what will this achieve persivore? Does it cause the circuit to go substancially higher?
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what will this achieve persivore? Does it cause the circuit to go substancially higher?
The higher the 3.3v line is, the higher you will be able to run Vdimm :). Vdimm can go as high as your 3.3v line minus ~0.2vQuote:
Originally Posted by Johnny Bravo
ahh right, i see ur point, I'll give it a shot and see how it goes. Whats the max a 3.3v can be safely lifted to?
The max I would run the 3.3v rail at for 24/7 usage would be 3.7v, but up to 3.9v should be ok for benching.
So it is connected with the 3.3v rail? If I don't mod the psu I wont be able to achieve higher then 3.3v?
You are correct :)Quote:
Originally Posted by NiCKE^
So there is no other way to make a vdimm mod which doesn't requiers that?
Something like do 3.3v rail mod but use the 5v rail instead but in some way regulate the 5v which goes to the vdimm cap with a VR.
Maybe just my imagination playing now? :P
Isn't 3.9V - 0.2V = 3.7V enough for benching? :)
I am not sure but theoretically you can feed RAM from 5V using VR
I spoke a bit with persivore and I'm going to make a little mod to see if we can get 5v to feed the memories.
cant you mod the psu with 3.8 3.9 vio , and make mod vio = vddr ?
that s what i had on my old giga nf3
I wont mod my PSU. Easier to mod the board.
whats the mod NiCKE^, any details on it yet?
I can say it works! :P Succesfully I did the mod, I will post pics in a few.
First:
http://www.xtremesystems.org/forums/...1&d=1134850120
2nd
http://www.xtremesystems.org/forums/...1&d=1134850120
3rd
http://www.xtremesystems.org/forums/...1&d=1134850120
4th
http://www.xtremesystems.org/forums/...1&d=1134850120
Final
http://home.no/nickeh/finale.JPG
BY DOING THIS MOD YOU WILL BE ABLE TO SUPPLY AS MUCH VOLTS TO YOUR RAMS AS THE 5V RAIL CAN HANDLE!
I'm not responsible for any dead hardware because you have made this mod and killed something.
Wow, interesting :)
But I will stick with 3.3V mod. And I think it is easier to mod PSU 3.3V line to make it adjustable :)
Looks good, cheers NiCKE^ and persivore :up:
Hm if someone tries this mod please report results about overvolting.
Seems like I got some big issues, running 3.3v idle will give 3.8v during load!
I don't know if it did this last night but I believe it didn't.
Me and persivore (mostly pers) are trying to solve this problem somehow.
By the way, is it possible to mod any motherboard in a similar way by connecting 3.3V to capacitor leg (the one which reads vdimm) like in the picture of the 1st post?
Yes, I believe you can do it on any motherboard. I used it on the MSI K8N NEO2 s939 motherboard.
Cool :D
But what if there are several capacitor legs that all read vdimm? Which do I use then? Is there any difference?
Dunno, I just look at the pics what others have done :)
The problem with my P4GD1 mod is that the MOSFET get so hot that the lod warms up and gets liquid.
That's probably the cause of droops and suddenly very high volts.
vdimm mod ok like first post
3.85vdimm with 2x256 bh5 ok on p4gd1 :)
when the vdd mod ? :D
Right guys, i've build a variable vdimm power board and want to confirm that the best way to connect it would be to solder where the vdimm measurement point is. Should I remove the existing MOSFET or not?
http://www.xtremesystems.org/forums/...id=40162&stc=1
It would probably work ok if you just connect the new power supply to the Vdimm read point on the MOSFET. If you want to be sure that no damage will be caused, remove the Vdimm MOSFET, but it should be ok without removing it IMOQuote:
Originally Posted by Johnny Bravo
Cheers Persivore, have installed external power board and now have super stable vdimm supply, max swing is 0.005v @ 3.5 volts on BH-5 :D