New computer HDD & SSD questions...

[Dfn]

I'm putting together a new pc this week and I had two questions.

1) Will I need to wipe a hard drive if I'm moving it from one computer to another? It was on a i7 920 on an evga 1366 board. New computer is an i5 2500k on an asus 1155 z68 board.

Will any problems arise from the OS being installed while using a different setup? Or can I just hook it up and go? It will have the same video card, if it matters.

2) In a few weeks I'll be adding a 120gb SSD to hold the OS and a few applications, everything else will be stored on the HDD. At that time will I need to wipe the HDD? Or can I just install the OS on the SSD and choose to boot from the SSD without clearing the HDD? I've never used multiple internal drives before.

Thanks