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I am looking to build a HTPC and the case that I really like and would like to use is the Relean E-I5
http://www.ecosmartpc.com/ei5.html


Since with this case they offer three options for the power supply:

E-i5 with 60W AC adapter

E-I5 AC adapter up to 84W

E-I5 AC adapter up to 120W

My biggest question is that I do not know which power supply to chose and which one will power the other parts I have chosen?


Here are the other parts I have chosen for my build:

MOBO: ASRock H87M-ITX LGA 1150 Intel H87 HDMI SATA 6Gb/s USB 3.0 Mini ITX Intel Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157386

CPU/GPU: Intel Core i3-4130 3.4 3 FCLGA 1150 Processor
http://www.amazon.com/Intel-i3-4130-FCLGA-Processor-BX80646I34130/dp/B00EUUKVXM

RAM: G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Dual Channel Kit Desktop Memory Model F3-12800CL9D-4GBNQ
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231193

SSD: ADATA USA Premier Pro SP600 2.5-Inch 32 GB SATA III MLC Internal Solid State Drive ASP600S3-32GM-C
http://www.amazon.com/ADATA-Premier-2-5-Inch-Internal-ASP600S3-32GM-C/dp/B009SKB5HA/ref=sr_1_3?s=electronics&ie=UTF8&qid=1369021123&sr=1-3&keywords=ssd+adata
 

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Lets see.

CPU is 54w

about 4w per stick of ram = 8w (can peak to 10w on autoclocking)

That SSD is 1.5w

So far total is about 66w

I've seen a report of a similar setup with the i3 4130 that peaked at 84w for complete system.

I'm not sure how efficiency ratings work with external PSU.

If it was a regular PSU, I would go 120w because of efficiency and possible upgrade/change of cpu.

Using i3 4340 in a similar setup will take about 70-90w normal and 110w (peak)
 

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I recommend the following for AC adapters with these cases:


Atom/Celeron ULV - 60W

Celeron/Pentium/i3 - 84W

i3/i5/i7 - 120W


The reason i3 appears in both places is from my testing of the i3-4130 and i3-4340 there was a surprisingly big enough difference that brought the i3-4340 systems maximum consumption close to 80W. I like to have about a 20% cushion at the high end since at the high end of the rating the +12V input tends to drop. In the real HTPC usage though you're looking to be operating in the 30W range.


The difference in price is $10 between the 84W and 120W.


My measurements with the ASUS H81T/CSM and i3-4130 with a 90W AC adapter:

Windows 7 desktop (nothing running, just sitting idle): 14.8W

Watching 1080p MKV: 19.9W-20.3W

Prime-95: 53.8W

Idle with screen off: 9.8W ( after 15min it turns the screen off automatically and then I let it sit another 15min but it was not in sleep )

Sleep: 1.4W


The MSI H81I motherboard/i3-4340 with a 120W powerboard and 120W AC adapter showed about 30% higher numbers.


I hope that helps you decide on the AC adapter.


Something else to consider is your motherboard has only one USB header. If you want to use the front USB ports and an internal USB IR receiver you need two USB headers.
 
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