I installed Redhat 8 burning onto disk using downloaded ISO images. I am not sure the requirements of Redhat 8, but I do know the requirements of 7.3(should be around the same).
CPU:
text mode- 200MHz Pentium class or better
graphical- 400MHz Pentium II or better
HDD:
min- 650MB
Rec- 2.5GB
full install- 4.5GB
MEM:
min text mode- 32MB
min graphical- 128MB
Rec graphical- 192MB
CPU:
text mode- 200MHz Pentium class or better
graphical- 400MHz Pentium II or better
HDD:
min- 650MB
Rec- 2.5GB
full install- 4.5GB
MEM:
min text mode- 32MB
min graphical- 128MB
Rec graphical- 192MB