ShadiElwan,
It's your processor so you can choose what you want to do, but if it was me, I would NOT be satisfied with a chip running in 90C-100C on stock settings even with a stock cooler. When Intel says that the recommended heat for this processor is 74C, that SHOULD (and that's a BIG should) mean that your processor should run at a max of 68C-78C at stock settings with their stock cooler; at least that's what it should mean from a marketing/advertising standpoint. If you're running 90Cs with stock cooler, that means with aftermarket cooler, you could see into 70C-80C range depending on the cooler you get, meaning if you decide to overclock the processor, you could be back up into the 90C-100C range again! That brings back the same point of why buy an unlocked processor if you cannot safely overclock it? Why not pay 40 bucks less and get the 4790 instead?
With the new RMA chip I received, at stock speeds I got temperatures in mid 60Cs with high of 71C with stock cooler and with Corsair H60 I got low to mid 50Cs with high of 62. Correct me if I'm wrong, but this is the correct temperatures that the processor should run, not 90C-100C on stock settings with stock cooler.
Hope it works out for you one way or the other.