Hi all. After some months of achieving my new K8T-Master2-FAR (without socket for 2nd CPU) I have ended up using the ultra-silent Freezer 4 coolers from Arctic Cooling , which are cheap ones (about 22eur in Greece) compared to other silent coolers from Thermaltake that you need to spend the double money in total.
Also, since my motherboard had no CPU adapter in the 2nd CPU position, I had to buy one from a Koolance dealer in my country and 4x3mm screws otherwise you can't install ANY Socket 478 cooler on the 2nd CPU.
Using these coolers, I got temperatures of 50 degrees Celcius using WinXP Pro in idle mode, and about 53 degrees when the CPUs are working 99%.
The "patent" was the following.
Freezer 4s are shipped with fans "looking" inside the case, and not outside, meaning the hot air from the CPU is directed not outside the box. 2 actions needed to be done:
1st. I had to unscrew the 2 basement screws that holding the clips from both the coolers and place the clips upside/down.
2nd. The cooler for the 2nd CPU needed to be moderated, so to not "touching" the circuits side of the VGA card. You will need to trim the fins of the side nearest the VGA card. To do this you will need a paper-cutter or a knife, to make straight lines on each aluminum piece of the cooler and then with the fingertips or needle nose pliers, you move upside/down and is breaks cleanly (remember to not cut the last 4 towards the fan base .

Below is my equipment:

Midi Tower Lian Li V1100 Plus S
Temperatures Monitor Panel 3.5" Lian Li Silver
MSI K8T-Master2-FAR (for dual cpu)
2xAMD Opteron 246 2.0GHz
2xFreezer 4 coolers
MSI FX 5600 XT video card (256mb RAM)
Hercules Prophetview 720 LCD monitor 15"
Western Digital 80GB hard disk SATA1 (8mb cache) for C drive
Maxtor 6 L300S0 300GB hard disk SATA1 (16mb cache) for D drive
Plextor PX-716A DVDR
NEC ND-3540 DVDR
Creative X-Fi Fatality
PSU Thermaltake 600W ultra-silent

I'm using the Speedfan program for monitoring the temperatures of the system. Witht the current system, I'm having the following temperatures (in celcius, room temp.was 22 degrees):
CPU1: 50
CPU2: 52
System: 40
ACPI: 40
Video CPU: 45
Video ram: 26
HD1: 25
HD2: 25

Conclusions:
1.MSI Master2-FAR will use ANY cooler for socket 478 (Pentium 4). U can use large ones if you are using single CPU version and up to 70mm if you want to use dual cpu.
2.I am fully suggesting the Freezer 4 coolers to everyone is using the current motherboard, they are cheap and effective (coolers needs to be moderated first). If we want to over-clock the processors, then Freezer 4 are useless. I am happy with them because they are very silent and effective. And silence is what matters the most in such machines used 24/7 inside our homes.

I got the idea from another user from the same forum about the Freezer 4 coolers, but that guy didn't switched the fans to blow on the outter side of the case, so it's useless, cause using them like they are shipped from the factory, you'll get temperatures of 60-63 degrees celsius.

Any questions are welcome .