dfi infinity nf2 vdrop and overcurrent mods

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05-15-2004, 02:52 AM
SAE

Quote:

Originally posted by Vlad Draculea
-te como yo.

Eh? :confused:
05-18-2004, 04:18 AM
cpl1234

Any results yet? Mine stuck at 2.05V (bios reading)

Also, I'm confused about measuring the vcore with a multimeter. I always want to do it but never know how. When you say measure the Vcore on the choke, are you talking about the biggest choke near the socket around the mosfets? Do I just stick the multimeter on the coil?

Also, I've read if I slip, it's dead? Is slip = shorting it with order components?
05-18-2004, 05:43 AM
mad mikee

It's dead jim...

Didn't do modz as things are getting to work :D.
But have killed 2 boards w/ slippage.

Be VERY CAREFUL and if possible keep finger near PSU power switch. If you get it fast enough after contact, you may keep your board. Kill power if you see/hear ANYTHING, don't wait for smoking stuff to happen.
05-18-2004, 09:29 PM
STEvil

I poke at the solder point on the motheboard, must less prone to slippage.
05-20-2004, 03:52 AM
SAE

Hmm. :confused:

Vlad, may I ask why you removed all the important posting of yours??? :(
05-20-2004, 06:35 AM
SAE

1 Attachment(s)

Okay. I am at least gunna repost the missing pics...
05-20-2004, 06:35 AM
SAE

1 Attachment(s)

And the other one...

edit.

I must add the credits go to Vlad for this mod and picture. Bad circumstances... he's not here anymore. If you got questions to ask you'll find him over at XR.
05-20-2004, 02:10 PM
STEvil

If we completely removed the overcurrent resistors... would that be a bad thing..? ;)
05-20-2004, 02:28 PM
SAE

Quote:

Originally posted by STEvil
If we completely removed the overcurrent resistors... would that be a bad thing..? ;)

I definately think so. Resistance would be infinite and thus surely some part will dies/burn. Would be very ugly. I think those are also there in a protective sense...
05-20-2004, 05:24 PM
STEvil

If they are only current limiting, though, removing them should only increase the maximum amount of current to infinite..

Wish I had spare boards to play with... :/
05-21-2004, 01:32 AM
cpl1234

http://premium.uploadit.org/cpl1234/dfi_ultra.gif

This should work right? (of course after the SMD ones are removed) Just want to make sure before getting my soldering iron out.

The reason behind this is

1. I want to have control over the resistance so I can enable/disable when I like
2. I have heatsink on my mosfet with artic adhesive
3. I can't be bothered to calibrate different VRs
05-21-2004, 01:54 AM
SAE

Quote:

Originally posted by cpl1234
http://premium.uploadit.org/cpl1234/dfi_ultra.gif

This should work right? (of course after the SMD ones are removed) Just want to make sure before getting my soldering iron out.

The reason behind this is

1. I want to have control over the resistance so I can enable/disable when I like
2. I have heatsink on my mosfet with artic adhesive
3. I can't be bothered to calibrate different VRs

Don't do it this way, as every smd resistor depends on other electrical factors, and trimming them over one pot would be bad the the onboard circuitry. Vlad lined out before (shame you cannot read it anymore) that it would be dangerous...

Do it with smds at 3.7k or 4.4k and you'll be fine. No adjustments anymore (I have 4.7k ones). And I also have adhesive sinked the mosfet transistors...
05-21-2004, 11:35 PM
I(illa Bee

Good looking mods... i cant seem to find anywhere it says what amount of resestence to use.... ?

What are people useing for the Vcore? Do you have to make the Vsence the same as the Vcore? im a little confused on hoe you go about tunning that in. (2 pots for one goal)

What do i replace those SMDs with? 4.7k resistor?

What about the the Overcurrent mod? it says to set it and forget it, but what to?
05-22-2004, 03:19 PM
STEvil

Quote:

Originally posted by SAE
Okay. I am at least gunna repost the missing pics...

see that 8-legged chip next to #2? That thing gets really hot!!! :eek:

i suppose the one next to the northbridge heatsink may also get just as hot.. but after burning my finger (this is with over 360cfm of airflow) on the first one i didnt bother trying the other.
05-23-2004, 04:59 AM
SAE

Quote:

Originally posted by STEvil
see that 8-legged chip next to #2? That thing gets really hot!!! :eek:

i suppose the one next to the northbridge heatsink may also get just as hot.. but after burning my finger (this is with over 360cfm of airflow) on the first one i didnt bother trying the other.

Yeah. I already supposed to cool these driver ICs... the middle on of the 3 should indeed be the hottest...
05-23-2004, 10:48 AM
Evil_Spork

heres a better pic of the vdroop mod.

http://woodturnedcreations.com/es/dfi/Vdroop1.jpg
05-23-2004, 03:12 PM
SAE

Hehe, Evil, your pics are everywhere ;)
05-23-2004, 04:08 PM
Evil_Spork

hehe, i figure if i can help people out with better pics i will! :)

besides i enjoy taking them, its a kinda hobby for me.

if anyone has any requests for pics of parts i have just let me know ill supply them. give me a day or two and ill have similar pics to the one above. feel free to ask :)

infinty pics ask ASAP, i have an extra board i might be sending back soon.
05-26-2004, 07:44 PM
damsxx

hello,

well, i have read the 6 page of the topic , but i don't understand how to do the vcore mod, because my english is so bad and your discussion about vcore mod is so blur for me :D

Can you please make a step-by-step how-to for me? I need all details of your VCore modding adventure :D
Please PM me,

with my infinity i have do this :
http://membres.lycos.fr/damsxx/35s.JPG
http://membres.lycos.fr/damsxx/fsb250prime-end.JPG
http://membres.lycos.fr/damsxx/2777prime.JPG

so i need more vcore to go up !!!!!

thanks ;)
06-19-2004, 07:14 PM
STEvil

evil spork - what is the original resistance of the resistors for the vdrop / vdroop mod and does anyone know why making the resistance 0 would be a bad thing?
06-20-2004, 01:34 PM
SAE

Quote:

Originally posted by STEvil
evil spork - what is the original resistance of the resistors for the vdrop / vdroop mod and does anyone know why making the resistance 0 would be a bad thing?

2.4kohm iirc... but dunno exactly. :)

If you short those OCP resistors you'd allow full current to pass through the circuits and go directly to the CPU. I would consider it a very bad thing if the CPU was grilled by too much current ;)
06-20-2004, 07:05 PM
STEvil

http://www.xtremesystems.org/forums/...048#post451048

I was looking at evil_spork's pic wrong.. my bad.

All I want is a stable vcore... :D

Pin 4 to choke is what that pic looks like, is that correct? All I have is a 10k VR... wonder if thats too low?
06-21-2004, 12:26 AM
SAE

Quote:

Originally posted by STEvil
[url]Pin 4 to choke is what that pic looks like, is that correct? All I have is a 10k VR... wonder if thats too low?

No. That also wrong :D

It's pin7, and that's the vdrop mod. It will drop your available vcore too, but make it more stable (less fluctuation).

The OCP mod is changing those SMDs to 3.3-4k (more does not really help, dunno if it does not even worsen it)... you would get more current flow to the cpu mosfets thus supplying more to the cpu...

1k VR is not too low for vdrop. I am using a 4.75k fixed res. But you'd have to put the vcore mod to pin7 as well to compensate the decreased vcore (vdrop)... set vcore to 1.825V in bios and turn up your vcore watching the voltage in bios. You should be able to get a more stable voltage output this way too.

Gluck, pal. :thumbsup:
06-21-2004, 08:42 PM
STEvil

Counting from the left its pin 4.. ;)
06-21-2004, 11:58 PM
SAE

Quote:

Originally posted by STEvil
Counting from the left its pin 4.. ;)

:lol:

But you should always count from pin one... ;) (watch the pit in the chip)

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