I have a PM MDD G4 which I use as a backup server. The data is extremely important and I need it to be as reliable as possible. The hard drives are Western Digital RE's enterprise. I cannot risk the hard drives failing. I have took it to pieces (ALL of it), cleaned it etc and then rebuilt it. The first thing that is important is the cooling, so I have taken the CD drive out and may be taking the GPU out. I have also re-thermal pasted everything. The hard drives are located underneath where the CD drive would be. I have just bought a new 190CFM delta fan (120mm). I have also got a 3 pin to molex adapter so it will run at full speed, so would the old 120mm fan be good where the CD drive was blowing air into the hard drive caddy? Obviously extra holes would need to be cut, but would this help or make things worse? I know it may sound overkill, but this data is extremely important. This IS critical mission.