After reading the question, I suggest you don't do any Vmod yourself

sorry Shah81...saya budak baru belajar ini Vmod

hi...newbie here a.k.a noob...... wat is mod? and wat is modding?

mod = modding (verb)
the word "mod" comes from "modify" or "modification"
modding means u modify ur hardwares to let it do more than it can by default or to add/unlock some features and etc...etc

noobs at volt modding shud be careful, u must first consider that the card ur about to mod is to be thrown away so that if anything goes bad, u wont cry ur eyes out, ikut mcm shah, rosak jer beli baru, rosak lagi beli baru, tak nangis pong, betui tak

Kau la hero ku! But too noobs, master ur soldering skills first, seriously thats the best advice from sumone who fried his expensive GC once way back when i was young young young and the forum has less than 2000 members.

i still dun understand..is it like clocking??

read the 1st page then u'll get the idea

i dun seem to get any info on the 1st page...on the 1st page they already started to talk about modding

theyre just terms used to shorten a longer word dude...

mod=modify
modding=modifying

as for the meaning....a dictionary will help.... just look for the word modify or modifying

basically means changing something from its original form to gain improvements.

Still got people in here......I thought this thread is lost

Dengar tu sume....ikut ckp ijan
Hehehe....mmg tak nangis tapi sedih la jugak.

hi, i don't know this is the right section to post but i'll ask it anyway. is it safe to solder both the psu's 20 pin connector together? what abt the molex? i'm planning to solder 2 psu together but i need advise on safety and practicality. so any experts can give any opinions?

No it is not safe since no 2 psu have the same voltage level. If you want to turn on both psu together, only connect the PS-ON which is the green wire from the 20-pin connector together.
For practicality, you might want to make that connection removable. Use some sort of connector, don't solder directly together so it will be easy to remove the second psu when needed.

Hmm, shah, just curious, what are those ICs that you solder the VRs to? Have a old P4 478 mobo which I suspects has a undervolting problem (according to BIOS/speedfan, no option to adjust voltages). Going to check with my DMM, if it really is undervolting would like to know how to vmod the thing back to stock. As it is it seems to be having some trouble running faster processors than 1.6GHz.

Oh, btw what are the typical Vcore and Vmem of the 9550 series? Was trying to find the voltage of my card, but not sure reading is which. Mine is a Xpertvision 9550V+, 450 core 350 mem OC@525/410 (no vmod), wondering if its factory modded-cos it gives similar benches as a 9600XT.

the colorful 9550 in the first page was mine...its exactly the same as ur 9550v+ only difference would be the cooler. colorful got heatpipe cooler

if i remember correctly.. according to the spreadsheet the MAX voltage of the rams was around 2.3 IINM. and at stock its running at 2.2 can only increase 0.1v. not too sure coz when i sent my card to shah we found out that the rams voltage can only increase very little.

i forgot the voltage for the core though.

This post has been edited by mADmAN: Nov 3 2006, 12:21 PM

Those ICs are the voltage regulators. Undervolting maybe caused by underpowered PSU. Check your PSU voltage rails under full-load condiion first and make sure everything is ok.

For 9550, the Vcore is normally around 1.3V and the Vmem depends on the type of the ram chip used. For DDR it's around 2.5V and DDR2 1.9-2.0V depending on the ICs used and their spec. Some manufacturer over-volt their 9550 to get better overclockability or they already OC it by default.

For example, my 9550GT have 1.32V for Vcore while the vanilla 9550 usually have its Vcore at 1.25-1.27V. 9550GT runs at 400MHz while vanilla 9550 runs at 250MHz.

thanks for the reply shah. i'm using your proposed technique actually my plan was to make use of 2 cheap psu to deliver a higher power capability, but it seems what you've explain is true. so i shall cont to use the proposed method. thanks a million for the advise

Thanks shah & madman,

So the ICs read the output voltage and adjust the pulse width of the power mosfets if the voltage varies? or does it use another method? I understand from my university physics and electronics basics you're just modding it into a voltage divider using a VR to present it a false reading to make it go higher rite?

Abt the undervolting board, I'll give it a shot with my CM realpower 550W, if its not the voltage regulators then I'll ask again. Don't think it the PSU though its cap ayam, voltage on DMM is not as pretty as true power PSU but still ok. Only way is if the PSU is presenting a input resistance, which I doubt. Btw, I don't have a digicam, can I just give you the markings of the ICs?

There are one person modding the 8500 GT, but I just can't find the link///

Maybe someonrcan help me?

bro try to add some damper circuit(filter) on your supply line.
a ferrit core and some filtering tools for the supply and source line
will help alot.
anyway, TDA2004 with 15WX2 RMS right?
a good VR for the main valume control will be an added advantage for great crystal clear output.

* i had my STK dual channel amps collecting dust. it was my final year project on Polytech sin year2000.
haha

shah81... ur mods are extraordinary! now i know what to do with all the old gc/mobo's i have for sale in lyn since no one wants to buy it