I noticed that my first person shooters haven't been performing as they should anymore. Most noticeably my Source Games and Battlefield 2/2142 are unplayable. Their frame rates have dropped significantly to the point where I'm only getting 5-6fps.
For some odd reason, Guild Wars performs flawlessly. I hate that game by the way! Normal PC tasks are fine. Video Playback is fine. Just my FPS games. I play Counter-Strike: Source, Battlefield 2, and Battlefield 2142. Each of these games are now unplayable.
They worked fine up until I added a secondary hard drive for extra storage. Maybe my power supply is giving out? I don't see how my normal PC functions can go fine, but not games. Also Sims 2 has received a minimal but noticeable performance hit as well.
Anything else? I dunno... I may try and unplug that new hard drive, maybe it's sucking too much power out of the PSU and it's not supplying the video card with enough juice.
Oh, BTW, I do have a dual monitor setup as well. Previously, before the addition of the new hard drive and secondary monitor, games have been performing fine. I did disconnect the 2nd monitor and reinstalled the display drivers only to experience the same performance issues with the single monitor attached so I put the 2nd one back in since it makes no difference with/without it.