The Aurora R10 PSU is standard ATX format . . . which is 150mm wide, 86mm tall, and the length will vary. The length of the OEM PSU is 140mm, and I suggest you replace with the same length or cable management will become an issue. Consider a fully modular PSU so the cables you do not need can stay in the box. The graphics card can be up to 274mm long and 124mm wide to install without chassis modifications. The nVidia RTX 3070 Founders Edition will fit without any modifications. The nVidia RTX 3080 Founders Edition will fit if the front fan is replaced with a 15mm fan. For the CPU upgrade, if you do not already have the AIO liquid cooling . . . you should consider adding that for your new processor.
Hi All, I need a little bit of advice. I wish to upgrade my Ryzen 5 ro a Ryzen 7 and upgrade the GPU and power supply. In terms of the power supply, can i buy say a Corsair one, for example (see link) would this be ok? Does Dell sell power supplies, as ordinarily, I'd like to just buy the required upgrades part from Dell. However, I don't see any place for that option on their website. Not to worry And secondly, the Ryzen 7 cpu, I assume I can just buy one of those from Amazon.  But the GPU, the Alienware case seems kinda smaller than most, so I am assuming I need a "smaller" GPU card? Any advice would be great and thanks for taking the time to read my post, Hope you are all well out there and take care.  
Aurora R10, upgrade of CPU, GPU, and power supply