GMP Posted September 18, 2022 Share Posted September 18, 2022 Since I'm now running a GTX 1070 in my M18xR2, I decided what to do with the empty secondary GPU slot. I decided not to use it for a MXM to NVMe Adapter, since I think a normal SSD gives all the speed I need. What I did decide was to use the secondary GPU slot for extra cooling for the CPU. I'm gonna use the secondary GPU heatsink and fan, and solder some heatpipes from the triple piple CPU heatsink to the secondary GPU heatsink. That will allow me to keep the 3940XM even cooler and push it even more. I checked and it can certainly be done. I can easily add an extra 3 heatpipes. When it's done, I will post some pictures. I ordered some low temperature solder (melts at 138°C), that's low enough to keep the heatpipes from bursting/exploding while soldering. The second option is a thermal conductive epoxy, but I'm having trouble finding a good one with good thermal conductivity, can be cured at room temperature and has a glass transition temperature that is high enough (this is the temperature at which the epoxy starts to become liquid again). That being said, that is not my problem. The thing is I prefer not to make any custom plate that fits in the secondary GPU slot on which I can mount the GPU heat sink. I have an old AMD GPU from before that fits and which is perfect to mount the 100W AMD heatsink on. My question is, will this interfere with the GTX 1070. Will I have boot problems with the 2 different GPU's? Or is there a way to completely disable the secondary GPU slot from the unlocked bios so that the AMD card doesn't get detected and powered? That way it can act like a dummy plate on which I can mount the heatsink. I checked but can't really see an option that fits disabling it in bios, unless I'm missing it. Or can I just boot in windows and disable the AMD GPU from there in the hardware? Does that mean the GPU won't be powered in that case as soon as windows loads the next time? Not really sure what the best option is here. Of course I don't want any heat originating from that dummy GPU. If someone has any experience with this... Thanks! 1 Link to comment Share on other sites More sharing options...
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