Hey XS.org
I need your help on the soldering points on this card asus 8400gs I have added a picture, could not get a better picture. but hope you can help me.
the chip uses this IC on the card:
APW7068
AJ5CM
/Grau
Printable View
Hey XS.org
I need your help on the soldering points on this card asus 8400gs I have added a picture, could not get a better picture. but hope you can help me.
the chip uses this IC on the card:
APW7068
AJ5CM
/Grau
Got a better picture, alittlebit better.
Any help would be great
/Grau
I reckon pin 4 is feedback (FB) and pin 7 is ground.
Measure ressistance between pin 4 an pin 7, multiply by 20 and put a VR of this value onto pin 4 and pin 7.
For example, if resistance between pin 4 and pin 7 is 500 ohm, multiply this value by 20, 500x20=10.000 so use a 10K VR.
Don't quote me on this as i'm not 100% sure FB actually means feed back but i have a strong feeling it does.
For Voltage reading point, put the card in your system, turn system on and measure at the resistors that are close to the thumbscrew that hold the cooler or at the pins of the caps that poke through the pcb, you should be able to measure Vgpu there somewhere. (do this prior to the Vmod)
Done at your own risk. ;)
Can't really use those pics for anything...
Anyways, the mod is:
Pin 4 of APW7068 to ground via a VR with a maximum resistance of ~20× the measured resistance from pin 4 to ground. Lower resistance to increase voltage.
edit:
Zeus was faster.
edit2:
GOESA,
I bet there's a macro-mode (marked with a flower symbol) in you Powershot A60...
edit3:
What comes to the vGPU measuring point...
These appear to be the legs of a copper coil ->
Attachment 72040
Both of those red spots are good vGPU measuring points.
Thx found the flower :D
Took one without flash and one with, does this help any or just say where to take the picture,
would like to get for the vmem aswell.
/Grau
So can you point out where to mod exactly?
/Grau
Here's a macro from my Canon SX100IS... dont really need it now but whatever helps.. in case we need overcurrent fixed as well I guess ;)
The pin with the dot by it will be pin 1. Go left counter-clockwise to count.. so 4 is the center pin and 7 is far left, all along the "top" of the IC in my picture.
Check that 7 is actually ground before doing the mod though just in case they printed the IC's upside down or something rediculous.
I measured 600 ohms from pin 4 to 7. Gonna see if I can find where I stashed all my VR's...
edit - 10K VR is what you will want to start with.
Are there any other vreg chips on the front of the card? If not, pin 6 - pin 7 could be a point for Vmem.
I can confirm a 10K VR from 4 to 7 is vGPU... running 1.4v now ;)
6-7 doesnt seem to be vmem, took a vr down to 3K on it with no change in vmem, circuit resistance was 780 ohms with no VR in it.
That other IC labeled "74D7KHK / ACT08" might control vmem....
edit - Dont think its the ACT08 IC... hmm.
No thats a quad input AND gate. We need some more photos methinks :DQuote:
Originally Posted by STEvil
The only other IC is an 8-legged one on the front which hides under the heatsink and looks more like a driver IC like what you'd see paired with some mosfets.. i'm too lazy to take the vf700-cu off right now lol (midnight).
edit
We might be looking in the completely wrong spot:
http://dawan.ubergeek.nl/8400GS/Pics/Vmem1.jpg
ok, you win... here's the front IC.
Looks like it could control vmem I guess.
edit
here's another on the back..... need to get a better shot so the text can be read :(
That first one is the bios chip and the second one is a chip related to HDCP output.
It could be something like what the xfx card uses, but they are a pain in the ass to locate because there is a lot of multimeter probing involved :p:
I hope this helps:
Thx guys! really nice,
how about the vmem mod?
/Grau
Hi found something
http://forums.vr-zone.com/showpost.p...0&postcount=17
According to this thread the one that controls the vmem is a chip called 431L which has 3 legs, I found that one on my card, but on the front of the card instead? has this anything to do with the vmem mod?
/Grau
This IC is "1.24V Adjustable Shunt Regulator"
when you look at it so that two legs are on the bottom, left leg is Vref. Decrease resistance between Vref and ground to increase output voltage.
okay but is it for the vmem you think?
/Grau
Well it's definitely not for GPU :D Of all things on vid card that might need a voltage regulator like that, only memory comes to my mind.
thx man only one way to find out now :)
/Grau
I think its 431L, 10k to ground from the leg closest to the wires that go to the VGA connector should do the trick.
I wont be able to test tonight. Will try to do it tomarrow.
EDIT
I went and tested anyways lol.....
Yup, 431L to ground with 10K VR = VMEM mod. Quick test at 2.15v then I gotta run 'cause i'm late now lol
edit
486mhz @ 2.2v so far. 493 caused a crash.
Gotta find a datasheet for the Qiumonda 2.5ns chips..
Good for you STEvil! Damn, then they scale well enough with volts! Yes!
So could you point out where exactly you soldered? the leg closest to the VGA connector, to ground? which one is ground?
/Grau
Just used a ground on the back of the card that holds the backplate bracket thing on.
Edit
added vGPU just so its all finalized.
I made a pic of what you have found out:
http://profide.eu/files/asus8400gs_vmem.jpg
Ground is on the back of the card, where the casing of DVI connector is soldered to the PCB.
EDIT: STEvil you beat me to it :D but my pic is prettier!
Found the datasheet for our ram I think: http://www.qimonda.com/download.jsp?...rev143_www.pdf
How do I get nibitor to read timings?
Edit - Lists 2.3v as maximum relative to Vss (ground, ~0v).... so 2.2 should be fine for benching then crank it up for final run lol ;)
sorry, but I don't really understand exactly where the ground is you used?
iam noob I know :)
/Grau
Go into tools, read bios and choice the 8400gs, then load the bios, go to timings, and then detailed timings, hope you understand :)
/Grau
Use your digital multimeter and make sure those are both grounded, but they should be.. I used the on on right.
EDIT
Data sheet compared to stock timings you showed. I'm not near my bench machine to get its timings but I suspect they are the same... unless thats why yours gets 20mhz better than me at stock lol ;)
Where do you measure vgpu and vmem volts?
/Grau
Top two caps ;)
Thx! you are the man! Gonna get help to do the mod tomorrow I think :)
/Grau
810 core 1900 shader @ 1.5v ;)
2000 shader probably would have gone as well, was being conservative trying to find a stable setting lol ;)
2.2v seems to be the max stable for the qimonda on my 8400.. 475mhz 3D03, 477mhz 3D01. Any more volts and it gets unstable.
A note on Nibitor guys.. I figured out how to work it and there is a "test timings" option so you dont have to flash the bios to play with them.. this is a good thing as I was testing some timings and a lot of the time ended up with screen corruption and etc...
Maybe they dont like more volt because they have the same problem as the 8800 GTīs with the Qxxxxxxxx chips.
Dont even want to try and spell it :p
When giving to much volt Vtt or was it Vddq increases to much.
on 8800 GT they did a mod to lower Vmem and that allowed for around 40-50 Mhz more on Mem.
http://profide.eu/files/asus8400gs_vmem.jpg
Of those three legs on the 431L, which leg takes power from the card in general, which leg sends power to the memory, and what is the third leg doing? Is that maybe a three terminal, third leg as offset, the one alone on a side as incoming power, and the one with the red marked dot to send power to the memory chips?
Should be a supply, ground, and output. I havent looked really close.
I got my card to run the mem at 2.4x volts stable but my solder job fell off so i gotta redo it.
That mosfet to the right of the 431L next to the two caps gets rediculously hot.
The 431 is the drive for the memory power mosfet's, if the mosfet just next to it get's really hot (like... you can't touch it), then please add some extra sinking on your card, otherwise it mights just burn or crack.
Things got hot enough with sustained running at 2.48v to unsolder my wire to the 431L transistor ;)
Auwh, think you can measure actual surface temp of the mosfet via IR or something?
If I could find my IR thermometer yeah.. dunno where it is though.
I'm running into the overcurrent protection at 1.95v and 904mhz+ lol :D
Anyone got an idea on how to disable/increase it?
Pin 13 to ? should be overcurrent: http://pdf1.alldatasheet.co.kr/datas...C/APW7068.html
There is a resistor between the OCSET pin and ground. Measure it, remove it and solder in a resistor with ~2-3 times more resistance. (I cant see the pictures in the pdf but going by the description that should be right :D )
Looks like its the "44B" resistor (hard to read it).
http://www.xtremesystems.org/forums/...75&postcount=7
An SMD capacitor across the SMR should increase OCP as well correct?
Confirmed.
Remove the 44B resistor and OCP is done for ;)
Reached 1000/2500 desktop @ 2.3v ati tray tool artifact tester. Couldnt bench over 905/2430 due to heat though.
Ran up to 2.5v testing, nothing over 2.05 gave me any benchable gains on my water setup.
Question ? Are you guys using rivatuner to overclock ? because I use rivatuner to overclock my eVGA 8400GS and it will only allow me to oc to 702 Max ? is it the drivers or rivatuner ? How do you guys get it higher than 702 ?
Sorry for the noobie question. Any help appreciated.
chispy.
You need a volt mod to go above 700 usually.
Quote:
Originally Posted by STEvil
Thank You for the response , the card its volt moded already but all i can get it to its to 702/512. The core its holding me back or the drivers or rivatuner ??? dont know why but in rivatuner the max allow overclclock on the core that shows its 702 turning the slider all the way tru the right side to the end. Any help or guidance as to why its this will be appreciated.
chispy.
You will need to increase what rivatuner allows at the maximum clock in the power user section... cant remember exactly what it is off the top of my head.
Thank you STEvil for your help , ill try messing around with rivatuner. appreciate your response.
chispy.
In the Power User tab go to Riva Tuner \ Overclocking \ Global and edit the value for "MaxClockLimit" to 150 or 200 or something... higher the value the higher your overclocking limit.
anyone can help me ?
http://www.xtremesystems.org/forums/...d.php?t=208032
Hi! have a MSI Geforce 8400gs which i would like to voltmod. It has the APW7067 IC. Will this mod also work for my card(the PCB is different)?
^ Not too likely. Start a new thread with pics an stuff an I'm sure theres plenty of folk who can help ya ;)
I bought an EVGA 8400GS a few days ago and I want to volt mod it. The IC layout is a little bit different than the Asus 8400GS. Here are some high res pictures of the PCB. Can someone help me find out if a pencil mod is possible with this card? Thanks in advance.
Whole card
http://bayimg.com/image/cafbaaacc.jpg
Top left
http://bayimg.com/image/cafbdaacc.jpg
Top right
http://bayimg.com/image/cafbgaacc.jpg
I was kinda bumbed after I found out my card is the crippled G98 8 shader version instead of the decent G86 16 shader version. I hate Nvidia for these schemes.
I got help on another forum on the pencil mod. I shaded the resistor from 770ohms down to 560 ohms. After the mod the blue leg reads 1.390v. Right now I'm running at 910 core, 2125 shaders, 400 mem. (This is with a modded old CPU cooler) Haven't messed with the mem yet. But I don't think I'll do the vmem mod, since the mem chips don't have a heatsink on them.
http://bayimg.com/image/pafnoaacj.jpg
Do this at your own risk.
Question, my resistor is in the same spot as STEvil but is has a different number (it's not 44B), is this a problem or can I remove it to have OCP removed?Quote:
Originally Posted by STEvil
Edit:
Ok here's a pic of mine, as you can see my chip is not marked as 44b like on Stevil's card, it's marked as 53b. They are exactly the same card can I remove that chip to do the OCP mod?
http://img11.imageshack.us/img11/1696/img0320ub.th.jpg
^^^Bump added picture.
:up:
you could also pencil it down
guys, how do i reduce vGPU or is this offtopic :)
Do i put VR in place of orange resistor?
http://www.xtremesystems.org/forums/...1&d=1202573572