Got a DMM on the way, Haven't looked over this thread cos it'll take hours, but i have a Sapphire 4850 with Dual Slot cooler, non reference board.
Are there any pencil mod's for this card?
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Got a DMM on the way, Haven't looked over this thread cos it'll take hours, but i have a Sapphire 4850 with Dual Slot cooler, non reference board.
Are there any pencil mod's for this card?
Hi all this is my first post on this great Forum!!!
I have a Sapphire 4850 Toxic
I have started by testing the stock core voltages and I have then done the Bios mod.
Now a few things are puzzling me.
The core voltage after the bois mod hits 1.27 Volts and the card will clock to 795 MHz
I thought the most the Bios would give was 1.21V at the card.
But the strange thing is the memory. The card has Samsung 0.8 ns chips which are clocked out of the box at 1100 MHz but the data sheet from Samsung quote they are 1200Mhz chips with a max voltage of 2.05 +/- 0.05
My memory voltage is 2.13v at stock and the chips won’t even do 1105 MHz without crashing?
Is there a way of getting the memory voltage down or do you think raising it up a bit more will help the chips clock higher.
Thanks.
Finally I was able to get an account with this webpage. Anyway I have a HIS IceQ4 4850 1gb version and I want to know where do I do the pencil mods for that card?! I read every single page on this forum and I only saw it being mentioned that someone had found out a way to do the vmod for my card. The person even put up the results of benchmarks but did not include any pictures of his/her card... Please help me!
Thank you Ceemic.Only one more thing is necessary:measure point vgpu.Quote:
Originally Posted by ceemic
If i get that i will start do work and came with results.
For the uninitiated, make sure to first set your VR to its highest resistance before adjusting it down to the desired level while monitoring the voltage. You do not want to start with the VR set to zero ohms.Quote:
Originally Posted by gurusan
Disclaimer: Using this mod will void your video card warranty and you alone shall be liable for any resulting damages. PERFORM THIS MOD AT YOUR OWN RISK AND DON'T TRY THIS IF YOU CAN'T AFFORD TO LOSE THE CARD!
http://img15.imageshack.us/img15/845...e4870vmod2.jpg
EDIT: Confirmed working mod with updated info provided by Vatos Locos :up:
awesome ^ syl :up: :up: thanks for the vcore mod
mines already 1.36vcore @ default
ill give it a shot in a minute.. but gotta find a way to increase gpu clock @ ccc
how about a vmem mod? :)
does up6206ak also regulate vmem?
hello guys, i have softmoded gpu and now i want to pencil mode gpu, i measured with DMM
http://img230.imageshack.us/img230/5879/projectdr9.jpg
here is pic, every time i pencil it voltge ram doesnet change :(
also i have maeasured MVDDC and MVDDQ different(1.66v and 1.55v) but are they need to be the same?
pencil or 5K vrs @ blue marked caps
id recommend 3.3K fixed resistors @ each
so i need to pencil mode yors blue marked and not that what i marked on pic for pencil mode??
yes
http://www.techpowerup.com/articles/...voltmods/153/3
if vr/resistor works so shall pencil :up:
just be careful.. pencil kills mem before anything else
CEEMIC, the circuit between FB and COMP is closed with no connection to GNDQuote:
Originally Posted by dragubogdan
Whatever the default resistance between FB and GND is 7.24Kohm mean i must use 145Kohm VR.
Here the circuit.
Attachment 94495
dragubogdan, FB is definitely connected to GND through some resistors.
100k VR works fine.
You're welcome! Have you try using TechPowerup's Radeon Bios Editor to raise the CCC's OverDrive limits? I've modified mine to allow GPU clocks up to 990MHz.Quote:
Originally Posted by NapalmV5
Vmem is usually controlled by a separate and less complex voltage regulator IC...I'll see if I can dig up some info when time allows.
thanks whenever you got time
i tried "change to these values" as soon as i got the card but no worky
what i mean by no worky.. after flash when driver loads @ os bootup the screen goes blank and artifacts badly shortly afterwards.. i didnt touch clocks/anything.. "change to these values" only change
my reference 4870 1gb sapphire did the same until i flashed it to the powercolor bios
btw i tried your vcore mod on my toxic 1gb and works great :up: just need vmem mod
i have new lower esr caps coming later in the week.. see how that goes
as for the vmem mod i didnt see any convincing vmem chip lol so ill take a closer look
i have tried pencil moding that but when i measured vddc and vddq they were still same??Quote:
Originally Posted by NapalmV5
what pencil you suggest to use??
^ #2
Quote:
Originally Posted by gurusan
Quote:
Originally Posted by syl
yeh those 2 ^ chips by the mem chips are both up6109 mvddc/mvddq
edit: found it: up6109 pdf
http://www.upi-semi.com/ProductFiles..._DataSheet.pdf
Thanks Napalm :up: Should be a simple matter of tracing out pin 6 for the mod.Quote:
Originally Posted by NapalmV5
connected both mvddc/mvddq (pin 3 to pin 6) with 22k resistor and now ~1.88vmem up .3 from 1.58
havent tried any other resistance so id say its safe to say a 100k vr to start with
it be nice to have solder points on the back of the card though
Thanks for all the info syl
ceeemic , is not working;i solder to the first resistor from FB a VR 100K to GND.Quote:
Originally Posted by ceemic
card not even start and i set the VR to 100k before connect.
dragubogdan, can You show a picture from Your mod?
The first pic is from Duncanoc , i just put my card in caseQuote:
Originally Posted by ceemic
Attachment 94555
and this is vr but no wire , i just remouve it
Attachment 94556
i hope is clear , if not tell me and do more pics
Which pins from VR You used?
Did You check that this point was directly connected to FB pin?
first pin (our look) is unused ,midle pin is conected to GND and last pin i used to go to FB
yes i checked with DMM and have 00.4 ohm on scale 200ohm between FB pin and that resistance
I dont understand what go wrong
a ,VR was turned to maximum(99k)