I must say in all my PC, tower/desktop, computer builds, over the years, since 1995, I have never attempted to to risk over-clocking my central processors or graphics cards.
Whenever I found them unsatisfactory for the latest game, etc, software I was using, I merely replaced the motherboard and/or, processor, and/or graphics card, with a later/better/faster type, and leave them as standard...and still under guarantee!
If I find my Motor-bike is too slow for me...I buy a faster Motor-bike!
Paul...Honda CB 500 RR Twin....Meep-meep!... 8-)...!
My present Tower specification suits my FS 2004 admirably...
...to run FSX at the same settings, and smoothness, would require a complete computer re-build!...

...!
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.