Memory clock multiple times

#1

I do not have any timings in the OC window, but I have several different cards in the rig.
I want to only change timing for a few cards in the stak.

GPU0 = no change
GPU1 = change to 1700
GPU2 = no change
GPU3 = change to 1700
GPU4 = change to 1700
GPU5 = change to 1700
GPU6 = change to 1700

How do I reprsent no change in the stream or syntax of the numbers.?

#2

Set 0 (zero) - it’s says to do not change