GA K8NSNXP-939 Vmods

[xgman]

Anyone can post the how to and pics for the vcore and vdim mods. So far I only have this fic of the vcore mod location but no specifics.

[bh2k]

If it's an ISL6559 then it's a 20k vr to ground

[xgman]

I think it is a winbond chip pin or sodder point to 1K to ground but I'm not sure or which pin/point.

[xgman]

Here is a general not close up pic if it helps point it out.

[pkrew]

Hey xgman, I just had an idea. Sign up for macci's site and ask him. I bet he could tell you how to do the mod. He discovered that mod on the K8NNXP.

[Hell-Fire]

Pics of the board are a must until you find a guide online.

Need pics of the area around the dimm slots as well.

What are the markings on these chips?

[Hell-Fire]

Chips circled in red.

[pkrew]

I'm also suspecting that both vcore reg chips need to be modified. If each chip controls 3 phases of the 6 phase power then modding only one chip would give you 3 phases lower. What I really need is some schematic or info on how giga is implimenting their dps on this board

BTW, Einstein not only failed math he could not tie his own shoes, and wrote his theory of relativity while working as a patent clerk

[xtremetheme]

"Yes, its true..he did, not a joke so stop PMing me about it. "

lol :p:

6 Phase power needs 2 reg chips? Thats interesting, have to remember if i ever get a 6 phase one.
But there are no 4 Phase power boards which have e.g. 2 reg chips or ?

[pkrew]

It may not need the two chips, but that may be how they set it up. The dps is designed so that if 3 of the 6 phases fail, then the other 3 will still function. redundant systems. If each is controlled by its own reg chip then its possible that one of the 2 3 phase subsystems is proviing say 1.7v while the other modded subsystem is giving what you modded it for. Wouldn't know for sure unless you had a schematic or talked to one of their engineers.

[xgman]

If it's set up to provide if one fails, then I would think that they both provide full power, but only one at a time. That means there would only be reason to do one chip, but how do you know which is the primary one? Isn't the board on Macci's site a 6 dual board too?

I'll post some detail pics tomorrow and compare the chips to the K8N pro and K8NNXP chip mods.

[pkrew]

actually I think that they provide power at the same time. They would just be out of phase with each other. Yes the one on macci's site has dps, but only one reg chip. The K8NSNXP-754 has the same dps as the K8NNXP, with only one reg chip. On both of these the dps is an add on card to the mb. The add on card may have its own vcore reg chip.

The K8NSNXP-939 has a different dps, now called dps gold. It appears to be hardwired on the mb, but haven't tried to remove it. It would be nice to be able to disable it and see what happens.

Of course I could be just completely full of it also:D

[Hell-Fire]

Several boards have more than one "Vcore" Vreg onboard.

Typically, there are 2 or 3 that have a part in the regulation, with a main IC controlling those.

It is interesting that there are 2 full blown regulators tho.

[pkrew]

Originally posted by Hell-Fire
Several boards have more than one "Vcore" Vreg onboard.

Typically, there are 2 or 3 that have a part in the regulation, with a main IC controlling those.

It is interesting that there are 2 full blown regulators tho.

What type of risk would there be to modding both?

[Hell-Fire]

None.

However, I am not familiar at all with this board.

Are you saying its a 6 Phase Powered board?

[pkrew]

Yes its a 6 phase power board. It has what giga calls dual power system gold. Each power system is 3 phases and fuction at the same time. If one fails however then one continues to function, but will be only 3 phases. Thats according to the manual

[Hell-Fire]

Very interesting.

I have got to start spending some time studying some of the newer boards coming out so I am familiar with them.

If this is the case, then you would need to mod both of them I am guessing. Obviously finding the points to check voltage before modding so we know what Vreg circuit path is.

[pkrew]

Originally posted by Hell-Fire
Very interesting.

I have got to start spending some time studying some of the newer boards coming out so I am familiar with them.

If this is the case, then you would need to mod both of them I am guessing. Obviously finding the points to check voltage before modding so we know what Vreg circuit path is.


Sounds good. The people who have been modding the giga A64 boards have just been using monitoring programs to adjust vcore. I'll have to look, but can get some pics of the board with the dsp cover off if needed. I'll also look through all the threads on modding these boards and see if anyone has traced things out.

I did mod one of the chips and it increased vcore according to mbm. I'm thinking, however, that monitoring circuit maybe just monitoring one side. I also seem to be getting a fair amount of fluctuation.

What I'm thinking about doing is setting the voltage with the first mod using mbm, then powering down and unhooking that mod and measuring resistance of the vr. Then use that resistance to set up the vr for the other mod.

[Hell-Fire]

Originally posted by pkrew
Sounds good. The people who have been modding the giga A64 boards have just been using monitoring programs to adjust vcore. I'll have to look, but can get some pics of the board with the dsp cover off if needed. I'll also look through all the threads on modding these boards and see if anyone has traced things out.

I did mod one of the chips and it increased vcore according to mbm. I'm thinking, however, that monitoring circuit maybe just monitoring one side. I also seem to be getting a fair amount of fluctuation.

What I'm thinking about doing is setting the voltage with the first mod using mbm, then powering down and unhooking that mod and measuring resistance of the vr. Then use that resistance to set up the vr for the other mod.


That sounds like a good plan, but I would first take a resistance reading between pin #10 and GND for each of those ISL6559's just to make certain we have have the same base resistance. If not, then transferring one VR value to the other IC may cause problems....especially if the resistance of the other IC is much higher than the IC you modded.

[pkrew]

I'll do that, so its pin #7 eventhough the mod is pin #10?

[Hell-Fire]

That is my mistake pkrew.

It is pin #10.

Be sure to take a resistance before soldering any VR there. If you arent sure what VR to start with, give me the base resistance on pin #10 and GND.

I will check this out after dinner.

[pkrew]

I have a 50k ohm one one the ISL6559 next to the socket. I measured it before with the bios setting of 1.7v, 2v on mbm. It read 5.6k ohm's. I'll have to take down the system to remove the mod for a base reading on both pin #10s. Its partially under my gasket unfortunately. I'll do that sometime tomorrow and let you know what each one reads. Hopefully, they'll both be the same. Thanks for all of your help. I'll let you know what I get

[Hell-Fire]

Are you are saying that before the mod, the resistance on #10 to GND was 5.6K, or after getting 2v it was 5.6k with the mod in place?

[pkrew]

No, I'm saying that I removed a wire from the 50k vr that I used to do the mod and measured the vr. It was set at 5.6k, which gave me 2v in mbm, with a bios setting of 1.7v. So a .3v increase

Edit: actually, come to think of it. I could remove the remove the wire that goes to pin #10 and then measure the wire to ground. That should give me the resistance of pin #10 for that chip and then measure the other chip. I wouldn't have to take down the system then.

[pkrew]

Ok, I took down the vcore mod and measure both ISL6559 #10. The one next to the socket is 11.02k. The one at the edge of the board is 11.1K. That would seem to be within the tolerance of the components and be considered equal. I have the ISL6559 next to the socket modded with a 50k vr. I'll wait for you to tell me what you think

[xgman]

Interesting plan. Do you think there is much difference on this board with an FX53 on good water cooling between the highest stock bios voltage and 1.9v in terms of the top cpu end? At 1.8x on the via pro boards I was averaging 2,660-2,688 mhz before loosing some stability.

[pkrew]

Let me get this tried first. At it is atm on the Asus at 1.82 I could max run spi at 2.95. With only modding one of the reg chips I can max run spi at 2.93 at same voltage on the giga

[xgman]

OK guys, I need some help locating the mods. Mostly Vddr sodder point on the front. I know which pin on the winbond chip, but the sodder point of the K8NNXP and KN8 pro boards look totally different from the 9393 one. here are the 2 pics vddr and vcore :

I think that lower last large mofset is the read point.

[xgman]

and vcore chips:

[pkrew]

I'm not sure about the vdimm mod, but the read point for vdimm is the top leg of the lower mosfet. So far I've modded the bottom chip with a 50k resistor. Its pin #10 to ground

[xgman]

How did you decide on the bottom one? lol

I saw a pic with the read on the bottom leg of the bottom mofset reading the vddr??

The 2 vdim points, I am told should read zero ohms, but the 2nd leg of the winbond chip to any of the points reads way more. I guess I'll have to try to sodder to the leg, but it is so close and tiny.

[pkrew]

Its the same read point as the K8Npro and I've measured it on my board

[pkrew]

Sorry, you meant the vcore, Its the one that misterodster used for his board.

[xgman]

Originally posted by pkrew
Its the same read point as the K8Npro and I've measured it on my board

So the VDDR read point pin is where I have the yellow blob?

[pkrew]

Yes, that is correct and just verified on my board.

[xgman]

Thanks. I wish I knew what I was looking for on top of the board for the sodder pad. The surrounding points are totally different than the other boards. I'd do the bottom mod, but I don't want more than 3v or so and my rail is 3.5 as it is.

[Hell-Fire]

Originally posted by xgman
So the VDDR read point pin is where I have the yellow blob?


You PMd me saying that 2nd pin from left on top row of pins of the WinBond chip is regulating Vddr.

If so, then do a connectivity test between that pin and the surrounding resistor to find out what resistor the path is going through.

Better yet, with a magnifying glass, you may be able to see a trace going from that pin and into the resistor.

If so, take a resistance of that resistor and we can go from there.

[pkrew]

Did you see that I measured both pin #10 and got 11.02K for one and 11.1k for the other

[Hell-Fire]

Originally posted by pkrew
Did you see that I measured both pin #10 and got 11.02K for one and 11.1k for the other

Does the bios show a reading for Vcore??

Unless you know which Choke/FET to measure from, we need something to let is know which (maybe both) ICs must be modded.

[pkrew]

The bios doesn't show anything about vcore except pass or fail. I can read it off of cpu-z and mbm. I could also load giga oc utility which should have it. Right now, with the lower IC modded, cpu-z is reading between 1.808-1.856v.

[Hell-Fire]

It reads that with what setting in the bios??

[pkrew]

The setting in the bios is 1.7v

[pkrew]

Here's a pic with the dps cover off. The red rectangles aren't mine

[Hell-Fire]

Thats a big flux from 1.8 to 1.85v. Maybe both do need to be modded.

Do me fav, the ICs in red, and the smaller 8 legged ICs...what are their markings?

[pkrew]

I thought so too. My board is running atm. Let me ask the person who took the pic

Occationally, it bounces to 1.872v

[pkrew]

Sorry, haven't heard from him yet, hopefully tomorrow. One thing that I did notice is that all the other giga boards for A64 only have one vreg IC and that everything is duplicated in this board. Here's a pic of the K8NNXP. I would be willing to bet that the add on card for the other 3 phase has a vcore reg chip

[pkrew]

He sent close up pics instead. The IC in the red rectangle is on the upper right.

[pkrew]

Here's a pic of the small ICs

[pkrew]

Well, tried to mod both IC's with 2 50k vr's set at 5.7K. It ran for a short period, the vcore seemed more stable and then it shut down on me. It wouldn't restart untill I removed the second mod. My guess is that it triggered the overvolt protection circuit. You must need a different setting on the vr for the other IC.

[xgman]

I gave up on this board. I don't think the pci divider is working at all.

[Hell-Fire]

Gave up as in what?

If you arent using it, would you consider sending it to me for a week of testing??

Still interested in working the mods out on this for other members that may have it, or buy it later.

If you decide to send it to me, I will do the work for free as long as you pay return shipping.

[pkrew]

The dividers work perfectly on to board. I did try to mod the second IC with a vr set at the same resistance and it triggered the overvolt protection. So I removed it. I did notice that after I switched the onboard raid the vcore stablized abit.

However, if xgman isn't interested I may be willing to send you mine. I could also send an A8V. Maybe get a better vdimm mod for it.

[Hell-Fire]

I would be happy to look that stuff over pkrew. ;)

[pkrew]

Sounds great. Why don't you pm me your add and I'll get them ready to go. I can run on my P4 for a while. It'd be worth it to get the mods for these boards set in stone. I'll send them probably monday 2nd air. Let me know if you need anything other than the boards.

[EmineM]

any confirmation for vdimm mod yet?

[pkrew]

If you don't mind high vdimm there's a 3.3v rail to cap mod that will give whatever your 3.3v rail is set to. It works well

[EmineM]

yea seen it before, another question tho, does vtt go up when adjusting vdimm or do you need an extra vtt mod?

[pkrew]

no you don't need to do an extra vbt mod, it tracks just fine

[Hell-Fire]

if you see this pkrew...yout PM box is full buddy. ;)

[pkrew]

Sorry, bud, I'll fix that for ya.

Fixed :D

[pkrew]

Here's some pics Hell-Fire

[pkrew]

1kOhm VR for both mods to ground. I tried to find a pic of the reading point for vbt, but couldn't find yet,will keep trying. Its suppose to be a fet on the other side of the dimm slots. From macci's thread he said shorting the diodes removed the .4v lag

[pkrew]

Here's another one from bowman1964

[pkrew]

A pic of the ATX to cap mod on the K8Npro. The K8NSNXP-939 has two caps in that location

[pkrew]

A pic of the front of the board with the correct cap circled

[Hell-Fire]

Originally posted by pkrew
1kOhm VR for both mods to ground. I tried to find a pic of the reading point for vbt, but couldn't find yet,will keep trying. Its suppose to be a fet on the other side of the dimm slots. From macci's thread he said shorting the diodes removed the .4v lag

That would sense as any component in parallel with a diode can only receive the same voltage as the diode allows across its terminals.

Shorting them pretty muchs allows the voltage to flow "around" them.

I cant truly tell, but using post #13 above, it looks like the resistor that the wire is connected to is connected to pin #19 on the Vreg??

[pkrew]

I'm not really sure about the pin. I'll keep looking, but the pic in #11 shows the connection directly to the vreg chip. Should be able to count the pins.

[Hell-Fire]

Yeh, looks like pin #19 alright.

[pkrew]

That's what I would say. Sorry I didn't get to those other pics. Got a little busy today. It should be the same as the K8Npro. If you need anything else let me know.

[longshot]

so did we figure out the vcore and vdimm mods for this board?

[JNav89GT]

yeah I need to know
have board coming and will cap mod it but I need vcore :p

[Symphysodon]

Yes, a working result for Vcore and Vdimm would be really nice :(

[Hell-Fire]

Sorry guys.

Been busy with other components. Give me a day or 2 and I will post the Vdimm mod results. I can only wager a guess on the Vcore as I dont have a cpu to test with.

[JNav89GT]

well I'm going to do cap mod I believe so that's set :)

Just a working vcore mod would be nice as 1.7 is weak :eek:

[Minnyboy]

Hell-Fire,

It's been a while since you said you were gonna try & get the mods done (well, find a way to do the mod)...

Just wanna see if you've found a way to do the mod.

I posted another thread asking for the mod for the s754 version. If they're the same board, could you delete my other thread??

My board looks very similar to the K8NNXP/K8NSNXP-939.

I've read this thread but am having trouble understanding all that's been said. It's a bit confusing atm.

Any help is appreciated.

Cheers,
Minnyboy

BTW, my 3200+ NewCastle $ucks Bigtime....

Either that or I'm not used to the AMD world... So far, only 2.45Ghz (thereabouts) from 2.2Ghz default with G/byte Ultra Cooler....

2800+ time... Hope it can do better with 2.8vddr... Til I get this Vmod done...

[JNav89GT]

well several factors to consider. What bios, timings, ram etc... will play factor

Try putting LDT to 4x, ram to 333 setting just for now.

[Minnyboy]

Everything is set to default & I've even set the ram to 2T & it still ain't stable...

BTW, the 3200+ CG 512kb CPU runs 2.2Ghz right??

Gonna put in a sing;e 512MB BH5 instead of my 2 x 256MB OCZ 3700 Gold to see if it makes a difference...

LDT is 4x, I've set ram at 333/400 & still no good.

I get BSOD's saying my X800 is playing up.

Never had this problem with my 2.8/Max3 combo

WTF??

Cheers,
Minnyboy

[Minnyboy]

Hell-Fire,

Here's a few close-up pics of the S754 K8NSNXP mobo.

Hope it helps in finding out if the mods for the S754 & S939 mods are the same.

Gonna have to post a few posts as I'm no good at joing pics.

Here we go:

[Minnyboy]

Another one:

[Minnyboy]

Last one:

Gotta find an image hoster so I can post links to the 939 & 754 boards to see if there's any major differences apart from the DPS thingy.

Cheers,
Minnyboy

[Minnyboy]

Just updating that the 3.3v rail to Vdimm mod works.

Only problem I have is that my PSU's 3.3v line is at 3.5v (can't get any lower with this damn Enermax 460w PSU.

Default for the 3.3v rail was 3.4 iirc...

Worked for a bit but now it farks my rig up badly.

During Post, I get artifacts galore & then rig freezes.

Took the mod off but can't be bothered rebuilding rig 2nite to see if it still works or if I have some more dead hardware to my collection.

I'm 99% sure it still works, at least it gets to the bootup (post) & then freezes/atrifacts.

Need help in doing the "proper" Vdimm mod...

Cheers,
Minnyboy

[Hell-Fire]

Ok, got the "proper" Vdimm Mod working and now working on the Vdd for this board.

I also have to test out to see if Vtt is tracking.

Will prob make a seperate thread if I get the Vdd worked out, among other possible mods just to get them all in on one thread.

I will post a link here once finished up.

[kyosen]

Hello All,

Please look here... the picture shows my Vddr/Vbt(Vtt) mods.

http://219.113.251.125/c-board/file/K8NSXP-939_Vddr-Vbt_mod.jpg

Now I've already sold off this board, so I can't mentition
further details;)

[Hell-Fire]

Yep, thats exactly how I did those mods as well Kyosen.

I also did the Vdd mod, although I dont know if its needed or not.

[Tom Holck]

What is the max CPU volt for this bord.

I need 2,1 volt + for my FX939;)

[JNav89GT]

max is about 2.0v. Any more really and people start blowing mosfets. Ask Opp lol. Anyway, I never ever got this board to clock for crap. I'd look elsewhere if you want a top performing board, but that's just my opinion.

[Tom Holck]

Originally posted by JNav89GT
max is about 2.0v. Any more really and people start blowing mosfets. Ask Opp lol. Anyway, I never ever got this board to clock for crap. I'd look elsewhere if you want a top performing board, but that's just my opinion.

Thanks JNav89GT

Tried Asus A8V no high FSB, and bad mem-volt.

Think the problem is, that there are no god 939 for now

:rolleyes:

[pkrew]

I've ran it up to 2.04v and ran spi. It overvolted to 2.1v. Certainly less then ideal, but it is without question the quickest 939 mb atm. The memory speed is phenominal. I have run 3d at 276 1/1 2225716.

Hopefully, in the near future there will be a board that does both.

[Sir Lancelot]

But how have you guys got 2v of vcore for the cpu???

Do you have pics of the mod?

And for the mems, does the 3,3v mod really work or not?