Jimbo597 said:
The CPU temp runs about 45c to 50c with any game.
Run Asus Probe for a heavy session of Sims 2 and measure this game in particular. Find out what it's peak temp achieved is (not just CPU but also ENV).
The problem occur with single and SLi.
Hrmm.. guess that rules out the NV profile.. great.
You said (problem on that series motherboard, but easy to fix) what problem and how do I fix.
It's not too uncommon for the heatsink/heatpipe on the NORTHBRIDGE to be loose or otherwise poor contact with the chip itself, especially given the heatpipe/tube that attaches to it and connects over the CPU.
Here's a pic to better illustrate:
http://img.neoseeker.com/v_image.php?articleid=1993&image=28
As you can see, the Northbridge cooler has a copper heatpipe that also stretches above the cpu to cool above. Sometimes, that copper tubing is a bit "bent" causing the lower part to not fit properly on the Northbridge (i.e. minimal contact).
Also, it's a passive cooler which means it requires airflow over those fins to provide any amount of cooling. If you have your drive cables, memory or power cables and/or insufficient case fans to draw/exhaust air in a "flow"- you can have these issues only when overly taxing cpu/memory (alah Sims 2).
Does your case have plenty of fans? Do they form an airflow (i.e. orientation of intake fans/one side, exhaust fans/opposite side)? Have you inspected the black stand-offs on the motherboard? Removing the assembly and putting better compound (i.e. Arctic Silver 5)/re-affixing sound like something you're capable of?
Overall, I doubt the problem is related to the 7600's in general (barring defective hardware on one/both of them). Sims 2 really doesn't need too much graphics muscle- just a decently modern card.