8rda+ vcore mod

[maxwell]

have some ohne a idea how it went?

the voltage regulater is iru3055

becouse i need more vcore to overclock with LN2 and then i need more vcore then 2,22 :D

[gobbo]

Being honest, i wouldn't like to give any chip more than 2.2v, even with LN2 cooling!!!!!

I only know about the VDD mod to the 8RDA+, but hopefuly some1 on here knows more than me!

[maxwell]

vdd mod is done
and
vmem mod is done too

but i realy need more cvore the 2,2 wenn i want to pass the 3,2gig or higher and more vcore is evertime good :D

[gobbo]

Well good luck to you, might be worth searching the forums to see if anything comes up?

[KS1]

if you insist, see Vcore mod of 8K9A2 in this forum
it's the same chip

[bldegle2]

may yer cpu RIP.

i have found out the increased vre has a diminishing return of MHZ with these newer CPU's.

this is how i find the limits. run her first on air, find the limits, MHZ and vre.

then stick her in a vaporphase unit, stay @the vre you used on air, clock on.

no amount of vre will get my 2700+ stable @2940, but when i run her @22x133, it comes pretty close, the other setting i have tried are 13x223 (220max stable), and 15x196 (193 stable), this on an 8k3a+.

better ram gets rid of the tearing somewhat, but it comes into play sooner or later.

i have two Corsair modules on the way (Pc3500), gonna see if it makes any difference from my Sammy pc3200 stuffs.

baldy:D

[Method Man]

I would also like to see more Vcore than 2.2V...I know they can take the voltage because I usted to give my 2400+ 2.3V all the time in my old a7v333

[maxwell]

maybe on the wE i have time to mod the vcore...

[Arz]

After a little study, I think it would be possible to use the same method as with Epox 8K9A2, as they have the same chip controlling the Vcore. So between pins 3 and 17 use a resistor with some value. With 8K9A2 they used ~1k, but if someone tests this, should he start with 10k or maybe even more to be on the safe side.

And again this is just a conclusion from Vcore mod for Epox 8K9A2, with the same chip as the 8RDA. I haven't done this mod, and will not take any blaim, if any1 blows their 8RDA when testing.

[cpulloverclock]

www.google.com ---> www.irf.com/product-info/datasheets/data/iru3055.pdf ---->

pin 3 and 17

http://membres.lycos.fr/cpulloverclock79/iru3055.JPG

[cpulloverclock]

Originally posted by Arz
After a little study, I think it would be possible to use the same method as with Epox 8K9A2, as they have the same chip controlling the Vcore. So between pins 3 and 17 use a resistor with some value. With 8K9A2 they used ~1k, but if someone tests this, should he start with 10k or maybe even more to be on the safe side.

And again this is just a conclusion from Vcore mod for Epox 8K9A2, with the same chip as the 8RDA. I haven't done this mod, and will not take any blaim, if any1 blows their 8RDA when testing. grilled :(

[Arz]

Damn! Sorry to hear. :( I studied the RDA+ today to find out how the 2.2V Vcore can be taken out without Overcurrent shutdown by he overmentioned IRU3055, but the schema is quite complex. Found the resistor though, but there's also connections, that went away from circuit involved. Well, I've no extra money to spend, so I'll be satisfied to my RDA+ with Vdd mod and 220 FSB rock solid.

[water_cooler 20]

Read this for the vcore modhttp://aoaforums.com/forum/showthread.php?s=&threadid=12809
enjoy:smileysex :toast:

[Holst]

LOL, just realised I did OVP mod on 8rda+ and then forgott about it.

Quoting me :P


Ok thats all fairly straight forward, thanks for the info Jeff.

On 8K9A2+ people found that 1k between pins 3 and 7 worked.
3 being the feedback pin and 7 being ground.
Id start with a 10k cermet pot set to 10k and work down slowly, if you cant get the required resolution go to smaller pot. Be VERY carefull when ajusting it especially when ajusting at the low end (you may want to add a 500ohm resistor in series to prevent shorting)

The OVP on the chip is 15%, but you shouldnt need to exceed 10% (2.4v max)
If you do go over that then you might need to add some resistance to pin 16 (disconect the leg and add 500ohm or so)

Obviously It goes without saying that this mod is extremely dangerous and may kill your board cpu and anything else connectd to your PC (or in the surrounding enviroment :P )

I wouldnt recomend soldering directly onto the Vreg pins as its so awquard, instead follow the traces and try to get onto a surface mount instead, im not sure how easy that will be as I cant look on a board to try it)

Dont try using a SMG grabber, ive found them to be allot more trouble than there worth, a secure solder joint is the way to go.

Dont go over 2.2v unless you have sufficent cooling (vaporphase only unless your nuts)

Please do be carefull if you try this, I havent done so myslef (and I wont bother either, 2.2v is too much for my cooling)
this is obviously not a mod epox recomends doing and is totaly out of waranty.

Did I put enough disclaimers in ?

[muzz]

I thought it said you haven't done it.......
????

I must be missing something here Holst......

[Holst]

No... I didnt do it, but Id forgotten that I even new out how to...

Sorry I just thought it was funny.

TBH I didnt think the OVP mod would be needed, let alone that it would help some people run at "stock" voltages.

There are quite a few things id like to try on my board now, but moving my watercooling is such a pain, i think ill wait for a good excuse like new memory.