View Full Version : Highest Xabre200 Vgpu people can obtain?
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.
saaya
01-09-2004, 06:17 PM
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?
Holst
01-09-2004, 06:18 PM
I still havent started on mine....
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 ...
faruquehabib
01-09-2004, 06:20 PM
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)
Vlad Draculea
01-09-2004, 06:23 PM
do nothing, the card has enough volts, if you need more, licking mains is recomended.
Holst
01-09-2004, 06:25 PM
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.
Holst
01-09-2004, 06:28 PM
Oh saaya...
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....
Vlad Draculea
01-09-2004, 06:36 PM
the resistor would have to be, if it isnt it cant be considered a resistor.
Holst
01-09-2004, 06:40 PM
Originally posted by Vlad Draculea
the resistor would have to be at least 20w rated and heatsinked to handle that kind of load.
It wont work anyway... you will just get MAJOR load idle voltage fluctuations that will totaly kill stability....
Vlad Draculea
01-09-2004, 07:38 PM
what would kill it is a lot of things and that is good. the pic was too brown for my likings.
MrIcee
01-09-2004, 09:06 PM
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:)
Randi:D
Holst
01-10-2004, 03:20 AM
It shouldt have... am I right that all you did different is to solder to different spots?
MrIcee
01-10-2004, 03:35 AM
I just soldered to the pads of the removed resistor.
Randi:D
What's your 3.3v line Randi? ;)
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! :slobber: ;)
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.
MrIcee
01-10-2004, 07:56 AM
Yes, indeed I have 3.52v on my 3.3v rail my friend:)
Randi:D
saaya
01-11-2004, 11:01 PM
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 :D
YoupY
01-12-2004, 11:25 AM
I switched the 200 ohms VR today for a 1K VR. Didn't matter much.
The voltages seems to max out @ 2.5V, but with a higher 3.3V (3.65) I was able to make 2.6 for the gpu
saaya
01-12-2004, 12:28 PM
2v vgpu is default?
then we really need at least 3v to max them out :D
Holst
01-12-2004, 12:35 PM
Im going to take my card to work tomorrow to have a play at lunch... I just dont have the space or time at home these days..
Ill get you at least 3v by tomorrow saaya :P