Questions about supply power, SATA power, fan power, PCIe adapter

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kram000
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Questions about supply power, SATA power, fan power, PCIe adapter

Unread post by kram000 » Thu Nov 21, 2019 3:17 pm

Hello! I'm waiting for my H2 to show up in the mail (tomorrow). My goal for the board is to use an adapter for x4 PCIe SAS controller with eight 2.5" SATA disks. I have just a few questions, any response is appreciated. Thanks in advance!

Can the supply accept greater than 60 watts? I have a 19.5V supply that can push 6.7 amps (130 watts) that I will splice on the proper barrel connector. Since the input is 14V-20V, could it handle a spike of greater than 20V? The supply has an output range of +/-5% possibly outputting 20.47V.

Are the SATA power connectors JST type RE? The only info I see in schematic is "2d54" which I'm assuming is 2.54mm pins. If so, I'll be limited to 2 amps per 5V pin which will hinder my powering of the SATA disks. If I were to run an 80% efficient 12V to 5V converter could I draw 2 amps off the 5V pin and 2 amps off the 12V pin at the same time? What is the total current limit on the SATA assembly? I only need approx 9.8 amps total on the 5V supply to account for all disks spinning up at the same time (staggered spinup or PUIS are possibilities to explore but I want to be able to handle full spinup).

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2 amps @ 12V = 24 watt
24 watt * .8 = 19.2 watt @ 5V
19.2 watt / 5 = 3.84 amps
(3.84 + 3.84 + 2 + 2) * .8 = 11.28 amps counting some inefficiencies
Is the 4-pin fan connector providing 12V or 5V? What specific JST connector is in use? The best I can determine from the schematics is a 5V supply and 1.25mm pins (type GH).

I understand in the networking post that this PCIe adapter seems to work well with non-GPU application. Has anyone tried the bplus adapters? They are pricey but also have good reviews from other sources (working on NUCs).

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Re: Questions about supply power, SATA power, fan power, PCIe adapter

Unread post by odroid » Thu Nov 21, 2019 4:09 pm

1. Your PSU looks fine. It will not fry your H2 board.

2. Refer this thread about compatible SATA power cable and connector. viewtopic.php?f=171&t=33057
We tested two 2.5inch HDDs. I think four 2.5inch HDDs can work without extra step-down converters.
But eight disks need extra power definitely.

3. I think the bplus seems to be compatible with H2. But we didn't try it. Let's wait for other users' replies.
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kram000 (Fri Nov 22, 2019 11:30 am)

RomaT
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Re: Questions about supply power, SATA power, fan power, PCIe adapter

Unread post by RomaT » Fri Nov 22, 2019 1:36 pm

kram000 wrote:
Thu Nov 21, 2019 3:17 pm
Is the 4-pin fan connector providing 12V or 5V?
5V
kram000 wrote:
Thu Nov 21, 2019 3:17 pm
My goal for the board is to use an adapter for x4 PCIe SAS controller with eight 2.5" SATA disks.
Different drive models consume current in different ways, The current of their consumption is written on the label.
Summarize their current consumption, I guess this is at least 8A, You obviously need an extra DC-DC converter (2.5A * 8 pcs = 20A)
kram000 wrote:
Thu Nov 21, 2019 3:17 pm
I understand in the networking post that this PCIe adapter seems to work well with non-GPU application. Has anyone tried the bplus adapters?
Yes, we used
and do not forget, these adapters you need to connect the +12V
therefore, it is better to connect the board to a power supply +12V

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