Will a R9 390 Nitro fit in my Phantom 410?

Solution
In its default configuration, the NZXT Phantom 410 supports video cards up to 12” (305 mm) long. If you install the optional 120 mm fan on the hard drive cage, this clearance is reduced to 11” (280 mm), but it is increased to 16.5” (420 mm) if the upper hard drive cage is removed from the case.
NZXT.COM

R9 390 Nitro is 308mm in length so will fit if you use the highlighted scenario above , your card fits easily.

Dark Lord of Tech

Retired Moderator
In its default configuration, the NZXT Phantom 410 supports video cards up to 12” (305 mm) long. If you install the optional 120 mm fan on the hard drive cage, this clearance is reduced to 11” (280 mm), but it is increased to 16.5” (420 mm) if the upper hard drive cage is removed from the case.
NZXT.COM

R9 390 Nitro is 308mm in length so will fit if you use the highlighted scenario above , your card fits easily.
 
Solution