BI4.2 sizing

Hi All,

My Client wants to upgrade from existing BI4.0 to BI4.2 SP5.Client requested to provide recommendations on sizing or any best way we can upgrade or use different options so new version will work smoothely.

We have around 150 users,out of which 10 are expert users,70 are Business users & rest just use it to see report data.We have around 120 report out of which 30 are complex,60 are medium & 30 are small.From this info can anyone guide me below points.

1.RAM/CPU/CORE required

2.Disc Space required

3.DATA IO required

4. In BI4.0,APP server is different than BO server,shall we keep that as it is

5.Any recommendations so new version BI4.2 SP5 will work smoothely