Palit 7300GT GDDR3 (Sonic) vGPU?

[Calmatory]

So I have got the Sonic model of Palit's GeForce 7300 GT, with GDDR3 and clocks of 500/1000(ddr). However, the problem is that I can only reach ~560(max, after the delta mod) stable for the core, and I am eager to get more.

Yes, I know that there are several older threads, several threads and articles around the internet, but I've never seen the same PCB design/layout in other threads/articles. I could've put this into the old Palit/Xpertvision thread, but the chances that someone would look at it are laughable, thus I apologize for the new thread and I hope mods understand me. :)

So, the pics?

Front side (http://img142.imageshack.us/my.php?image=gf73000021ao7.jpg)
Back side (http://img142.imageshack.us/my.php?image=gf73000121ni9.jpg)

Oh and Infineon 2ns (http://img208.imageshack.us/my.php?image=gf73000131qa4.jpg), max w/o artifacts @ 850MHz. :toast:

Feel free to ask for macros, about the chips, resistances and voltages.

[largon]

Macro pic of this area would help.

83082

[Calmatory]

This? (http://img297.imageshack.us/my.php?image=gf73000191gj9.jpg)

[largon]

Perfect.
Now, what are the resistances between "a" and "b", and "a" and "c"?
"b" and "c" are pin #6s of those APW7065s.
Also, measure resistance between ground and "b" and ground and "c" .

83083

[Calmatory]

AC is 484 ohms and AB is 338 ohms.

I couldn't get a reading between ground and B or C. :|

Edit, :ROTF: you meant resistance between pin3(ground) and pin6, right? Going to measure it. I feel embarrased. :D

Edit more: ground C is 486 ohms and ground B is 323 ohms.

[largon]

83128
http://www.xtremesystems.org/forums/attachment.php?attachmentid=83128&stc=1&d=1218014940

Measuring points are...
83129

Have fun.
:)

[Calmatory]

Great! Thanks a bunch! :) :worship:

[largon]

Once you finish poking it with searing metal&solder don't forget to report the results.
:)

[Calmatory]

Sure, will take few days to receive components I ordered. ;)

Any chance for a pencil mod, so I could do some nifty testing during weekend? :D Also there is a strange issue, my DMM shows that the vGPU is 1.2V and that vMEM is 2.05V, even though the defaults should be 1.16V and 1.98V. Guess my(cheap, 19€) DMM is tricking on me. :(

[largon]

You're going to have to find where the trace from pin#6 goes (on the other side of the PCB) in order to device a pencil mod. You need to find a resistor located between the trace and a ground plane and pencil the resistor.

I'd say your voltage measurements are accurate. 19€ DMM measures such voltages just as accurately as a 499€ Fluke.
:)

[Calmatory]

So the resistor I'd pencil is between pin6 trace and ground, and by penciling(or with VR) I lower it's resistance and thus buff the voltage?

Will try that in few hours, reporting back ofc. :)

[largon]

Yup.
That's how it goes.
The trail of graphite from a pencil creates a high-resistance "resistor" over the actual resistor thus the combined resistance of them becomes lower.

[Fr3ak]

Your card looks different from my old Sonic 7300 GT cards. With watercooling, I was able to bench them in SLI at 1000/1000 MHz =)

[Calmatory]

Your card looks different from my old Sonic 7300 GT cards.

Hence this thread. :D In the another thread there was talk about penciling R37, which apparently seems to be the very same resistor to pencil with this PCB layout also. When I measured the R37 resistance, I got 484 ohms. I penciled it to ~430 ohms, thus the vGPU should be around 1.29(assuming that the vGPU is 1.16V @ 484 resistance.). However, overclocking hasn't changed at all, plus right now when I measure the vGPU from the pin Largon showed, I get 1.163V, instead of 1.2V what I got before from the same pin. Will need to remove the penciling and measure vGPU, then apply it again and then measure the vGPU again to see if it really is like this.

Maybe I just made a slight mistake, dunno. At least the card still works. :ROTF:
Edit, I penciled the wrong res. The one next to R37 was the right one. Atm running @ 1.3V and at least 625 stable. :) Guess this saved me from soldering work aswell, possibly.

[NormanABates]

Your card looks different from my old Sonic 7300 GT cards. With watercooling, I was able to bench them in SLI at 1000/1000 MHz =)

Fr3ak, did you pencil or soldered to get that score? If penciled, can you post a pic where to pencil it? Thanks a bunch.

I have the old Palit 7300gt too on my son's pc and planning to get more out of it. Thanks in advance.