Abit NF7-S 2.0 Vdimm modding

[Method Man]

Any of you done this mod yet??? I was going to attempt it but the resistor is so tiny...
http://www.motherboardfaqs.com/NF7/images/vdimm_mod/solder_points.jpg

looks like if I'm going to do this mod I need a magnifying glass:eek:

[k1114]

I've heard from 3 people who have used my guide no problem, one of which is a regular poster @ my board. I beleive he end up with ~800ohms for 3.2ish. It's been a while but I can check my email logs if you want some info from someone who has done it. It's actually not that small of a component, it's just rather delicate (although you will still be ok if you remove it, just gotta do the alternate method then)




By chance is your email address methodman@hotmail.com? got some not so positive email from that account but the guy wasn't bright enough to give any reason... still wondering who he was and why he was pissed off. Don't know of anyone else who uses that name, although i'm guessing its one of those things i'll just never know.

[Method Man]

Hey k1114 that would be great if you could find out how they did it...If you look at the resistor its very small looks like I would need some small gauge wire and a magnifying glass to do it.

Also great website man thats where I got the info for my 8rda+ VDD mod, and the Abit mods :toast:



Sorry to hear you got a nasty email...It wasn't me though I don't use hotmail (to much junkmail)

[k1114]

The vdimm mod works just like the guide on the site, one of the guys who I talked back and forth with just soldered right to that surface mount resistor like in the pic. Also, if you accidentally break off the resistor you can use this image: http://www.motherboardfaqs.com/NF7/images/vdimm_mod/alt_method.jpg but be warned that the resistor value in this pic is NOT correct. It should be 10 ohm and 1k ohm, not 10 ohm and 100 ohm.

You might try posting in my small forum here http://forums.motherboardfaqs.com/ (registration not required, so it won't be a pain) because a couple of people who have used the guide post there regularly (especially "Ray", he's done every mod I've posted for both boards) and can probably give you a better advice then I can ;)

I've never done this mod so I don't know much more then what is on the guide. For the abit guides, I just write them then find "guinea pigs" to beta test them before I publish them on the site. I'm too happy with my board right now to risk killing it with a botched mod :( BTW Most of the credit for many of my guides belongs to members here:)

[MrAngry]

I think I am in need of this mod since I'm using Geil memory and it's rated at 3.1v I beleive. I can't seem to get over 218 at the moment and I have it running in DC with two 256mb sticks of pc3500 platinum ultra. I have also considered trying the vdd voltage a little higher than the 1.83-1.84v I have it at now, but how much more is safe?

[Method Man]

I have run mine to 2.3V with no problems....if you stepover that line it will have problems.

[MrAngry]

So upping it to around 2v should be safe then, I wasn't sure how fragile the chipset is or isn't 2v on a circuit isn't much.:D What kind of problems did you have when you went above 2.3v?

[Method Man]

Ya, I've been just fine running @ 2V for a cupple days now.


When I wen't past 2.3V the whole system turned off(that can't be good):p

[berkut]

Done those mods- the Vdd is very nice, just dont overdo with your fsb and voltage (ran @ 2.45V and the bios corrupted)

The Vdimm works also great, no problems...

[AKRedneck]

I connected a 1k pot from the pin side of the resistor to ground for the vdimm mod. After connecting it, the voltage went up approxiametly 0.1V. As I turn down the resistance the Vdimm doesn't really move much. I've got the resistance around 350 ohms at the moment and the Vdimm is only at 3.17v. What I'm really looking for is above 3.2V. What resistance are you people using? It just seems like I've turned the resistance down quite a bit and nothing much is happening.... Is this the norm? Does the Vdimm start to rise fast when I get to a certain point? say around 200 ohms?

:confused:

[AKRedneck]

Ok, solved the problemo.. In case anyone else has the same prob, I noticed my 3.3v line was a little low.... (3.23v).. After crankin the 3.3v up to 3.31 in bios, the Vmem went up from 3.17 up to 3.24v.. Problem solved (at least that's what I think!)..

:D

[AKRedneck]

Did anyone ever figure out how to measure the actual voltage on a stickle of memory....or do we think the bios is pretty friggin acurate? I remember someone asking this very same question..

[SmokeyTheBandit]

I wil put this mod up the board in a few days :)
Lets see if 7k1 is doalbe for an AMD + 9700 NP :D

Ill make some picz 4 ya :)

[celemine1Gig]

This would be very nice! Some pics would sure help, as I assume a lot of us are thinking about doing the VDimm Mod (if they haven't already done it).
250 MHz FSB in sync mode would be really cool. Perhaps some V-Data RAM with a VDimm of 3.0V+ can take it. Or better, I hope it can, as I'll get some, soon, and my Abit NF7 and NF7-S boards (both Rev2.0) are already waiting for some high FSB action.:)
Unfortunately I'm still at 200 MHz FSB, as I'm still waiting for the parts for my secondary sys. I won't risk to overdo it without a backup sys.

[k1114]

I second the request for pics of this, could definately them one for the mod guide! All I have are the diagrams I drew onto pictures of the stock board.

[xigfrid]

Originally posted by AKRedneck
Ok, solved the problemo.. In case anyone else has the same prob, I noticed my 3.3v line was a little low.... (3.23v).. After crankin the 3.3v up to 3.31 in bios, the Vmem went up from 3.17 up to 3.24v.. Problem solved (at least that's what I think!)..

:D

hi , was looking the way to adjust the 3.3V line , but can't find out whow to do it :p
I suppose that you have one of these smart PSU that can adjust this with a pot.

I got an ANTEC 430W PSU truepower, and so far, I haven't an idea if it has pot. or not (don't think so : only old ones have pot.)

can you confirm AKRedneck ?

Thx in advanced

Xigfrid

[AKRedneck]

I don't think the truepower have pots... I think that's why I never bought one.. ;)

[Jens]

i encounter a strange problem when vdimm modding my rev1.2

i just took a 820 ohm resistor to start with, as i didn't have a 1k pot at home.

soldered it like shown in the picture...

but now the funny thing

instead of an increasing vdimm, the vdimm dropped by ~0,2V, resulting in 2,46V when set to 2,6V

had some problems to get into bios before the machine locked up :D atm i've set it to 2,8V which gives me 2,65V.

any suggestions?

/edit

tried a 450 ohms resistor.. guess what ... voltage stayed exactly the same

then i cut the whole thing off... no change whatsoever

i definitely must've messed somethin up now this sucks :stick:

[Trakfast11]

how many watts was the soldering iron you used rated?

[Spec3]

I did the vdimm mod...no soldering just some crazy glue.

http://members.rogers.com/overclockedguy/vdimm1.jpg

http://members.rogers.com/overclockedguy/vdimm2.jpg


Works :toast:
http://members.rogers.com/overclockedguy/vdimm4.jpg

Steve

[xigfrid]

well it overvolt well , but Steve do you have better stability ? if yes , which psu are you using ?

I did the Vdimm mod about 3 times now, all 3 gave me great overvolt like 3.3V but no stability increase !!!

Btw , i'm running my OCZ PC3500 @ 233Mhz, 3.02V without mod., but with mod. set at 3.2V , my ram won't even do 220Mhz stable :/

That's on REV 2.0.

[Spec3]

Originally posted by xigfrid
well it overvolt well , but Steve do you have better stability ? if yes , which psu are you using ?

I did the Vdimm mod about 3 times now, all 3 gave me great overvolt like 3.3V but no stability increase !!!

Btw , i'm running my OCZ PC3500 @ 233Mhz, 3.02V without mod., but with mod. set at 3.2V , my ram won't even do 220Mhz stable :/

That's on REV 2.0.

When I had my ram at stock voltage it would do no more than 230Mhz stable. With the Vdimm mod my OCZ pc3500EL now does 250Mhz

You either need to do the vdd mod of condition your ram more.

Steve

[xigfrid]

Thx for reply, at least your Vdimm mod worked. I 'm stock with the 234 Mhz now (vdd is present ;))

which psu do you use ? and how is you 3.3V rail ? mine is 3.23V, and with this §§§§ty Antec PSU, i won't be able to overvolt it


Another questions (i know 4 in 1 thread is a lot) :
When did you regulate the vdd ?
I regulated it when i was at 210Mhz and 2.6V on ram, it should have decrease a bit, but i ve no more voltmeter to check it. [checked : I can't increase the Vdd without freezing my system]

Is your cpu interface enabled ? (when i disable it , i can boot at higher FSB but it bench so bad in sisoft)

BTW , really nice overclock, would be glad if 1 day my NF7 do the same :toast:

[Spec3]

I have an antec 400W psu that I have tweaked. My 3.3V line as seen in that pic usually runs 3.3-3.4V.

I had to up my vdd when I reached 230Mhz.

I have cpu interface on right now but AFAIK it never made a diff to my fsb overclocking

Steve

[cowpuppy]

I am going to be doing the vdd mod this weekend and am hoping for the best. I have already hit 250 and looking for some more :cool: and the stability to go along with it