Simple, effective, low profile.
I bought 2 Corsair Vengeance lpx low profile 32 GB (2x 16 GB).
These were easy to install on my motherboard. My cooling system takes up a lot of space, but with the Low Profile, I had no trouble fitting them. But 4 slots are now complete and everything is working perfectly, and I have an extra 32 GB to run my software such as Photoshop.
Fast and careful delivery, like my previous LDLC purchases. I recommend Corsair products as well as LDLC.