I'm currently 5 instancing on a 2 yr old computer. Things run pretty smooth but I have to avoid Shatt and the Isle or it will lock up. I upgraded from 2 gb to 4 gb of RAM thinking I'd be able to grind SSO rep and use the portals in Shatt, however after replacing the RAM sticks I start getting progressively worse fps. The maxfps is set to 40 on the main and it is usually at that with 2 gb but with the new 4 gb it starts at 35 and gets worse the longer I play no matter what I'm doing. While doing the 2 SSO quests in Hellfire I saw my average fps drop noticeably.

I thought putting new RAM in was as easy as it got for hardware upgrades but apparently I can screw that up. I did put the old RAM back in though and it's working good again. Any one have any theories for what might be going on?