HiFi Simulations suggests the following to help with freezing of FSX:

AFFINITYMASK Setting and Freezes

Use an appropriate AFFINITYMASK setting within your FSX.cfg configuration file. This
setting specifies which cores are used for FSX. Using too many cores, or improper cores
can cause freezes. If you are using 6 or more cores, it is important to limit the cores used,
as too many cores causes synchronization problems and more potential freezes. We
recommend using 3 cores maximum, regardless of HT enabled or not.
 

Has anyone experienced freezing and used these suggestions?  If so, what was the effect on freezing?

Please, please do not use the Affinity Mask tweak.  Freezes are mostly caused by high settings.  In FSX there is no tweak to overcome high settings other than lowering them.  In 2006, most members here were lucky to get 15 fps and the settings were all very, very low.  Now, today, we have powerful computers and most can get good results with FPS locked at 30 (and no tweaks).  I think that is the best tweak of them all.

4 hours ago, twister1853 said:

Has anyone experienced freezing and used these suggestions?  If so, what was the effect on freezing?

An Affinity Mask (and more) helped me with the freezing problem.  Back in the day when running FSX with HT enabled on various Core i7 CPU's I finally settled on an AM of 212, and as well a Command Line notation in the Active Sky shortcut (the more I mentioned previously) that forced it to run on the first and second logical processors (Core0 and Core1 in geekspeak).  This configuration kept AS and FSX from ever sharing any cores/LP's... which from thereon eliminated the freezes for me.

HTH,

Greg

Thanks Jim: I've been warned !

Greg: wow, that's beyond me, but thanks for the reply.