My E5345's showed up today nice clean matching pair of low voltage processors. Spent the requisite 30 or so minutes installing them and I'm quite impressed. My 5355's were ES's so that will have some effect on the power and heat but: Idle temps for 5355's was 38 idle temps for the 5345's 26. Load temps for the 5355's 48 load temps for the 5345's 34. Geekbench 5355's 10,470 Geekbench for the 5345's 9246. Idle front fan speed for the 5355's 748, Idle front fans speed for the 5345's 521. I'm glad I spent that $30..