8RDA/+ chipset mod?

[Jeff]

The Vdd(chipset) mod described in this thread will VOID YOUR WARRANTEE!!! Only attempt the mod if you understand this and are willing to risk damaging your board since any voltage above stock can damage the voltage regulator and/or northbridge(and video card in one case). PROCEED AT YOUR OWN RISK!!!

I've never done a chipset mod so a little help would be appreciated. Does anybody know what chip is being used to regulate the chipset voltage? And I guess another good question is where can you measure this voltage?

I'm pretty sure once we find these 'simple' things out, a mod won't be far behind.

[water_cooler 20]

I been tring to find a mod for this 2 since i'm going to cool it with chilled water.

[AKRedneck]

Here is what I'm guessing is the chipset voltage regulator..

Just below and to the right of the southbridge, labeled LD1117.

It has a tab on top and 3 legs on the bottom.. Measured the Vout at 1.598v, Vin at 3.208v, and Ground at 0.349v

Per the datasheet it is the SOT-223 packaging.


Now, how do we adjust Vout?...if this is even the correct voltage regulator..? hmm, pot from ground pin to ground???

THIS is the datasheet for the voltage regulator in question....

[Caper]

Hmm...I found it I think.
Just above Bios chip.

Mine is labeled:
ATC 213
1117

[AKRedneck]

Originally posted by Caper
Hmm...I found it I think.
Just above Bios chip.

Mine is labeled:
ATC 213
1117

Yep, that would be the one I'm looking at.. If you have a multimeter, could you measure the voltage on yours?

[Caper]

I have no multimeter here right now.
Just got home after working nightshift.
I can pick one up and measure when I get up...but I do need instructions where to measure.
This is NOT my stuff

Edit: When looking at the datasheet I found it.
I´ll do it when I get up from bed.

[TPR- Darwin]

Jeff why do you have to put thoughts in my head like that ?

I really dont need to start prodding my P4T533 with a voltmeter................oh go on then

[Learn]

hello


the regulator is the IR 3037A (at the bottom of the dimm)

DATASHEET here

a friend have doing this mod.


it 's the FB pin to ground

[water_cooler 20]

do the nb and sb have diffrent regulators

[Learn]

i have doing this mod (for verification)


pin 1 (fb) with 50k poti 18rpm

i have a 8rda+ revision 1.0

[Holst]

nice 1.

What do you have to set the 50k pot to to get 1.9v ?

Are you going pin 1 to pin 4 ? (with 1 being Feedback and 4 ground)

[muzz]

Looks good.. I'kll be watching this one

Good Job Learn.. thanks for the heads up!

muzz

[Learn]

no prob


i have measured 550 ohm for 1.90 v of the vdd

my ground is in the molex 4 connector


pin 1 of 4 must be working


i have changed my 50k for an 1k poti


i have turned my 50k poti to fast ... 2.41v (in the bios) lol !



sorry for my bad english

[[H]AMDGamer]

so witch is it the LD1117 or the IRU3037?

[Holst]

I allways use cermet pots as you can get much better resolution, so your less likely to accidentally overvolt by loads.

A 1k pot will make things safer.

At least you didnt blow anything at 2.4v

[Holst]

its 3037

[[H]AMDGamer]

if he says 550 ohms give you 1.9 volts i can just use a 550ohm resistor from pins 1-4 correct?

also are you people soldering on or uing those SMD grabbers?

[Holst]

Id never recomend using an SMG grabber long term, ive found them to move and give bad contacts.
There handy for testing stuff out, but thats all.

Good old solder for me.

I havent done this mod yet, Learn has put 500ohms between pin 1 and ground (molex connector in his case)

Id prefer to use the chips own ground (keeps things constant) so id put a 1k cermet pot between pins 1 and 4, or if you can onto surface mounts connected to those pins (my prefered methood as soldering to the IC is harder than a surface mount resistor)

[[H]AMDGamer]

holst i got a Huge thread about the 8RDA+ over at [H] if you want to check it out http://www.hardforum.com/showthread....hreadid=543944

right now im stable at 200 FSB Synch and ram timings @ 4-2-2-2 but anything over 200FSB is not stable now i have had a 200FSB barrier on my 8RDA+/ KX7-333R and A7N8X im suspecting its my §§§§ty 300watt PSU so i orderd the TTGI 520 watt PSU

the vdd on my 8rda+ 1.56-1.58

im guessing though i have a PSU problem im hoping my new 520Watt will fix it up and if not im gunna do this mod

[Caper]

Originally posted by Learn
no prob


i have measured 550 ohm for 1.90 v of the vdd

my ground is in the molex 4 connector


pin 1 of 4 must be working


i have changed my 50k for an 1k poti


i have turned my 50k poti to fast ... 2.41v (in the bios) lol !



sorry for my bad english

Thanks for the great info

With this modification, are you able to run higher fsb than before?

[Jeff]

Originally posted by Caper
With this modification, are you able to run higher fsb than before?

That's the $1,000,000 question!!!

I can't wait to get home tonight and find out for myself. GREAT WORK LEARN!!!

[Caper]

Let me know how it goes for ya, I can´t do the mod yet.

Happy New Year!

[DoGMaN]

I'm dying here guys. Does this have any payoff?

[Jeff]

The Vdd(chipset) mod described in this thread will VOID YOUR WARRANTEE!!! Only attempt the mod if you understand this and are willing to risk damaging your board since any voltage above stock can damage the voltage regulator and/or northbridge(and video card in one case). PROCEED AT YOUR OWN RISK!!!

Ok, a 750 Ohm resistor gives 1.79v. I'm booting into Windows now...
(again, GREAT WORK LEARN!!! )

[Jeff]

My first stable PiFast run at 207FSB!!! WHOO-HOO!!!

This is the first time I attempted this at 207 and did NOT have to re-install Windows because of corrupt files!!! :tearinmyeye:



Onward and upward...