Highest safe & benchmarking VDD (NF7-S rev 2)?

**xDUCK** · 10-04-2003 05:43 PM

Hey there,

With adequate cooling (Zalman NBJ321 + 21CFM fan for day to day, direct die chilled water cooling for benchmarking), what's the max VDD I can pump through this thing without drastically shortening it's lifespan? By that I mean, what's the VDD equivalent of 3.2v for RAM? (long term safety)

And for when I'm benchmarking with direct die chilled water... What's the highest VDD, and what's the max recommended time to run it?

Thanks in advance!
Mike

**STEvil** · 10-04-2003 06:33 PM

2.0v

Some run up to 2.2v, but you should cool the little vreg or whatever it is that has a tendacy to burn up when you get in that area...

**sexsymbol** · 10-04-2003 07:47 PM

Hi,
DonÂ´t go over 2.16v even if youÂ´r using a heat spreader on top of the little vreg chip, it burns. My epox 8rda+ vreg chip after 2 hours at 2.2V completely burned. My northbridge remained untouch (it was lapped and water cooled, guess that helped

). That little chip should be also watercooled

, its amazing how hot it gets. If I can get my self a digi can I would post the pics of how the chip ended after the 2.2V.

**xDUCK** · 10-04-2003 08:13 PM

Ok, so (to clarify)... 2v is 100% safe for 24/7, and 2.2v is safe for short term benchmarking (but won't hurt the motherboard's life span) as long as I put a little heatsink and/or fan on the vreg chip?

Btw, where is the vreg chip?

**xDUCK** · 10-04-2003 08:23 PM

Originally posted by MickeyMouse
2v+ wiht great chipset cooling.

Whoo, I've been running 1.99v (read through multimeter) with just that NBJ321, some ceramique, and a couple 80mm 21CFM fans (one blowing down, one sucking from the side).

Think I might be damaging my chipset?

**corrupt** · 10-04-2003 09:33 PM

Hehe I have 2.0v's going to the NB and only use a Vantec Iceburg cooler and its been running like that for like 3 months solid and no problems YET< knock on wood,lol.

**st0nedpenguin** · 10-05-2003 02:23 AM

Originally posted by xDUCK
Btw, where is the vreg chip?

I'm with xDUCK, does anyone have a shot of the vreg chip?

I had a sinking binge the other week and would like to make sure I got it.

**saaya** · 10-05-2003 04:07 AM

2.2 is 100% safe with a tec. i even know people who run 2.4v for months

**Holst** · 10-05-2003 04:53 AM

How is the VDD produced on the Nf7S?

Comparing it to the 8rda = is pointless as its not the NB that dies but the voltage regulation.

With good cooling I think the NB can survive 2.2 or more, the dangerous bit is the VDD regulation.

**texuspete00** · 10-05-2003 07:53 AM

I shove 1.93 in just for like 211 on my v1.2 with a compusa little celeron heatsink. Think I might get a v2.0 just don't want a 2.1 to come out and bite me in the ass like the 2.0 did.

Link to a pic of the vreg you guys are talking about? Boards seems seem to flake out after extended hours of high load.

**sexsymbol** · 10-05-2003 08:27 AM

Originally posted by saaya
2.2 is 100% safe with a tec. i even know people who run 2.4v for months

SAfe for the northbridge, but not for the little chip. My northbridge looks great and after resoldering a new chip the board works great. But that chip canÂ´t handle above 2.2v. I was using a Zalman NB32J heat spreader on top of it (of course cutted to the size that chip is pretty small) lapped (I meand lapped the piece of heat spreader) and epoxy with artic silver and with a good air flow provided by two 120 mm fans that are sucking air into my case, even with that the chip completely burned. Above 2.2v you should use a tec on top of that chip instead of over the northbridge

. For 24/7 use donÂ´t go over 2.1v and if you want higher fsb use a tec and epoxy heat spreaders in every single hot place of the board.

**Zeus** · 10-05-2003 09:43 AM

Originally posted by st0nedpenguin
I'm with xDUCK, does anyone have a shot of the vreg chip?

I had a sinking binge the other week and would like to make sure I got it.

I'd also like to know where to find that vreg chip.

A pic please....

**sexsymbol** · 10-05-2003 09:53 AM

http://www.motherboardfaqs.com
Is the little chip where you have to solder to do the vdd mod.

**Holst** · 10-05-2003 10:01 AM

You cant see the model of the chip in any of the pics.

I dont like it when people write up a Vmod and dont give any technical details. Instructions of where to solder is all very well but I think people should understand what they are doing when moding like this as it reduces the chances of a mistake </rant>

It looks like an IR3075 but id like to know for sure.

**sexsymbol** · 10-05-2003 10:15 AM

This for 8rda+ but might help you.

http://www.vr-zone.com/guides/EPoX/8RDA+/

**Holst** · 10-05-2003 10:16 AM

I know all about the 8rda+, I wanted to know about NF7S

**uwackme** · 10-05-2003 10:17 AM

if you have a board.. go look.

Yes it is an InternationalRectifier MOSFET...a dual mosfet transistor in a package chip. It is the output stage of the VDDR voltage regulator circuit...READ "POWER SUPPLY" and therefore gets damn hot.

It isnt Abit etc's fault, they and the others just use NVidia's reference design. The "enthusiast's" board makers should all be altering the reference design to include BEEFIER mosfet circuits and slapping small heat sinks on them all. This is EXACTLY the same circuit setup that is UNDER the "plate" on the backside of ATI9700pro's.. and we all know how hot that gets.

I'll have to wrack my brain figuring out how to add a nice heatsink to this one. The reference design relies on it being soldered to the PCboard to be "heatsinky" enough. It might help if some artice ceramic was dropped under the chip for better chip/pcboard heat conduction.

It always blows my mind in a world of close products... you use these kinds of little tweaks to DIFFERENTIATE your product from the pack.... and people flock to the added quality and feature set of your product. Instead Taiwan is full of lemmings who couldn't think out of the box to save thier own lives.

**Holst** · 10-05-2003 10:26 AM

i dont have a Nf7s board I was hoping they were not using a 3075 as thats a limitation to what VDD you can run.

Im very tempted to try and make an uber NF7S, I have allot of new ideas that could do with testing out, unfortunatley I done have any memory that will run high FSB and buying new ram and board will be expensive.

**Holst** · 10-05-2003 10:27 AM

I dont suppose somebody can post a high res pic of all the chips under the AGP slot, so I can get some idea of how the VDD is regulated?

**Zeus** · 10-05-2003 01:13 PM

Originally posted by Holst
I dont suppose somebody can post a high res pic of all the chips under the AGP slot, so I can get some idea of how the VDD is regulated?

How's this for a picture?

**G H Z** · 10-05-2003 06:52 PM

Zuess, is that the VDD mod for an NF7-S rev2? 2nd pin from left on that chip to ground? What ohm vr used?

Thanks Bro! Nice Pic!

G H Z

**jonspd** · 10-05-2003 07:05 PM

http://www.motherboardfaqs.com

**Zeus** · 10-06-2003 08:36 AM

Originally posted by G H Z
Zuess, is that the VDD mod for an NF7-S rev2? 2nd pin from left on that chip to ground? What ohm vr used?

Thanks Bro! Nice Pic!

G H Z

Correct mate, that indeed is a Vdd mod for the NF7, the value of the pot is 10K.

**uwackme** · 10-06-2003 09:47 AM

Time to look into increasing capacity by piggy backing a second mosfet chip on top of the first. This would lower gate resistence, but would increase overall current handling. Hmmm, I need to hit the books on this one.

**Holst** · 10-06-2003 09:54 AM

I als thought about doing that uwackme, but I wasnt sure how too and didnt have time to experiment.

I think the easyest way would be to pull the CPU voltage regulation from a dead board and set it too 2.2 or so volts. Thats pretty easy to do (if a little bulky)

The A7N8X uses totaly different VDD regulation to epox/abit and I think its a bit more durable.

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