Krazyq - did you run 3Dmark (05?) (not 06?)... and did you runn it at the programs Default settings (witch is 1024x resolution).
if you ran 05 with 3Dmarks Default settings, then yea someting is wrong.... i asked you to run 3Dmark, only cause its a different program then FEAR, so this way i can tell if its Just FEAR or your entire machine with a prob.
you should have roughly ~6000 3Dmark05 score, and FEAR shouldnt pause at all unless you reach a Save Checkpoint.
Only setting for me in FEAR witch causes Excesive Lag is (VolumetricLighting| witch i turned OFF)
(and 1600x Resolution in large areas)
also make shur you have Vsync disabled, for testing purposes.
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your ingame pausing and lagg, sounds like you still may have a driver issue...
download
http://www.cpuid.com/cpuz.php
CPU-Z and run it, and see if it tells you your motherboard/make and model/ ....that way you may beable to update the Motherboard Chipset driver manually from the Chipset Manufactuere website.
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EDIT: o yea, EVGA brand is a good one... its possible the prob could be a defective Graphics card, or Powersupply. so this is what you wont to do:
rule out software/drivers first...
wait for your new Powersupply...
and then blame the GFX card only after you rulled out all the other components as above.