My casing is closed, if open casing wise the temperature might drop a few more C. Honestly I felt I need a change for the case, Tsunami Dream really doesn't offer me good enough air-flow anymore.

Initially during the earlier trial, my system passes the following setting for 30 mins prime without error at stock VCore.

1) 320MHz x 9 = 2880MHz
2) 360MHz x 8 = 2880MHz
3) 400MHz x 7 = 2800MHz

Then when I go for 400MHz x 8 = 3200MHz, the rig able to bootup but experiencing reboot when I started to prime. Then I add the VCore (VID Special Add) step by step:

1) +12.5mV : failed after prime for 5 minutes
2) +25.0mV : rebooted after prime for 2 hours
3) +37.5mV : successfully prime for 6 hours and 5 minutes

Note: mfcm guided me all the way through this for trial OCing (thanks a lot )

Final temperature reading I recorded after priming for 6 hours:

Highest processor core: 67C, 60C, 67C, 59C
Chipset: 57C
PWM: 51C

I don't think I'll do anything that stress the CPU for more than 3 hours continuous... so my rig can consider stable now and proceed with ram timings tuning?