8rda VDD max voltage

[deathstar13]

ive had my vdd mod done for 3 days now and ran it at 1.85v for 1 day and have been at 1.98v now for 2 days.

after reading the thread about the deaths of the chip next to the modded one should i hack a heatsink up and as3 it on?

i have to have 1.98v to run 212fsb
1.85 only does 205fsb
im stopping here but will this help or when it goes its just gonna fry no matter what i do?

who here has 2vdd?and how long has it been there?
btw i know the risks so no need to restate them.

[C3]

Temporaily I've got 1,95V and a FSB of ~220MHz in Dual mode.
I think if you've got a good NB HS and the Mosfets are also passive cooled 2V should't be a problem.

[j813]

Hey guy obviously I don exactly understand why r u doin a Mod like this. From reading thru BIOS monitoring Vdd is the AGP voltage. But from all the thread I read it seams it's VCORE the ones being discussed? I'm right? Sory 4 being so ignorant. 1 more thing there's a 1.90 VCORE in BIOS right? Why not use it?

If so is it really safe if I do it right? Choices of POT or fixed resistor?
Anyway not to have V mods for high speeds?

THANKS!

[twiggy]

VDD=Chipset voltage not vcore. ;)

[j813]

Originally posted by twiggy
VDD=Chipset voltage not vcore. ;)

Ah OK.
Where's it located @ USDM? Someone said it can be seen @ Magic Health during boot up.

So if it's d Chipset, u mean were OC'kin d Chipset? Which means more heat @ d NorthBridge?

And it's not connected w/ d high Vcore shutdown problem? http://www.xtremesystems.org/forums/showthread.php?s=&threadid=8344

[Spartacus]

Right, different mods for different issues. The VDD mod increases voltage to the chipset and helps for high FSB overclocking.

I've done both the VDD mod (1.85v) and the high Vcore shutdown fix (OCP mod?).

[j813]

Can't I pass doin VDD mod to gain high FSB?

So how many MODs would surely have to do to have a complete OC mobo?

[deathstar13]

Originally posted by j813
Can't I pass doin VDD mod to gain high FSB?

So how many MODs would surely have to do to have a complete OC mobo? once i add the vdimm mod i will have them all done.but it isnt necesary so ill skip it.2.9v is enough so far.

yeh i have heatsinks on my mosfets and my vcore regulater and the 16th legs trace is cut.i added a 80mm high cmf fan over them also.
btw i have a full size sockerA retail amd hs/fan as3'ed to the nb.

seemsok at 2vdd but ill need 2.1vdd for 220+fsb.
i dont need it yet but my 9700pro should be here soon and i will then.mabey ill pelt it but thats a mess and a pain.

[toofast]

I run mine @ 2.2v for a bit only gave me 221fsb tho .

[deathstar13]

just an update on this mobo,its now dead.
i ran it between 1.9-2vdd
after i wrote a heatsink review/test i put my water block back on and all i got was the "moniter is not plugged in " screen at boot.that is as close to the error i can remember,but is the same one you get with a dead video card.everything else has been tested and the mobo fails.

i have a freind were talking trying a new bios chip in it.
also the ic that you do the vdd mod to is very hot while trying to boot now.i took my grabbers off.

[Holst]

So 17 days at 1.9-2v killed the board.

Thanks for being the gineau pig.

[deathstar13]

ty ill look for my new board in the mail? lol yeh right.
now i have a crappy a7n8x as a fill in for a while.
checking to make sure it wasnt just a bios scramble before i write the mobo off tho.

[B4E]

My 8RDA (step A3) runs at 218MHz FSB without Vdd MOD !!!

My actual Vdd is between 1.568V and 1.582V

:banana: :toast:

CYA

I forgot that my bios is 05/03/2003... fantastic version!!!

[Shroomalistic]

I did the vdd mod, and im wondering if i should do the vmem. After the vdd mod was done i am able to run at 230(460fsb) but cant get any higher with any more voltage which leads me to belive the ram needs more now. Can anyone confirm this for me?

[j813]

someone said that if don't have a VDD mod & enter the 250 FSB i'll get a dead mobo? is there such a thing?

By the way I have NO VDD mod but my board can reach 215FSB is this normal. Like to try 225 but someone warned me here personally not an EPOX tech but just a forum reader, he said he read in a post.

Another question any Twinmos winbond users here? is it safe to push it w/ 2.9V DIMM & @ 225FSB?

Thanks guys!!:cool:

[BrainStorm]

Originally posted by deathstar13
ty ill look for my new board in the mail? lol yeh right.
now i have a crappy a7n8x as a fill in for a while.
checking to make sure it wasnt just a bios scramble before i write the mobo off tho.

deathstar13, did you ever figure out if your board truly died, or just a bios issue? Also, did you ever put the HS on the chip next to the modded one before it died? Curious to know before I redo my vdd mod to get something higher than 1.78.

Thanks.

[Kunaak]

my board has a fixed 534 ohm resistor, and gets me 1.94 volts, day in and day out.
it's been on 20 plus hours a day for a month straight, running 225 on the FSB for benchmarking and 219 for games.

not a problem yet.

[saaya]

yeah my 8rda+ runs 205 without any mod... 2v for 212fsb?... i dont think thats worth the risk 2v for 250fsb yeah, but why risking to loose your mainboard for 7mhz+ on your fsb?

[Caper]

Originally posted by Holst
So 17 days at 1.9-2v killed the board.

Thanks for being the gineau pig.
I´v been running my 8RDA+ at 1.95 vdd 24/7 for about 3 months, no problem...yet.

[LikwidKool]

Mine isn't anything crazy. Just 1.87 for almost 2 months. I have all Mosfets sinked, but not the vdd or the chip next to it. I haven't found anything small enough and have no dremel to make one. They don't seem to get to hot though, atleast not to the touch.

[causticVapor]

Originally posted by saaya
yeah my 8rda+ runs 205 without any mod... 2v for 212fsb?... i dont think thats worth the risk 2v for 250fsb yeah, but why risking to loose your mainboard for 7mhz+ on your fsb?

The quality of the A3 northbridge silcon varies. You seem to have a better chip -- and 2vdd will probably bring you to at least 235MHz with active cooling.

Now me, I can barely get above 195 FSB with 1.6vdd, and 1.85vdd gives me 216 FSB.

I've seen some people get to 225 without problems at 1.6vdd and stock cooling. It's crazy.

Hopefully ther will be more consistency with the C1 stepping. (200 FSB floor on all, better hope)