I'm a bit pissed 'cause I was already trying to fry my Xabre200 except... I can't get anymore Vgpu. It seems that 2.25v is as much as I'm getting using the mod I did and that just ain't cutting it.
It has helped me a lot since I can now run a 290 GPU but my memory still suxors and 230-235 is about all she's got... even when blowing -10f air on her with a Vantec Tornado at 14v.
For those that don't know... I killed my A64 screwing around with this card. I have made it my goal to catch it on fire and take it out. That's really the only way for me to cleanse my soul of this beast. It's going to pay I tell you... it's going to pay.
is there no way to short the 3.3v rail straight to vgpu with a resistor in line? could the mosfets on the board keep the volts stableenough for the gpu?
But I promise ill get in into a benching system on sunday and do the VGPU and VDDR mods (I "think" I have VDDR, but I want to test it before publication)
If 2.25 is all I can get from the GPU then ill mod that as well...
In the mean time remove R222 Jeff and make its resistance higher.... this should also give more VGPU ...
i can get 250 on the memory with no cooling whatsoever on them...not even ramsinks or a fan blowing on them. i still need to mod my bios, though, to pump them past 250/250
(waiting on my a7n8x deluxe to come back from rma)
Originally posted by saaya how did it kill your board? is the cpu alright?
is there no way to short the 3.3v rail straight to vgpu with a resistor in line? could the mosfets on the board keep the volts stableenough for the gpu?
Yep..
Cut the legs on BOTH mosfets.
Then solder a BIG wire where shown.
And put some capacitance between the tab and the ground plane.
I wouldnt necicarally recomend doing this mod... as you may just toast the core... 3.3 is quite an increase.
You cant just put a resistor in the wire to drop the 3.3 down to ... say 2.5 as the current will change under load... so you may have 2.5 unloaded and only 1.5 under load.... or to get 2.5 under load you may need 3.2v at idle.
You need a regulated supply... so id try the mod I recomended to Jeff first using R222 rather than this more extreme one....
I'm not sure if doing the mod the way I did it made any difference, but I'm running 2.5v as we speak with the original mod, and I got more if I need it. The highest I've confirmed so far is 330Mhz GPU, with more in reserve for a later date
I'm running with 3.30v on mine right now. I'm going to switch over to my power supply that I can change this rail to see if that makes a difference. I'm thinking it will as you soldering to the resistor pads really shouldn't make a difference(but I wouldn't rule it out ).
And 330! That's a pretty darn nice core you have there. Too bad about the mobo though. Like I said, I'm using an 8RDA+, single channel, at only 200MHz FSB and I broke 8.6k. You should be well over 9k!
Increased the rail to 3.42v and now I'm at 2.36v on the GPU. Only problem is the 8RDA doesn't like to boot with a high 3.3v rail. I thought I killed another "something" but as soon as I turn the 3.3v rail down to under 3.4v the computer boots fine. Then you just turn it back up.
Ok, at 2.36v I can now bench 324 GPU. A nice improvement but I think I'm going to use the other mod Holst is talking about with R222. The 8RDA is acting funny with a high 3.3v rail.
weird about the overvolt protection... i have a kt266a board that wont boot at high rails either, but my a7n8x works better than ever with higher rails (14.1/5.8/3.7).
so it sounds like my high 3.3v rail will give me enough vgpu to kill the card? excellent
It's going to pay I tell you... it's going to pay.
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I thought I killed another "something" but as soon as I turn the 3.3v rail down to under 3.4v the computer boots fine. 
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