But:
I have 2 times 16GB ordered in 2 times 8 GB modules. The Mac started up without difficulty. But I advise everyone Selbstaufrüster URGENT memtest to install and in single user mode to test the acquired modules. Memtest all showed a defective module.
The same result I had with Corsair Mac Memory.
That is not on my Mac demonstrated by the fact that (together 32GB) completed properly a 1-day Memtest the current configuration with a pair of Crucial and a pair of Kingston.
So: Just tuck and power-up is far from all that is OK.