NZXT Launches E Series Remember when NZXT was just a case and cooler company? Pepperidge Farm remembers. The company has upped their game in some incredible ways. First they introduced a motherboard, and now they have PSUs. Okay, they’ve had PSUs, but these ones are special. The E Series gives builders a choice between a 500W, 650W and 850W model. All three are rated with an 80 PLUS Gold efficiency, which quite frankly is more than enough for normal use. You might think NZXT is just jumping on a bandwagon, but that’s seriously not the case here.