|Your specs are incomplete. I assume you have a Q9550? But there's no motherboard model given, you definitely don't have a 7500W PSU & I have no idea what an "ATI Shaper" is?|
There's absolutely no reason to upgrade the CPU, but being that you have DDR3-1600 RAM, you should reclock the one you have to 1600MHz FSB so that both the CPU & RAM run in sync. In fact, you *should* have no problem running it at 3.0GHz @ 7.5 x 400MHz, if you're willing to overclock.
But before doing anything, check your CPU temp to make sure it's in the normal range....then test you RAM with memtest86. Bad RAM or improperly configured RAM settings are often the cause of blue screens.