Hi guys, 
Maybe some overclock guru can help me out with my problem. 
 
I bought another GTX 980. I was getting a good deal on it so bought it.

1- GPU is Gigabyte gtx 980 ti reference Card = GPU1
2- GPU is EVGA gtx 980 ti HYBRID = GPU2

I want to overclock the Gigabyte Gtx980ti card as well as the EVGA HYBRID separately.

Basic reason is that I want to overclock my GPU1 to +240MHZ core and memory to 350MHZ because the GPU 1 can only run stable on those clock speed and at the same ensure that GPU 2 clock matches the GPU1 Clock.
 
Also does the boost clock also need to be the same or not.
 
Thanks 
 

I also have a 980TI SC+ and am thinking of OCing it but did any of you get NOTICEABLE performance gains?