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uPI datasheets? XFX 7870 with uP1608 controller

post #1 of 4
Thread Starter 
Hi, I would like to do a vGPU mod on my XFX 7870 (non-reference). Problem is I can't seem to find any info on the buck controller. Might be a quite common chip popped in a uPI package.
post #2 of 4
Sadly those things are proprietary, and there are no datasheets available.

Your best bet is pick an oscilloscope and start analyzing what happens in the pins.
   
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post #3 of 4
Can you post high-res images of the controller and the resistors grouped immediately around it? A VID mod should be fairly easy to figure out.

Check this post over at HWBOT to see what I mean:

http://forum.hwbot.org/showpost.php?p=244720&postcount=2
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post #4 of 4
Thread Starter 
Thanks guys. Some pics are attached. The RT8867 from Richtek seems to share some similarities with the 1608 but I guess it's a shot in the dark.

Meanwhile, I managed to do a BIOS vmod using a hex editor, I can post details later. That is a sufficient solution for me, even though a hard mod would be the best.

P1608_xfx7870_core_1.jpg 642k .jpg file
P1608_xfx7870_core_2.jpg 635k .jpg file
P1608_xfx7870_core_3.jpg 680k .jpg file



Unrelated, I also managed to blow a cap in the fan PWM circuit by running a different cooler with ATX -12v connected to fan's ground and the other three wires connected to the XFX board for fan control (stupid). I have an old, dead Asus P35K laying around that I can use for parts. Do you think the SM cap (marked in red) is the only blown component? Here's a picture of that part:

blown_cap_pwm_xfx7870_core.jpg 564k .jpg file
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