Usually a pretty good price difference between the basic CM 690 and LIAN LI PC-7F. Not as big a difference between the Nvidia RC 690 with the side window. LIAN LI PC-7F is made of aluminum, RC690 of steel. Aluminum cam make for better cooling than steel. But the RC690 has more optional fan install points. PC-7F has slightly better cable management options to hide your system cables. All-in-all they're close enough that you can pick the one you like best, or the least expensive, both are good choices for a high performance gaming case.