Radeon 9800 mod

[BaRtMoN]

Hi! I have an interesting Radeon 9800 from GeCube with 256MB of RAM.

It has Hynix 3.3 ns TS0P RAM chips and an R360 GPU. It presents itself as a 9800 XT because of that GPU. Photos of the bare card:
- gecube-r9800-front (http://freeweb.siol.net/jaba26/FORUMS/XtremeSys/gecube-r9800-front-bare.jpg)
- gecube-r9800-back (http://freeweb.siol.net/jaba26/FORUMS/XtremeSys/gecube-r9800-back-bare.jpg)

After some detective work I found two chips which handle voltages:
- Semtech SC 1175 CSW for Vgpu (datasheet (http://pdf1.alldatasheet.com/datasheet-pdf/view/42501/SEMTECH/SC1175CSW/datasheet.pdf), actual pic (http://freeweb.siol.net/jaba26/FORUMS/XtremeSys/gecube-r9800-back-sc1175csw.jpg), stock voltages (http://freeweb.siol.net/jaba26/FORUMS/XtremeSys/sc1175csw.png), vmod (http://www.extremeoverclocking.com/articles/guides/R9700_Vmod_1.html))
- Anpec APW 7037 A for Vmem (datasheet (http://www.anpec.com.tw/products/download/pdf/APW7037a6.pdf), actual pic (http://freeweb.siol.net/jaba26/FORUMS/XtremeSys/gecube-r9800-back-apw7037a.jpg), stock voltages (http://freeweb.siol.net/jaba26/FORUMS/XtremeSys/apw7037a.png), vmod (http://www.xtremesystems.org/forums/showpost.php?p=1047935&postcount=21))

I assume which voltage each chip regulates because of my capacitor measurements (http://freeweb.siol.net/jaba26/FORUMS/XtremeSys/gecube-r9800-voltages.jpg) on the card itself. It also seems pretty standard for SC1175CSW to supply gpu voltage on other Radeon cards. I also assume that Vgpu = 1.7 V and Vmem=2.65 V on my card (yellow in the photo).

If I've done my research right, I should do the following:
- Vgpu: 20kOhm or 10kOhm pot between pin 18 of SC1175CSW and ground (preferably on the mobo/case)
- Vmem: 10kOhm pot between pin 1 of APW7037A and ground


I just need confirmation if this is correct... thanks a bunch!

[KODE]

*Just noticed your PCB has a completely diff layout... :(

Here's how I did mine:

9800Pro (R360-256MB) flashed to 9800XT.

http://www.xtremesystems.org/forums/showthread.php?t=35924

Good Luck.

[KODE]

Pic i used to perform my vgpu mod:

[BaRtMoN]

I wonder how you find those soldering spots on the SMD elements? Like instead of soldering directly on the chip pins you solder to some SMD element. Do you trace the wire from the pin to it or what?

[KODE]

This time I just followed this guide, but yes you can trace it too.

[BaRtMoN]

Can someone please confirm my findings?!