I'd like some advise what to do! (upgrade what?)

[Deleted]

Hello, lately i have been having some problems with wow. I got screen tearing all of the sudden, but i guess i can cover that with vsyns and 3x buffering, but i also got weird hickups in the game. Even on low graphics my characters, and other characters still move a bit like robots. I know this should be fixable, but i literally tried everything..

So i would like to ask, what do you guys think i should upgrade?

What i got now is (sorry for the long list of text):

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Model : GigaByte
Chassis : GigaByte Desktop
Mainboard : GigaByte F2A75M-HD2
BIOS : AMI (OEM) F2 10/12/2012
Total Memory : 8GB DIMM DDR3

Processors
Processor : AMD A10-5800K APU with Radeon(tm) HD Graphics (2M 4T 4.19GHz, 3GHz IMC, 2x 2MB L2)
Socket/Slot : FM2 (PGA904)

Chipset
Memory Controller : AMD F15 (Trinity) APU HT Hub 200MHz, 2x 4GB DIMM DDR3 1.33GHz 128-bit

Memory Module(s)
Memory Module : Corsair CMV4GX3M1A1333C9 4GB DIMM DDR3 PC3-10700U DDR3-1334 (9-9-9-24 5-34-10-5)
Memory Module : Corsair CMV4GX3M1A1333C9 4GB DIMM DDR3 PC3-10700U DDR3-1334 (9-9-9-24 5-34-10-5)

Video System
Monitor/Panel : Hewlett Packard HP w2228h
(1920x1200, 22.3")
Video Adapter : AMD Radeon HD 7800 Series (16CU 1024SP SM5.0 860MHz, 1GB DDR5 4.8GHz 256-bit, PCIe 3.00 x16)

Graphics Processor
OpenCL GP Processor : AMD Radeon HD 7800 Series (1024SP 16C 860MHz, 1GB DDR5 4.8GHz 256-bit)
Compute Shader Processor : AMD Radeon HD 7800 Series (1024SP 16C 860MHz, 1GB DDR5 4.8GHz 256-bit)

Storage Devices
WDC WD10EZEX-00RKKA0 (1TB, SATA600, 3.5", 7200rpm) : 932GB (C (D
HL-DT-ST DVDRAM GH24NS95 (SATA150, DVD+-RW, CD-RW) : N/A (E

Logical Storage Devices
Data (D : 536GB (NTFS) @ WDC WD10EZEX-00RKKA0 (1TB, SATA600, 3.5", 7200rpm)
Hard Disk (C : 395GB (NTFS) @ WDC WD10EZEX-00RKKA0 (1TB, SATA600, 3.5", 7200rpm)
Optical Drive (E : N/A @ HL-DT-ST DVDRAM GH24NS95 (SATA150, DVD+-RW, CD-RW)

Peripherals
LPC Hub Controller 1 : AMD Hudson LPC Bridge
LPC Legacy Controller 1 : T2 87-28
Audio Device : Gigabyte Hudson Azalia Controller
Audio Codec : Realtek Semi High Definition Audio
Audio Device : PC Partner Cape Verde/Pitcairn HDMI Audio [Radeon HD 7700/7800 Series]
Audio Codec : ATI (AMD) HDMI Audio
Serial Port(s) : 1
Disk Controller : Gigabyte Hudson SATA Controller [AHCI mode]
Disk Controller : Gigabyte Hudson IDE Controller
USB Controller 1 : Gigabyte Hudson USB XHCI Controller
USB Controller 2 : Gigabyte Hudson USB XHCI Controller
USB Controller 3 : Gigabyte Hudson USB OHCI Controller
USB Controller 4 : Gigabyte Hudson USB EHCI Controller
USB Controller 5 : Gigabyte Hudson USB OHCI Controller
USB Controller 6 : Gigabyte Hudson USB EHCI Controller
USB Controller 7 : Gigabyte Hudson USB OHCI Controller
SMBus/i2c Controller 1 : ATI SB800 SMBus

Printers and Faxes
Printer : Microsoft XPS Document Writer v4 (600x600, Colour)
Fax : Microsoft Shared Fax Driver (200x200)

Network Services
Network Adapter : Realtek PCIe GBE Family Controller (Ethernet, 1Gbps)

Operating System
Windows System : Microsoft Windows 8 Professional 6.02.9200
Platform Compliance : x64

Windows Experience Index
Current System : 5.9

[Deleted]

HRm...is it possible that the PC is trying to XFire the APU and the GPU?