Can a OLAP Cube be Processed in to RAM , Can this be done using Traditional BI ? , If we can place the entire SSAS Cube in RAM for better performance , how can it be done?

I'm on the mission to increase the performance of my OLAP Cube and i thought placing the CUbe entirely in RAM can solve this problem. can anyone please answer me , if this can be done using Traditional BI i.e SSAS and how?