New Ok Build for the next year.

[Spanish]

So I recently purchased a few new parts, combined with a few old parts, just so I can have a PC to play on till next summer. My old PC kinda blew up, GPU stopped working, CPU burnt out (Running at 60c Idle)

Below are the specs, I'm hoping this can play maxxed but I've recently come across some problems with it not playing WoW Maxxed (Ultra) in a 25M raid setting (Firelands Heroic) most choppy gameplay is on Heroic Rag. Maybe you can tell me whats wrong?

1 x Acer H213H bmid Black 21.5" 5ms HDMI Full HD 1080P Widescreen 16:9 LCD Monitor
GIGABYTE GA-MA770T-UD3P AM3 AMD 770 ATX AMD Motherboard (Updated Filmware to latest to use with X6 Cores)
Rosewill RP550V2-D-SL 550W ATX12V v2.01 SLI Ready CrossFire Ready Power Supply
Western Digital Caviar Black WD1001FALS 1TB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Dual Channel Kit Desktop Memory Model F3-10666CL8D-4GBHK
PowerColor AX6870 1GBD5-2DH Radeon HD 6870 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card with Eyefinity
AMD Phenom II X6 1090T Black Edition Thuban 3.2GHz Socket AM3 125W Six-Core Desktop Processor (Artic Silver Thermal Compound)
COOLER MASTER Hyper 212 Plus RR-B10-212P-G1 "Heatpipe Direct Contact" Long Life Sleeve 120mm CPU Cooler Compatible Intel Core i5 & Intel Core i7

Only thing O.C is the CPU from 3.2Ghz to 4.1Ghz on AIR, Ilde at 20c, Load at 30-35c.

[Mifuyne]

1: As far as I know, not a single computer unless EXTREMELY OP can run 25 man raiding without lagging(less then 60 fps) on Ultra settings and 100+ addons.
It has nothing to do with the computer.
Blizzard just uses a shit engine when there's alot of movement and effects.

[Deleted]

The only problem i could see would be running out of ram, mabye you should upgrade it to 8GB.