Alex: I am going to install 5.3.3 so I can proceed. Can you answer the following two questions?: 1) If I install 5.3.3 on HiPer ARC & 3.5.12 on HiPer DSP and later want to step down to the lower versions, is there any problem? 2) Do you know which documentation covers various settings in detail for these cards? Thanks. You are always very helpful. Kirt