Sparkle 8800gt Voltmod - no reference design?!

[blind_ripper]

hi guy's
im in deep sh** and some off u can help me!!
i desoldert these 2 smd's and i dont know the value's if some one can messeure these out for me ?
http://i3.photobucket.com/albums/y90...tb/8800smd.png
these are the 2 smd's , need help guy's !!!

[micheskillz]

hi guy's
im in deep sh** and some off u can help me!!
i desoldert these 2 smd's and i dont know the value's if some one can messeure these out for me ?
http://i3.photobucket.com/albums/y90...tb/8800smd.png
these are the 2 smd's , need help guy's !!!

I'd be glad to help you out on that, but AFAIK you have to desolder them before meassuring, and i'd rather not desolder any of them :/

[blind_ripper]

can any one get me a read-out ?

[micheskillz]

Btw does anyone know if these Hynix chips is good or not? the memory chips.
It's:

Hynix KOR
HY5RS123235B
FP-1 752A
VTFF480903

And it seems to be Hynix 1ns chips. But does anyone else know anything more about them?


EDIT: Found out that these chips are specified at 1000Mhz and are high-voltage chips. So therefor my vmem is high (2.05v), but they're specified at 2.2v @ 1000Mhz. And mine does 1050 @ 2.05v with ease.

[labs23]

@micheskillz

is this the specific model of your card? SF-PX88GT512D3-HP

[metallus84]

hi guys i have a big problem. I have a non reference board v1.2 sparkle as the one in this topic, but i cannot overvolt the gpu core. I soldered one 50 kohm vr as described above to the ST L6713A and ground, soldering pin as described before but whei i try to increase voltage, it drops to 0.000 volt after it reaches 1.108. During test i tryed to bypass the OVP protecition of ST L6713A but without success. Is there a known workaround?? what i can do??

Tnx a lot

[HitandRun]

hi guys i have a big problem. I have a non reference board v1.2 sparkle as the one in this topic, but i cannot overvolt the gpu core. I soldered one 50 kohm vr as described above to the ST L6713A and ground, soldering pin as described before but whei i try to increase voltage, it drops to 0.000 volt after it reaches 1.108. During test i tryed to bypass the OVP protecition of ST L6713A but without success. Is there a known workaround?? what i can do??

Tnx a lot

Post a picture of the volt mode! Maybe you did a mistake! Let us take a look on it!

[metallus84]

ok i will post as i make pics

[metallus84]

ok i made pics, i hope are detalied enough, i made only vmod for gpu core not mem








original size pics are here, 2 mb each (copy and paste to browser because direct link not works)

http://death84.altervista.org/img/1.JPG

http://death84.altervista.org/img/2.JPG

[largon]

metallus84,
Your problem is the "ground" point - I mean it's not actually ground. That point is directly connected to a leg of a vGPU inductor meaning the solder point is at live vGPU voltage.

[loonym]

My search skills suck apparently. I need help to mod this card.

http://lakesidepc.com/100_3967.JPG
http://lakesidepc.com/100_3973.JPG
http://lakesidepc.com/100_3976.JPG
http://lakesidepc.com/100_3977.JPG
Thanks for any help.

[loonym]

My search skills suck apparently. I need help to mod this card.

http://lakesidepc.com/100_3967.JPG
http://lakesidepc.com/100_3973.JPG
http://lakesidepc.com/100_3976.JPG
http://lakesidepc.com/100_3977.JPG
Thanks for any help.

No one?

[celemine1Gig]

TBH, your pics are not very helpful. I can't read a single chip name. If you can give us the names of the voltage regulators, then we can help.

[loonym]

I'm not sure. Is this them?

[celemine1Gig]

If I find the time, I'll mark all the interesting chips. RT9259A doesn't look bad, though.

http://tw.richtek.com/download.jsp?t...RTOTI1OUEtMDJD

Could be Vmem. I don't think that it's responsible for VGPU.

[loonym]

Thanks, I truly appreciate any help and I can make better photos.

[celemine1Gig]

The 2 chips marked in red could be interesting:



And please take a pic of the card's frontside, too. Perhaps the VGPU controller is mounted there. All the chips that I have seen so far don't seem like the typical VGPU controller. Far too simple, IMHO. I have a feeling that there's one on the frontside of the PCB.

BTW, I would guess that the IC marked in red, on the left (the one with 8 pins) is the EEPROM, but I could be wrong.

[loonym]

Sorry my cam is not better. I see nothing typical about this when I look at it beside my 8800s.

http://lakesidepc.com/100_4008.JPG
http://lakesidepc.com/100_4028.JPG
http://lakesidepc.com/100_4016.JPG
http://lakesidepc.com/100_4017.JPG
http://lakesidepc.com/100_4015.JPG

[celemine1Gig]

One tip for the future: If you want to take a photo of an IC, with the markings readable, then you have to use flash and take the shot from an angle. If that combination doesn't do the trick, for example because the markings are barely visibly at all, then rubbing some white thermal compound on the markings, most likely helps.

Looking through the pics right now. The two chips that I had marked in red, are an EEPROM and a Quad-NAND, so nothing interesting in terms of vmodding. Looking through the rest of the pics now.

Edit: OK, seen all pics, but the only real controller chip remains the RT9259A. Seems strange. Not even an OPAMP there.
BTW; is there a chance that there is a chip under that huge white label sticker?

[loonym]

I peeled that, just some smd under there.

[celemine1Gig]

I really though that the RT9259A would control Vmem, but without another controller, it nearly has to control VGPU. Will have another thorough look at all your pics this weekend. Perhaps I missed something.

What you could do anyway, is to measure voltages on the RT9259A.

Of interest are voltage and resistance between the following pins:

- #4(FB) and #7(GND)
- #6(FBL) and #7(GND)

[loonym]

Resistance 4 to gnd=.626
6 to gnd=.785
voltages for 4 and 6 are .792 and .789 respectively.

[largon]

I believe that "AP-AB" pictured in post #64 is vGPU ctrlrl, the look-alike chip above that, the fet driver.
RT9259 would be just vMEM.

[celemine1Gig]

I believe that "AP-AB" pictured in post #64 is vGPU ctrlrl, the look-alike chip above that, the fet driver.
RT9259 would be just vMEM.

That would make sense, but unfortunately I couldn't find any info on it. Have you successfully found anything?

[largon]

I've seen a few of these mysteriously marked (eg. AP-AA, AP-AG, and now AP-BA ) 16pin QFN buck chips with very inconsistent pinouts. Some have FB pin in pin16, some pin14, some pin8...