Power Supply Assistance For Windows Home Server

I am currently building a Windows Home Server. I have used Antec's power supply calculator and Neweggs Power Supply Calculator and both are drastically different. New Eggs Is Much Higer. I think 380 watt power supply will do but wanted to the communities feedback. Here is my current set-up.

Motherboard: GIGABYTE GA-EG45M-UD2H LGA 775 Intel G45 HDMI Micro ATX Intel Motherboard
CPU: Intel Pentium E5200 Wolfdale 2.5GHz LGA 775 65W Dual-Core Processor
RAM: CORSAIR 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel
Case: ANTEC Mini P180 - 1 220 nm fan and one 120nm fan. No USB. eventually will use eSata Port.
DVD-RW - SAMSUNG 22X DVD±R DVD Burner with LightScribe Black IDE
HDD- One 1.5TB WD Green Drives & two 1TB WD Green Drives.

I have currently selected the following PSU: Antec earthwatts EA380 380W Continuous Power ATX12V v2.0 80 PLUS Certified Active PFC Power Supply

Should I be okay or should I get a 450w Power Supply?
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  1. That PSU is plenty for that build and Antec's have good quality PSU's. Is that PSU coming with the case? Otherwise you could get a Corsair 400W for more peace of mind, which provides a little bit more on the 12v rail and is cheaper than the Antec after rebate at newegg.

  2. This is the first computer I'm building so this experience is a learning experience. I read up for about 2 weeks before I ordered everything. I ordered the 380W already but newegg's power supply calculator was telling me I needed a 500W PSU. Sounded a bit off to me.

    I ran my Dell XPS 630i as well and it told me I needed a 900W PSU but I have a 750w PSU that seems to be doing fine. Is there a way to monitor the PSU on the computer?
  3. If I understand what you are saying, you want to monitor how many watts are being used by the system? If so, you can buy a Kill A Watt.

  4. PSU is useful, many of people take use of it
  5. The Antec 380W should be fine, especially if you have it already. The Corsair 400W is also a great choice. For that setup, I imagine 380-400 should be more than enough. I bet you want to run the server 24/7? The best thing to do here would be to get a APC surge protector, or a UPS. Looks good though.
  6. You'll be unlikely to use over 100W.
  7. I used that PSU (Earthwatts EA380 380W) in my HTPC/NAS build. Besides 4xHDD and the SAS RAID card being the more power hungry components, everything else is fairly low-power (undervolted E6300+GF9300 mobo). The aim with those builds is to have high efficiency with low idle power of less than 100W. In the rare instantaneous full load condition it'll still use less than 160W. I would've used a 220W 80Plus PSU if available to achieve even higher efficiency.
  8. You need 14 amps on the 12v rails if you are doing RAID, otherwise even less. You have 27 with the Antec Earthwatts EA380 380W
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