Very low FPS, High CPU load on GTX 780 ti after mobo / cpu upgrade.

I recently upgraded my motherboard, CPU and CPU cooler and migrated to Windows 7 Pro (64-bit) from Home. After these actions, the framerates on the system have dropped by 50 to 75%. Simple tasks like playing videos online have horrible lag times. Overclocking the CPU (using reference numbers from this and other forums) has no affect on graphics performance, but does reduce CPU loading (restored to default). I am a noob regarding BIOS / OC / GPU interfacing, and have done everything I know how to do (e.g., BIOS and driver updates, removing excess programs and overhead).

No change in power supply (Corsair TX850W)

My "Before" and "After"...

Previous Build:
Windows 7 Home(fully updated)
Gigabyte GA-X79-UD3 Motherboard (BIOS fully updated, default settings)
Intel i7-3820 CPU
16 Gb DDR3 RAM (G.Skills Ripjaws – 4x4Gb)
nVidia Geforce GTX 780 ti (Driver Version: 368.69)
Performance:
“Overwatch” 70 fps, full HD
CPU loading ~60%

New Build:
Windows 7 Pro (fully updated)
Asus x99-a/USB 3.1 (BIOS fully updated, default settings)
Intel i7 – 5820k
16 Gb DDR4 RAM (Kingston HyperX Fury – 2x8Gb)
nVidia Geforce GTX 780 ti (Driver Version: 368.81)
Performance:
“Overwatch” 20-30 fps, full HD
CPU loading ~90%

I'm completely stumped and very frustrated.
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More about low fps high cpu load gtx 780 mobo cpu upgrade
  1. Many hours later, we found out the PCI-E bus was NOT operating at 8x. Returned the mobo and got a new one, and everything is rainbows, unicorns and koala bears.
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