Is my i7 CPU running too hot?

"worry not, 43c isn't anywhere NEAR hot.

here's a thermal guide for the Core i7 920 (Source: Tom's Hardware)

-Tcase / Tjunction-

--65-- / --70--70--70--70-- Hot

--60-- / --65--65--65--65-- Warm

--55-- / --60--60--60--60--Safe <--

--25-- / --30--30--30--30-- Cool"

Temperature is ok. No worries!