It works but the Board wont boot if I go higher than ~3.3V. I can raise Vdimm above 3.3V if the board is already running.
I did the second mod. Any ideas whats wrong here?

I also had that problejm copule days ago, but my mobo is realy tired.
I try it on new one.

Thx again

[funktional]

What does the bios show you as '3.3V dual voltage' when you have the 5V line attached? Mine shows 2.88V. With 3.3V railattached its 3.4V.

Unfortunately the Board wont even start any more when I use the 5V rail. Fans start and then the mobo turns off again. I have to switch off the PSU to make it work. No problems with the 3.3V line. This might have to do with my PSU as its a bit sensitive but the issue that i cant go above 3.2V when the 5V line is attached has to do with the board itself.
Its layout Rev 0.53.

[chefnr1]

i moved two caps beside of dim1 so that i could put my ocz booster in it and i running with 3,50v vdimm now in dual before it just have to be in dimm3 and only goes singel, thaths cool i can do 255x11 now stabil

[owies]

What does the bios show you as '3.3V dual voltage' when you have the 5V line attached? Mine shows 2.88V. With 3.3V railattached its 3.4V.

Unfortunately the Board wont even start any more when I use the 5V rail. Fans start and then the mobo turns off again. I have to switch off the PSU to make it work. No problems with the 3.3V line. This might have to do with my PSU as its a bit sensitive but the issue that i cant go above 3.2V when the 5V line is attached has to do with the board itself.
Its layout Rev 0.53.

1st 3.3dual voltage - i have no idea what is it, Świder says its something in Vcore, no take over this.

2nd did you unsolder 1st pin of lower vdimm mosfet? I had that problem with soldered this leg to board.

3rd When we test this mod we have fray świders psu because the 3.3 was not cut at all while we give there 5Vrail. Psu was fighting between two shorted rails and dead.
Be sure its cut at all

[funktional]

I didnt unsolder the lower vdimm pin but I cut the trace and checked if it was still connected anywhere. I have some bad experience with lifting pins as they tend to brake when I lift them . But I will try that.

Thx for your help