As I already stated earlier, ANY PWM Freezer made for the Abit AB9 QuadGT/Abit IN9-32X Max will fit the IX38 QuadGT.
There are models available from www.mips-computer.de and www.watercool.de
Unfortunately, there is no NB block available as of yet, but Mips is working on it - will be finished soon

About the 1,25 strap, I'm running it now with 4G D9GMH@1000 4-4-4-12.
Seems stable, 1000 5-5-5-15 is definitely stable (3-4 days BOINC + Games)
Bios 12.B05