Putting over 100tdp gpu especially 2080 that’s over 150watt plus other components like cpu etc will melt the Blade, and 230 watt ac adapter won’t supply it well. It’ll probably eat battery capacity, discharge it and will shut down on gaming even plugged on the wall. This is mobile rtx gpu and desktop version comparison. I believe non MQ/ maxq, would need really big ac adapter especially on 2080, it’ll against Blade 15 portability purpose. But on Pro 17 model if there’s any refresh, it may be possible to put full 2080 (mobile).