Hey! I realize this post is a few days old but if you haven't already found answers to your questions, I can try to answer them. 1)  The answer to this is "probably". The G5 is available with a 3070 option that runs on the 500W power supply (which you should have with the i7). It is worth noting that OEM graphics cards are made for Dell and are customized by Dell to draw less power than a comparable retail card. I would try to find info online where someone else has tried a retail 3070. For reference, retail 3070s are rated at 220 watts, and the 3060 Ti is rated at 200 watts. Nvidia recommends a 650W and 600W power supply, respectively, for these cards. 2) Dell secure boot must be disabled to allow you to run a retail card (as far as I am aware). This is an option in the BIOS. The problem is that it is enabled by default, so you need the original card to boot the system if your BIOS is reset (either by the user or if your CMOS battery dies). Otherwise, if secure boot is enabled, an aftermarket/retail card will likely not let the system boot. 3) The LED lighting can be disabled inside of Alienware Control Center (AWCC). 4) The clear door is just there for the interior LED lighting. The side panel doesn't contribute anything to the strength of the chassis so there's nothing to worry about. Just don't put anything heavy on the plastic glass portion if you are using your computer on its side.  Sorry I can't help you more re: the first question. I don't see why they won't work properly but a lot of that is dependent on how over engineered the OEM power supply is. Dell will never give the green light to use a non-Dell part, but my plan for my G5 is to find a 3060 Ti when they're actually available (mine came with a regular 2060 and while it's fine, I'd love to actually be able to use ray tracing in games at more than 30FPS). It would be interesting to know how much harder the PSU is actually working to run it.
Hi Folks, I just purchased a brand new Dell G5 Gaming Desktop and had a few questions that I was hoping someone could help me with. Here are my specs: My questions: Thanks in advance for any information! Much appreciated! - jg1234  
G5 Series Gaming System - few questions