correct ram for motherboard?

[Kamikazi]

i have a qustion on my motherboard and the ram
so i have the MSI Z87-G45 Gaming LGA 1150 Intel Z87 HDMI SATA 6Gb/s USB 3.0 ATX Pro Gaming with Killer Networking & Sound Blaster Intel ...
and ram: G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900) Desktop Memory Model F3-14900CL9D-8GBXL
well someone on newegg who is a mod told me that i should get 2 ram stick because this is a one, but it comes with 2X 4GB ram, so is my combo right now correct and optimised?
also, i have a i5 4760k cpu should i get a new fan for it or is the stock one good enough, currently im buying the Rosewill RCX-Z300 92mm Ball CPU Cooler for 15 bucks
thanks

 

[Dark Lord of Tech]

G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900) Desktop Memory Model F3-14900CL9D-8GBXL < Good choice

The Rosewill cooler you mentioned is garbage.

 

[Kamikazi]

G.SKILL Ripjaws X Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900) Desktop Memory Model F3-14900CL9D-8GBXL < Good choice

The Rosewill cooler you mentioned is garbage.

sorry to bother you but, should i buy a new cooler or is the stock one good enough? it will be mainly a gaming pc around 1300 dollars

 

[Dark Lord of Tech]

The stock is fine unless your going to overclock.