yeah I edited my post a few minutes ago...lol. I found the pdf for the chip but I'm no expert, I want to see what the real modders say to check, I'm sure a mod is possible but I wouldn't want to give you the wrong advice.
Printable View
yeah I edited my post a few minutes ago...lol. I found the pdf for the chip but I'm no expert, I want to see what the real modders say to check, I'm sure a mod is possible but I wouldn't want to give you the wrong advice.
PanMaster take a good photo strait to the Nexsem Chip i know where the FB pin is but i cant see the card in this angle
take a better pic from this side
Whats the FB? Which part needs shading in?
Heres a quality picture taken while the card was still in the PC:
http://homepages.nildram.co.uk/~zen1...ge/nexsem1.JPG
I've found this, its an x1950 but its the same Nexsem 2415 chip
http://img.photobucket.com/albums/v4...nexsemvmod.jpg
Thank you for your advice
the FB Pin is the Feedback it controls the Vcore on your card the pic is correct this is the Fb pin so now you have to find the resistor that is connected with the Fb pin on your 3850 for start and then i will tell you what to do ;)
just take a multimeter and see witch resistor measures 0Ωhms with the FB pin
post a good pic of your card it will help us a lot :)
ok try measuring those resistor and see witch one shows 0Ωhms with the FB
if you cant put you multimeter prob on the FB pin because the are tiny you can put it on the capacitor that is connected to the FB see the trace line in the image that leaves the FB pin and goes on the tiny brown smd capacitor
Can somebody show me where i can do pencil mod on my HIS 3850 512mb IceQ TurboX:
Photos here:
http://i4memory.com/reviewimages/vid..._IceQ3_002.JPG
http://i4memory.com/reviewimages/vid..._IceQ3_012.JPG
http://i4memory.com/reviewimages/vid...IceQ3_004.html
http://i4memory.com/reviewimages/vid..._IceQ3_003.JPG
http://i4memory.com/reviewimages/vid..._IceQ3_006.JPG
Thx friends :)
are you fully alright man?? i dont have cash to buy another card dude uhuauhuah
yep, completely sure. if you're wary, you can wait for others to confirm what i said and it won't hurt my feelings one bit.:up:Quote:
Originally Posted by victorbr
Have anybody got meassure and voltage point to Gigabyte HD3850 256MB ? (Red PCB)
thx friend,i don't wanna hurt your feeling ,i am just having a bit of caution with my vga :) ..i don't wanna fry it :DQuote:
Originally Posted by Random Murderer
hey, no problem, i completely understand.:yepp:Quote:
Originally Posted by victorbr
the thing about pencil mods is that if your card blows up, erase the mod and rma it! while some may call this irresponsible or unethical, i believe that since we paid for it we should be able to rma it. the big manufacturers have money to replace it, we don't.
i believe there's someone here with that same card...Quote:
Originally Posted by wodnik
dig through the last few pages of the thread and i think you'll find your answer.
Can you show me vgpu measure points too?? i did the pencil mod and seems like didn't have sucess...
http://img.photobucket.com/albums/v6...3850_IceQ3.jpgQuote:
Originally Posted by victorbr
make sure the pencil lead took. did the resistance of R1222 drop?
vgpu is on 1.28v?? what i have to do??
for VGPU, set it to VDC or DCV. for resistance, set it to 20kΩ.Quote:
Originally Posted by victorbr
Damn!..i shade that again and no has effect on voltage..:mad
where can i do this new mod in my vga??
http://img205.imageshack.us/my.php?i...870pmodsl4.png
thx!
I used 100k ohm set to 90k ohm and my card is burned...Do I have to use 500k ohm and what is resistance for let's say 1.5v?
HAHA i am very very happy guys..pencil mod done! now i am testing..later i put my result :D:D:D:D..THANK YOU Random Murderer you are the BEST! :D
You must have done the mod wrong mine 3870 can handle over 1.9v without burning and i am using 100kohms
Please somebody show me where i have to shader for vmem pencil mod too?? thx guys :D
If u read the hole thread u will find it
Hey guys..somebody knows what is that "on/ke" key on top of the HIS HD3850 512mb IceQ TurboX????thx..i have searched and didn't find anything..
http://img139.imageshack.us/img139/4594/hisai2.jpg
NTSC/PAL switch
Finaly I got it.
I voltmoded my PowerColor HD3850 512 PCS and applied a "little" bump to 1.38V VCore. I changed the bios to the HIS HD3850 ICE3 (ver 071).
I also changed the "two wire" Zerotherm by an original "3 wire" Zerothem 810.
Now I got my HD3850@864Mhz Core and 1080 MEM. (about 30% core OC). 45° idle and 65° full load.
With my P5B Deluxe, e6600@3.6Ghz I'm near the 12500 points in 3DMark06 (12247). I'm Happy....:D
You set trimmer on max,100k ohm? And then how much was the voltage ?Quote:
Originally Posted by Riska
At 100kohm it is about 1.38vgpu
You must have done something wrong
i'm thinking maybe he measure the wrong two points on the trimmer, so that when he thought he was at 100KΩ, he was actually at 0ΩQuote:
Originally Posted by Riska
Got Gigabyte HD3850 to mod- it has non-reference pcb with Nexsen PWM controllers on it.
Card has Zalman cooler and blue pcb, but I think same mods can be used for other cards with same PWM chip.
Vgu mods- I measured 10K resistance between GND and FB pin.
This is without mods!
Red line is connected to FB pin and any point of it can be used for "fooling" feedback voltage to chip.
http://www.oc.pri.ee/vmods/Gigabyte_...a3850_Vgpu.jpg
Vmem mods- same story.
http://www.oc.pri.ee/vmods/Gigabyte_...a3850_Vmem.jpg
Actual mods on extra pcb:
http://www.oc.pri.ee/vmods/Gigabyte_..._3850_mods.jpg
and schematic diagram:
http://www.oc.pri.ee/vmods/Gigabyte_...ga_3850_sh.PNG
Voltage monitoring poins are knows already I think.
Mods working fine, Vgpu is limited at ca.1,75V with extra resistance on Vgpu, if you need more, use resistor with lower resistance.
that's some ace-modding there!Quote:
Originally Posted by Jaan
NICE WORK!
I am that lucky guy who got this mod on my Gigabyte HD 3850 512mb card. :D
Right now 860mhz on core is max what i get out with this "locked" bios. Without that mod and 1,256 v i got only 805 mhz max stable under benching. Memory is Hynix 1.4ns and right now i could get stable bench clocks with RTuner 1044mhz with stock vmem.
3DMark06 skore is 13568
http://service.futuremark.com/compare?3dm06=5461767
Not bad :cool:
Now in need of a good bios mod. So can go for 1000mhz.
And about temps. I have default Zalman cu700, bench temps i saw in load with RT monitoring were 81C. But those were with very high vcore, wich i just put on, knowing that those will be enough to pass with 860 core speed. Now try to lower them to optimize.
Thanks Jaan!
I also have this same Triplex 3850 with 2415 PWM.Quote:
Originally Posted by Vatos_locos
EDIT - I measure the resistance between the FB pin and ground (when the card is off ;)) and multiply by 20 (also seen 30 - 50 being used) to find the correct pot to use?
Thanks
could someone clarify what is that buzzing noise coming from video card when clock is big or framerates are high.
and is that dangerous if i can hear it almost all the time?
if it's loud, it is definitely something to be concerned about.Quote:
Originally Posted by raibemunn
if not, it's just the noise of lots of power;)
well its producing that sound even with default clock and current (under load).
but now its pretty much constant when playing. how is one supposed to fix it? :rolleyes:
you have two options. rma it, or do a total recap.Quote:
Originally Posted by raibemunn
Hynix mems have 1.834V by default. How much voltage could it handle and what do you guys think would be normal to run for 24/7.
http://www.xtremesystems.org/forums/...1&d=1203732548Quote:
Originally Posted by Vatos_locos
The third resistor down is connected to the FB pin.
FB pin to ground is 5.72k
Resistance of the actual resistor is 3.64k
Jimbo Mahoney try to shade with a pencil a bit the third resistor and see if the core can handle more Mhz if so then use a 100K Trim pot 25 turns from the FB to ground it souled work
raibemunn 2,2V souled be fine for DDR3 Mems ;)
Random Murderer I saw you posted a pic of the blue pcb. I have HIS 3870 which uses blue and I have done the pencil mod, but I want to hard mod. Should I just add 100k trimmer to the pencil mod spot here or is there a better place?
http://img402.imageshack.us/img402/3573/img03933aq0.jpg
Here u go.
Ok will do, thanks. I can use the ground to next to the VGPU read pt ya?
This works to?
yes but it is way harder to solder there than the other spot
Which other spot are you referring to?
My card: http://ceemic.pri.ee/hardware/hd3870/hd3870_13_1.jpg
Wanted to solder tomorrow morning. I don't know, if there is any other spot to solder...
Quote:
Originally Posted by Eldonko
Any of the green spots(they are all connected by a trace that i highlighted in green)
http://img.photobucket.com/albums/v6...mg03933aq0.jpg
Random Murderer, do You know any other spot to solder on my Giga's 3870? I have card here right now and DMM too, if it helps...
Very good, thank u sirs, will mod this weekend.
just got out of the shower, i would have posted sooner.Quote:
Originally Posted by ceemic
can you get a high res shot of the pwm area for me?
Cleaned up the pic for other's use. Thanks guys. :clap:
http://img137.imageshack.us/img137/4...3932vx7cx8.jpg
Random Murderer, this is the best, I could take week ago:
http://ceemic.pri.ee/hardware/hd3870/hd3870_13.jpg
your spots are the same.
http://img.photobucket.com/albums/v6.../hd3870_13.jpg
on a side note, if you want to use a different point, grab your dmm and set it to resistance. put one probe on one of those points, and use the other to touch other points and read the resistance. whenever you find a point that has 0Ω resistance, BINGO! you can use that point.
Yes, I already used that method ;)
I find 2 spots also:
http://ceemic.pri.ee/hardware/hd3870/hd3870_13_2.jpg
Thanks:up:
Does this vmod for HIS HD3870 works with HIS HD3850???
Vmod done:cool:
http://ceemic.pri.ee/hardware/hd3870/hd3870mod1.jpg
http://ceemic.pri.ee/hardware/hd3870/hd3870mod2.jpg
http://ceemic.pri.ee/hardware/hd3870/hd3870mod3.jpg
http://ceemic.pri.ee/hardware/hd3870/hd3870mod4.jpg
http://ceemic.pri.ee/hardware/hd3870/hd3870mod5.jpg
http://ceemic.pri.ee/45nm/27667.jpg 1,61V
http://ceemic.pri.ee/45nm/51031.jpg 1,61V
http://ceemic.pri.ee/45nm/80731.jpg 1,64V
Volcano 12 + "open_window_mod" (outside temp +5C):p:
Can somebody show me where i have to pencil for vmem in HIS HD3850 IceQ TurboX???
Sweet!Quote:
Originally Posted by ceemic
1134Mhz on air, Ultra Durable kicks a**!:clap:
Any squeeling sound from inductors at that speed?
Clint, it has been pretty "noisy" card since I bought it. Higher FPS=louder "squeeling":shakes:
nice work:up:Quote:
Originally Posted by ceemic
Thanks. Presumably, with the layout of the card, the best (only?) place to solder the pot is on the right side of that resistor, although I guess I could go hunting to find a spot with 0 ohms to the FB pin?Quote:
Originally Posted by Vatos_locos
correct.Quote:
Originally Posted by Jimbo Mahoney
for the mod here for the 3870 refrence
http://img205.imageshack.us/my.php?i...870pmodsl4.png
is there a better mod, and what one is better as well as what values would be good for 1.45V for gpu vcore
also is there a pencil vdimm mod, im kinda lost and the 3870 and 3850 and reference and not in the same thread are making this hard to follow
Aircooling powwa: http://ceemic.pri.ee/45nm/81153.jpg :cool:
Outside temp -1C; Vgpu=1,76V :ROTF:
At the same clock on 3D2003, it crashed several times during Nature:(
Next stop: 1,80V+DICE:D
Very nice ceemic, 1.8v is alot tho.. :eek:
My HD3870 with 5c cold water dident get over 60c with over 1.9v vgpu
Max temp@3D2006 was 30C, @3D2003 it was 28C:D
i need some info from some of you 3870/3850 owners....
the location in green i need cap info and of the blue ones as well. much appreciated. thanks. :p: :up:
http://www.buydurango.com/josh_files/capsss.jpg
820uF 2.5v all 4 of them.
http://www.octeamdenmark.com/forums/...4&d=1203814250
www.mouser.com have them
as always riska to the rescue!!! :up: thanks allot brother.. :D ;) :up: :yepp:
Thanks. It seems to work, although I need to verify it.Quote:
Originally Posted by Random Murderer
100k pot gives ~1.41 volts. Strangely, the default voltage for my 3850 seems to be 1.32v, the same as a 3870. Anyone else have this?
I've not yet tested clocking, as I b0orked the BIOS of my mobo and am awaiting a replacement BIOS chip.
I am going to attempt the Pencil mod for both vgpu and vdimm however,
I have the antec 900 case with all fan slots going at 120CFM.
Will the huge air flow blow off the pencil shading?
It could do, but just shade it as much as you need and then stick a tiny bit of masking tape over it to protect the pencil mark. :up:Quote:
Originally Posted by slugzkea
Is there OCP mod required for these cards? I did vmod and it works fine but when I raise voltage to say 1.5v I cant run 3dmark even at stock clocks. It goes black screen. 1.4ish volts works fine.
Was cooling with chilled water and temps were below 30C so I doubt that is the issue. Any ideas? Here is the mod:
http://img120.imageshack.us/img120/2322/img04581kb6.jpg
Not normally. People have been running 1.9v without problems.Quote:
Originally Posted by Eldonko
EDIT - hehe actually my Triplex 3850 does have OVP or OCP - I can't go above 1.55v without it shutting down.
Any of you have HIS card that can confirm working vgpu mod without ocp mod? I could do shams ocp mod here but I dont want to do it if unnecessary.
http://img374.imageshack.us/img374/8382/21365711nf6.jpg
1,90V should work fine without OCP. 1,9+V needs at least DICE. I have benched w/ 1,84V w/ Volcano12 in -4C ambient:D (I turned to 1,87V, but lowered "just in case" to 1,84V before benchmarking...)
Lol Im not planning on running 1.9v anytime soon. My problem is something is happening when I inc voltage to 1.5V even. :confused: Black screen the second the 1st test in 3dm06 begins even at stock clocks. Spent like 6 hours troubleshooting last night, and will continue today after work. Mod seems to be working fine, but now that I think of it the one thing I did do before testing was install the new 8.3 CCC. Maybe Ill roll back just to eliminate driver issue as cause.
well feel around the card for hot spots. my mosfets get raggggging hot once i start going over 1.5v. i had to sink em and i still cant touch the heatsinks with my finger. :eek: :D :up: GL
Yeah I was just keeping an eye on the ram temps because I just have a 120mm on it and no sinc but it wasnt too bad. Card makes a hell of alot of noise when its loaded tho lol.
Sorry for the n00b question but I've read in the past that a 2b pencil is what should be used for modding.
However, one of the main successors in this thread has used a 3B pencil.
I have a 2b, a 4b and a 8b pencil.
Which one should i use, should i go out and buy a 3B pencil?
THANKS :D
The softer the pencil the easier to apply.Quote:
Originally Posted by slugzkea
I use 4B, but I guess 8B is even softer due to the higher number.
There is also differences in how the graphite is applied.
Some stroke it with very small pressure, leaving a lot of graphite on there (gaining very low resistance) but also very easy to get blown off and stuck on other places (not good).
Some stroke it with more pressure and have to work harder to get the same low resistance, but it will not get blown away so easily.
In any case you should "seal" it with tape or nail coating to prevent it from get blown off.
As you might see, if using the "low pressure" method you will get a lot washed off when using nail coating.
Nail coating is that stuff women put on top of the red color to make their nails look all shiny and all...:D
I hope this cleared up some.:up:
ok so i just bricked my gecube 3850 by setting vcore to 1.42v :(
it worked ok for a while, but then it started artefacting so I removed the mod, then it started artefacting at stock, and now it even artefacts at 300mhz...
funny thing is though, on one occasion it seemed to work fine at stock clocks after all these problems, even getting through 20 minutes atitool artefact testing and a crysis benchmark at high settings with 4xaa. Leads me to believe it may be reversible damage, but who knows... :S
remember kids, all mods are done at your own risk :D
Quote:
Originally Posted by Eldonko
My probs started right after going to 8.3 as well, could just be coincidence though....
I'll roll back and see if that does anything.
I'm having some problems with my 3870. I was benching 985/2700 with vgpu mod and after a reboot I got no signal on my monitor.
I moved it to the second PCIX slot, plugged in a 6200TC in the first PCIX slot and it was detected in Windows. Gpuz detected the 3870 fine, the only strange issue was that the GPU load was at 99%.
The question is what's the problem? Video card 'almost dead'? :D
Any chance to be fixed somehow?
can i use hot glue to fix the graphite??
Yes but clear tape is eayser
I PM'd Eldonko this but I figured everyone might be interested...Quote:
Originally Posted by Eldonko
About your black screen problem with 1.5v on your HIS card. I've got a GeCube O.C. Edition card which suffers the same problem ONLY when I use a HIS bios.
If I use the GeCube bios, or the Sapphire Bios I can push 1.5v+ quite happily...
Any thoughts anyone? I've tested this quite a bit and it's definitely the HIS bios that prevents 1.5v...
Very interesting, I think switching the BIOS is the only thing I didnt try. I was told that OCP cant be in a BIOS and it clocked well at stock volts so I didnt try any diff ones. Thanks for the heads up on that, will give a try.
Sorry to say but no display with one card when another works fine usually means the card is done. Did you try removing the mod and see if it will give display?Quote:
Originally Posted by Blackoberst
Ok so to serve as a warning to others (story of my life lol) I think my card is permanently damaged.
I pencil shaded my 512mb gecube 3850 from 1.26v to ~1.42v and everything was fine for a couple of weeks until it started artefacting. I removed the mod but it just kept getting worse. Now I can't even boot into Windows without having a 80mm case fan sitting on top of the card. Presumably the voltage regulator had its lunch :(
Works fine now, but can't resell it or RMA it, and I'm hesistant to even overclock it past factory settings (725mhz core). I have a couple of 3870's on the way so maybe I'll just go for gold and see what fun 1.5v gives :D
Yes, I've tried removing the mod, but still no signal.Quote:
Originally Posted by Eldonko
It's strange it died so quickly, no hardmod, only vgpu pencil mod.
Hehe what do you know, I think my 3850 also has OCP /OVP (OVP I think).Quote:
Originally Posted by Jimbo Mahoney
It works fine at 1.5v but as soon as it reaches 1.55v, it drops to 0v and the screen goes black.
My card is a Triplex 3850 512MB using a Nexsem 2415:
http://www.nexsem.com/pdfs/2415DS.pdf
http://www.lenstheory.com/Triplex_3850_VGPU.JPG
The blue circled resistor is connected to pin 8 (OCP) of the 2415. If I remove this resistor, I'm assuming it will remove the OCP? Looking at the section in the PDF, it seems increasing the resistance of this resistor will increase the OCP point, so removing it will do the trick?
EDIT - Removing this resistor did nothing at all. Card is fine :) and OCP still functions :(
Anybody have the pictures for the 3870 OCP mod ?
Found it a bith further up :D
Have you had any luck with this, Eldonko?Quote:
Originally Posted by Eldonko
Put the card back in yesterday to try this and it is just black screen when I boot. :( :shrug:
What is this OCP??
Dead card or bad flash? I've found ATiWinFlash to brick my 3870 several times, had to boot with an x300 and the 3870 in the other PCIE slot and force flash it again...Quote:
Originally Posted by Eldonko
Protection against overvolting. Hence we disable it and overvolt anyway. :cool:Quote:
Originally Posted by victorbr
Dead card. Worked fine last time I ran it but when I put it back in to flash a BIOS it gives no video. :confused: