New Mini-ITX E350 HTPC Recommended PSU Wattage?

tl;dr: How many watts should this builds PSU be? Came with a 90W DC Power Supply.

I have tried searching for a calculator that has the AMD E350 APU on it but I have yet to find one. Can anyone estimate how many watts the following mini-itx builds PSU will need? The motherboard came with a 90W DC power brick that it makes me use as the power supply, but I don't know if that will be sufficient.

Zotac Fusion350-b-u Mini-ITX Wireless Motherboard / AMD E350 APU Combo

8GB (2x4gb) DDR3 1066Mhz SODIMM RAM

2TB Seagate Barracuda 7200RPM SATA HDD

Kingston SSDNow V300 Series SV300S37A/120G 2.5" 120GB SATA III Internal Solid State Drive

Future Additions:

2TB Seagate Barracuda 7200RPM SATA HDD

TV Tuner Card (Need to research them first)

Please feel free to rate the build also, all I purchased was the case and the rest I got from a points site so my options were limited.
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More about mini e350 htpc recommended wattage
  1. The board RAM & CPU will use max 10W an SSD could use max 6W most around 3W the HDD up to 7W this is all at maximum load total 25W.
  2. My HTPC uses an E350. I run it on a 65W PSU. No problems there.
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