Is this a good gaming build?

Communities Gaming
1

GIGABYTE GA-990FXA-UD3 AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard

HIS IceQ H787Q2G2M Radeon HD 7870 GHz Edition 2GB 256-bit GDDR5 PCI Express 3.0 x16 HDCP Ready

NZXT HALE82-N NP-1BN-0650A-US 650W ATX 12V 2.3 and EPS 12V 2.92 SLI Ready CrossFire Ready 80 PLUS

ADATA XPG Gaming Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model AX3U1600GC4G9-2G

AMD Phenom II X4 965 Black Edition Deneb 3.4GHz Socket AM3 125W Quad-Core Processor

will the 1600 mhz ram be enough or should i get ram with around 1800 mhz? i dont want to cause bottlenecking 

2

Rm speed makes no difference

get a 7870LE instead of a standard 7870, the LE has 15-20% better performance

i would get a different 990FX board besides gigabyte

and a FX-6300 instead of a Phenom II 965

you dont need a 650W PSU either, a 550W PSU is more than enough