If it handled your i7 860, it will handle an i5 4670k just fine. I would venture to say an i5 Haswell would run cooler than an i7 Lynnfield. BTW, what are you doing with that old i7 anyway?
The i7 is already sold to a friend i will upgrade next week...my current pc now is
cpu fan:coolermaster v8
ram:8gb corsair vengeance 1600
gpu:gigabyte 660 oc edition
case:coolermaster cm 690II
psu:coolermaster 850 silent pro
ssd:intel postville x-25m 80 gb for OS
hhd:2 caviar black 640 sata II on raid 0
sound:soundblaster x-fi titanium fatality
I will move to 4670k and gigabyte z87xud4h.
The old i7 + old mobo and some spare kit of corsair dominator4 gb 1600 will be sold to a friend for a 180 euro.