FPS dropping months after building

Hey folks.
I built this system a few months ago, and the last couple of days I've noticed my FPS has dropped quite a bit. WoW went from 75-80 FPS down to 60-70. It's a small drop, but it's making me mad that I can't figure out what did it. The only thing that's changed is adding a second monitor. Could that cause that big of a drop? It's the same brand as my other one. The primary is hooked up to DVI and the secondary is on the HDMI.

System specs below. None of the drivers are out of date according to SlimDrivers. The GPU temp sits at 60-65c with one game running and a couple of browser tabs open. I'm still fairly new to hardware issues, so any help would be lovely.

SiSoftware Sandra

Computer
Model : GigaByte H87-D3H
Serial Number : To be fille***********
Chassis : GigaByte Desktop
Mainboard : GigaByte H87-D3H-CF
Serial Number : To be fille***********
BIOS : AMI (OEM) F5 08/03/2013
Intel vPro : 9.00.03.1347
Total Memory : 7.88GB DIMM DDR3

Processors
Processor : Intel(R) Core(TM) i5-4670K CPU @ 3.40GHz (4C 3.79GHz, 3.8GHz IMC, 4x 256kB L2, 6MB L3)
Socket/Slot : FC LGA1150

Chipset
Memory Controller : Gigabyte Core (Haswell) DRAM Controller 100MHz, 2x 4GB DIMM DDR3 1.33GHz 128-bit, Integrated Graphics

Memory Module(s)
Memory Module : Corsair CMZ8GX3M2A1600C9 4GB DIMM DDR3 PC3-12800U DDR3-1600 (9-9-9-25 4-33-10-5)
Memory Module : Corsair CMZ8GX3M2A1600C9 4GB DIMM DDR3 PC3-12800U DDR3-1600 (9-9-9-25 4-33-10-5)

Video System
Monitor/Panel : ViewSonic VX2370 SERIES (1920x1080, 23.0")
Monitor/Panel : ViewSonic VX2370 SERIES (1920x1080, 23.0")
Video Adapter : AMD Radeon HD 7900 Series (28CU 1792SP SM5.0 1GHz/850MHz 17% OC, 3GB DDR5 5GHz 384-bit, PCIe 3.00 x16)
Video Adapter : AMD Radeon HD 7900 Series (28CU 1792SP SM5.0 1GHz/850MHz 17% OC, 3GB DDR5 5GHz 384-bit, PCIe 3.00 x16)

Graphics Processor
OpenCL GP Processor : AMD Radeon HD 7900 Series (1792SP 28C 1GHz/850MHz 17% OC, 3GB DDR5 5GHz 384-bit)
Compute Shader Processor : AMD Radeon HD 7900 Series (1792SP 28C 1GHz/850MHz 17% OC, 3GB DDR5 5GHz 384-bit)
Compute Shader Processor : Intel(R) HD Graphics 4600 (160SP 20C 600MHz/1.2GHz, 64MB DDR3 1.33GHz 128-bit, Integrated Graphics)

Storage Devices
Samsung SSD 840 PRO Series (128GB, SATA600, SSD) : 119GB (C
WDC WD10EZEX-60ZF5A0 (1TB, SATA600, 3.5", 7200rpm) : 932GB (F
WDC WD3200AAKS-00B3A0 (320.1GB, USB2/SATA300, 3.5", 7200rpm, 16MB Cache) : 298GB (G
ATAPI iHAS124 W (SATA150, DVD+-RW, CD-RW) : N/A (D
DTSOFT BDROM () : N/A (E

Logical Storage Devices
System Reserved : 350MB (NTFS)
BACKUPS (G : 298GB (FAT32) @ WDC WD3200AAKS-00B3A0 (320.1GB, USB2/SATA300, 3.5", 7200rpm, 16MB Cache)
Hard Disk (C : 119GB (NTFS) @ Samsung SSD 840 PRO Series (128GB, SATA600, SSD)
DATA (F : 932GB (NTFS) @ 2x WDC WD10EZEX-60ZF5A0 (1TB, RAID/SATA600, 3.5", 7200rpm)
Optical Drive (D : N/A @ ATAPI iHAS124 W (SATA150, DVD+-RW, CD-RW)
Optical Drive (E : N/A @ DTSOFT BDROM ()

Peripherals
LPC Hub Controller 1 : Gigabyte Lynx Point LPC Controller
LPC Legacy Controller 1 : ITE IT8728F
Audio Device : Intel Core (Haswell) HD Audio Controller
Audio Codec : Intel 2807
Audio Device : Gigabyte Lynx Point HD Audio Controller
Serial Port(s) : 2
Disk Controller : Gigabyte Lynx Point 6-Port SATA AHCI Controller
USB Controller 1 : Gigabyte Lynx Point USB xHCI Host Controller
USB Controller 2 : Gigabyte Lynx Point USB Enhanced Host Controller #2
USB Controller 3 : Gigabyte Lynx Point USB Enhanced Host Controller #1
SMBus/i2c Controller 1 : Intel ICH SMBus

Printers and Faxes
Printer : HP LaserJet 400 M401 PCL 6 (600x600, Colour)
Printer : Microsoft XPS Document Writer v4 (600x600, Colour)
Printer : Foxit Reader PDF Printer Driver (600x600, Colour)
Fax : Microsoft Shared Fax Driver (200x200)

Peripherals
Media Player : WD 3200AAK External (298GB)
Media Player : Apple iPhone (14.77GB)

Network Services
Network Adapter : Intel(R) Ethernet Connection I217-V (Ethernet, 1Gbps)

Operating System
Windows System : Microsoft Windows 8.1 Professional 6.03.9600
Platform Compliance : x64