![]() You're only running two dimms, and they should be 'installing' (LoadOpt) at the stock JEDEC 1.8 - shouldn't be enough to run the bridge very hot, but your symptoms are exactly what happens when overclocking/overvolting a bridge (say, 4 DIMMs 2.1V and 1066) - runs OK 'till you 'push it'. It is held in place by a pair of 'spread-pins' that snap through the board, and underneath the top 'heads' of the pins should be a couple little springs - try to get a look at 'em (dental mirror might help.) and see if either one looks damaged, and whether the sink itself is 'down' squarely on the bridge itself. Try having a look at this: your northbridge sink is the big one, right next to your CPU. Rotation feedback also monitored via pin 3 only for BIOS alarm purpose." No controlled rotation at all from the mobo. SYS_FAN1 and PWR_FAN are three pin socket with fixed full speed fan. Feedback is sent to pin 3 for BIOS alarm purposes. This time, the mobo senses the North Bridge (in your case the P43) temperature and will increase or decrease the speed of the fan connected in this socket. So, if using a four wire fan, its internal PWM is locked to full speed (this explain that fixed 5v on pin 4). SYS_FAN2 connector needs any fan, with three or four wires (don't care) since the speed is controlled via on-board PWM controller that supply pulse-width-modulated 12v for the fan via pin 2. Fan's rotation feedback returns via pin 3 for BIOS alarm feature. The mobo senses the CPU temperature and managing the pin 4 signal, the cooler's fan will automatically be increased or decreased, following the CPU temp. "CPU_FAN connector needs a CPU cooler with four wires were the PWM modulator is included in the cooler.
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