Originally Posted by PuntyMario
a good idea would be to get a small 80 mm fan and stick it on the south side of the vrm heat sink and with that blowing air you should be able to keep it chugging along. ive got a phenom x6 oced to 3.4 ghz and all is good so far
There is always a chance of death of 790FX GD70 with an overclocked 125watt X6 CPU even it is rev1.1 board because it has only 4 phase too. Let me tell you some important things related to 790FX gd70's Phase/VRM/MOSFETS as I have blown up three GD70. One of them was 890FXA GD70. Each phase can provide absolute maximum theoretical current of 40 Ampere (Mosfet name is = RENESAS R2J20406, you can search and download pdf). Maximum temp limit is 90c. It means 4 phase x 40 ampere = 160Ampere (max). Max value has never been safe for real world operations because at this peak point extreme heat occurs (close to 90c) which is very hard to cool. Remember as MOSFET temperature increases, the current carrying capacity of each phase reduces as well.
Now All Phenom II 125 watt CPU require 110 ampere current at factory clock (According to 'AMD's Power and Thermal data sheet', you can search and download pdf). This current requirement can easily be provided (At factory Clocks) from 4 phases because each phase will have to deliver only close to 28A, Which is safe for motherboard. But as you overclock CPU with increased voltage, current requirement of cpu also increases. It makes VRM to become more hot as current requirement of CPU goes close to maximum support of VRM.Edited by sumitlian - 3/12/12 at 12:59pm