[PLUG] modifying repairing GPU PCB

[King Beowulf]

Hello PLUGgers,

Not really a Linux/Unix question, but since some of you have experience 
in the electronics biz, maybe you have some ideas.

I have a GPU with a blower style heat sink and fan (single fan, Cu block)

Zotac Gaming Geforce RTX 3090

Since the blower is a bit loud (it was a data center GPU once upon a 
time), after some research I found the "desktop" version of the fan / 
heat sink - a standard Al heat pipe with 3 fans, as is used for most 
gaming GPU.  This heat sing/triple fan does fit, but I need to make a 
slight modification.

Blower type cards typically have the 2 power connectors on the end of 
the PCB J5010, J5011 - as this one does - and I just need to move the 
connectors to the top PCB edge J1 and J2 locations so that the heat sink 
/fan and shroud will line up and fit.

Since my old Weller WP25 soldering iron tops out at 250C, and is showing 
it age a bit (bought it ? decades ago), I splurged on a

Hakko FX888DX-010BY - Digital Soldering Station

50-480C
65W ceramic heater
chisel, 1.6 mm tip

Now, most of my fiddling involves Sn/Pb, Sn/Ag/[Cu,Bi,Se] solders at 
250-350C, and the Hakko wand has no problems liquefying these.  However, 
I am not able to melt to remove the solder from the GPU PCB connectors, 
even at a setting of 400-480C.

Does anyone have any ideas or information on the solder used on GPU PCBs 
and components?

-Ed