Memory kits compatibility question.

[pvg]

I have the following system:

Model of the motherboard: ASUS P7P55D LE
Model of the memory: F3-12800CL7D-4GBRM
Model of the CPU: i5 750 @3.2GHz cooled by a Noctua NH-U9B SE2

The aforementioned RAM kit as been running flawlessly @1600MHz 9-9-9-24 @1.5V for the past 4 years. Now I would like to add another 4GB to my system.
I would like to know if there is any problem in using this kit (F3-12800CL9D-4GBNQ), since it's rated for the specs I currently use and I could use it's low profile. Are there any known issues, or can I be confident the system will run ok?
Should I just go for another kit like my current one and try and cook something up with my CPU cooler fan placement?

Thanks in advance to any contribution.

[emissary42]

If you want 8GB memory without the usual compatibility questions that come up with mixing different memory kits, then i would would advise you to just get a 2x4GB kit and replace your F3-12800CL7D-4GBRM altogether.

Mixing F3-12800CL7D-4GBRM and F3-12800CL9D-4GBNQ @ DDR3-1600 CL9 might work, but there is no guarantee for it (at least without manual tweaking timings/voltages).

[pvg]

I've considered that solution as well, but I'm trying to go the cheaper way.
Perhaps it's not worth the potential trouble. I'll think about it. Thank you!