Not sure the R2 has UEFI class 2.3.1 bios so it may not work. [URL] Latest Bios may help [URL]  
Hello everyone, I want to confirm if RTX 3080 or 3070 can work on my Area-51 R2 (Intel core i7 6800k, 16GB ram) . Power is 1500w from close inspection the slots are ok 16 and a by 4. Thank you Start by reading through these threads =Area-51 R2, feasible to install the new Nvidia RTX 3080?Area-51 R2, RTX 3090/3080 compatible?Dell-Admin
Area-51 R2, RTX 3080/3070, compatible?