Well certainly your temps would be a lot better..
But keep in mind, these graphics cards blow so much air through them that you need to take a can of compressed air to them every 8 months or so to make sure the fan and the heatsink doesn't get clogged with dust.. The more air you push, the more dust that will get into your hardware, the more dust you get into the hardware, the hotter it will run since the heatsink will have less contact area, the hotter it runs the faster the fan will spin to compensate and the more air it will push.. Very quickly spirals out of control if you don't keep up the maintenance.
Onboard RAID vs. 3Ware RAIDI never recommend people run RAID-5 with onboard chipsets.