In the last six months I have replaced many of its guts including
CPU: Upgraded from an I5-750 to an I7-875k
The power supply to feed the new video cards. More power wasn't required. More wires were.
Two each: from nvidia GTS450 to GTX660ti. They are not SLIed.
Next up is a SATA III SSD. That it is bigger matters less than that it is faster. It is replacing an Intel SATA II SSD.
I will be off line for part of the day tomorrow reloading the operating system and applications.
MB said memorably once that clearing his cache when renouncing formal moderation would make the GOS new again.