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Hello!
I´m new in this forum. I´ve read about everyones V-core mods and i´m impressed. Both about you guys who sort thing out and also everyone whos breaking new records. I have a 3850 myself and I would very much like to se a pencilmod for the memory. Does anyone know if such exists?
http://frip.dk/riska/3870gddrcontrolfinalql8.jpg
Try shading this resistor marked in green and blue with a pencil and remember to meassure the vmem all the time so you not get it to high
would this be the same for the 3870?
Yes i would say so
"""@eva2000 try to measure point 1 and ground and see if it has 0 resistance then measure point 2 and 3 and see if the have 0 resistance iφ so the it should be the smd resistor between point 1--2 but you should wait for some one to tell you where the pencil point is for sure or try to lower this resistor 10-20 Ωhm and see if it raise your Vmem"""
it is from the vmod threadon the last page
http://www.xtremesystems.org/forums/...166623&page=13
@ Riska :
how about the resistor on the lower side of the blue marked ?
is this resistors can be shade too, to rise up the memory voltage ?
i try to measure this resistor, the right side leg is connect to the marked IC's leg and the other side is connect to ground..
They are all 3 connected on the side of the chip so i will think so
Thanks Riska, youre the man. I´ll try that tonight. Will let you know about my progress =).
i have a powercolor 3850 512mb and would like to figure out a pencil Vmem mod...but my PCB is different than the one above.
I shaded the marked resistor a bit with a pencil but it brought my Vmem DOWN!!! :( From 2.1 to 1.85v
That aint cool!
http://img86.imageshack.us/img86/4537/img3035ww5.jpg
You should try to shade this one marked in green..
I shaded that resistor and my voltige drooped too. My Sapphire 256 Mb had about 1,92-1,93 at the measurepoint orginal. One loose shade gave around 1,7 V. I even managed to get 0,6 V wich resulted in totalt shutdown.
Ok then i am lost and cant help u
No worries. Thanks for youre help anyway. If you figure somthing else out please let me know.
do you now what resistance R711 has?
i want to change the resistance with a second parallel resistor ;) but i need to now how hight this one is
pencil vmem - R710:
http://img338.imageshack.us/img338/4...ncilvmerh2.jpg
after i penciled i get artifacts much faster than before... my multimeter is broken so i just can say : penciling R711 like in the first picture above makes mine card react on memoryspeedincrease worse than before,..
strange?
i got a HIS HD 3850 with 256MB
I tried out the pencil mod here i pic of what i found out
http://img515.imageshack.us/img515/7...vmembf1.th.png
Shaded R710
4.07KOhms = 1.95v
3.94KOhms = 2.00v
I tried both 1.95/2v and it seems to perform worse in ATI Tool 0.27 artifact test then stock 1.9v
i don't know if its the Mod or just inadequate cooling.
Ah well I'm happy with with i got currently just though I'd give it a shot.
ok : pencil R710 will raise volts? damn and i penciled r711 xD and wondered about pixelfailures -.-Quote:
Originally Posted by Rumon
hmm and what cooling you got on your rams?
and how high could u now do your rams?
My current setup is listed in my Sig (mem@1251) i didn't use the including ram sink for the Accelero as they have a tendency to fall off so its got the stock ram sink.
-----
@ChaOs
I just realized i got the AC S1 its got 4 heat pipes never got around to updating sig ^^
hm i got the 3850 and a accelero S1 ;)+2' 92mm coolerQuote:
Originally Posted by Rumon
thats enought for now...
------------
EDIT
Now mem is 1040..works... but higher wont work...
ONE MORE:
1062 now... ;)
Quote:
Originally Posted by Rumon
Mod confirmed on my Sapphire 3850.
I almost fried my memory with this mod. Stupid as I can be I gave this resistor a good shdade with my computer tured on. After a while i found my multimeter and the Mem voltige was 3,5 Volts!! :rolleyes:
I tured of my computer in a hurry and used the eraser. With a soft shade I landed on about 2,14 Volts. This didnt do any difference in rivatuner, got artifacts as usule around 1050 mhz. Gonna try 2,25 V tomorrow.
Quote:
Originally Posted by Rumon
By the way, Thanks for sharing your findings Rumon!
Damm. If I rasie the V to 2,25 I get artifacts at stock too. Wonder why?
I have the same problem on my 3870 gfx nomatter if it is stock or up to 2.22v it will not go any higher than 1377mhz i think that there is missing something to the vmem mod like a vdq mod or something!
Can somebody please confirm that they have got any higher mhz on the mem with vmem mod?
Yes, that would be good. Im with Riska. Anybody is welcome to confirm higher mhz with this v-mem mod.
Well I shaded R710 ...went from 2.1 to 2.23v
Max stable memclock from 1098 to 1152
Can probably get to 1200mhz if I push the voltage more but 2.23v seems like a lot already for GDDR3, no?
http://img232.imageshack.us/img232/8350/tempqx7.png
Cool. What brand do you have on your card Gurusan? Are you using modded colling on your v-mems to get that high?
It's a powercolor 3850 512mb and I'm using these cheap little thermaltake ramsinks
http://img519.imageshack.us/img519/309/img3108lc3.jpg
with my experence, just VGA with samsung memory can give litle MHZ up after do the Vmod,..
Looking nice, Gurusan. I use somthing like that myslelf.
i think we have the sam board too. Is it a P5K Premium wifi you have there?
I have a hybrid watercooling system at the moment. I can just take a sip if im getting thirsty. Very convinient.
Quote:
Originally Posted by akin
I hear you Akin.
One thing that I find a little stange is that on my previos card a 8600 gt i pumped in plenty of volts and the rams got Really hot, up to 80 C but they were still stable.
On my present card the rams are much more cooler, but they still cant handle any higer speeds / volts. But still I can se a differens of about 20-40 Mhz with /without my ramsinks.
as written :Quote:
Originally Posted by fng77
after vmod with the 3850 it raises max memspeed from about 1000 stable to 1062
but no more...