I ' ve been using Spigen Ultra Hybrid with no screen protector . I ' ve dropped the phone a couple of times and it ' s there hasn ' t been a single mark on my phone . <| sep |> ChillingCammy immediately died of acute natural causes <| sep |> Willing to die isn ' t the definition of suicidal . <| sep |> Ah . The tale of Iuremius Shield , roommate extraordinaire has finally come to a close ? <| sep |> Do the math . Here ' s an example plug in your own numbers . 200 W load at 80 % efficiency is 250 W . 200 W at 90 % is 222 W . The difference is 28 W . At 10 per kilowatthour , that ' s 0 . 028 KW $ 0 . 10 KWH $ 0 . 0028 hour or $ 25 year . If you keep this hypothetical server turned on for 4 years , that ' s $ 100 more electricity for a bronze power supply than a gold . N . B . , that ' s the difference . The total electricity for the bronze server is $ 875 for four years . And uTheShandyMan ' s point about finding the power supply ' s most efficient operating point is also relevant .