problem of memory ram Galaxy s5 ROM Alexander BOB7 (CSC XEU) topic

Hello,
I just flash the ROM BOB7. (CSC XEF)
Operating properly.
I have a problem with RAM memory:
Ram the galaxy S5 ext 2GB
Under kikat displayed ram is 1.98 GB
Under Lollipop Alexandr BOB7 displayed ram is 1. 66 GB.
Is this normal?
I made a bad manipulation?
Thank you for your help.
Good day.