How to benchmark SQL Server performance after hardware replacement?

We are going to upgrade server with new hardware. And i'm kinda curious about how is SQL Server performance will improve. I'm not a DBA and know just a little about performance monitoring. My only idea is creating some heavy queries, run it before hardware replacement, run it after hardwaer replacement, compare execution time. Yeah i know that idea doen't even sounds good but it's all what i have. Is there any way to benchmark performance in more common and efficient way?