FPS Stutter Lag In Metro 2033, Help Isolate the Issue?

[xemath]

My system specs are as followed:

Windows 8.1 Home

Intel I5-2500k Overclocked at 4.3GHz, with the Hyper EVO cooler, default Voltage and no crashes since

Crucial Ballistix Sport 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory -- Haven't tested RAM too see if I have a bad stick, but should I?

Gigabyte G1 Gaming GTX 970 Factory OC

Seagate Barracuda ST2000DM001 2TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive --- The drive runs at 100% alot, not sure why, I tried the superfetch fixes and it still spikes even with that. Don't know if this can cause stutter.

Now, I know my card can handle this game with the current settings:
1366x768 (The Monitor I use wont let me go to 1080 for whatever reason, its originally a 720p HDTV.)
Quality: Very High
SSAA: Off
Texture Filtering: AF16x
Motion Blur: On
Vertical Sync: Tried on and off

Now I also have the Intel GPU enabled to support a third monitor via HDMI, could that be the problem? I have disabled it but havent tested yet, should I just hook all three to the card GPU?

Thanks for any input.

 

[xemath]

turn on "triple buffering" and "adaptive" for vertical sync in the NVidia control panel.

Should I do adaptive or half refresh adaptive? and what does Triple Buffering do exactly? I've seen it on multiple places said to be turned off, but not exactly sure of what it does. Will test and get back.