Hi, I recently replaced both my CPU and mobo, upgrading to an i7 950 and an ASUS sabertooth x58 mobo. For about a day I've been running fine, but recently I started experiencing lag, and when I checked the CPU temp in the BIOS, it read 84 Degrees celsius. Upon restarting, I got a CPU over temp error notice before going into the bios. I was wondering What the best course of action would be. I am using the stock fan which is installed correctly.
Also, if you've overclocked you CPU, I'd really recommend upgrading your cooler. The stock one simply isn't good enough. For the top of the line cooler, you could go with a Noctua NH-D14 or the Corsair H70.
You can also take a look here to find reviews of CPU coolers : http://www.frostytech.com/top5heatsinks.cfm