Do the Molex Powered Risers need to come from same 12v rail as MOBO?

Mk2vr6 (OP)

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Do the Molex Powered Risers need to come from same 12v rail as MOBO?

March 11, 2014, 01:01:42 PM

As above really.

Have a Dell 1440w server PSU nearly ready to go, but need to know if I need to use the 'MOBO' PSU to power the risers?

Thanks

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Mk2vr6 (OP)

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Re: Do the Molex Powered Risers need to come from same 12v rail as MOBO?

March 11, 2014, 01:09:55 PM

Also, how much power is drawn through the powered risers?

Omikifuse

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Re: Do the Molex Powered Risers need to come from same 12v rail as MOBO?

March 12, 2014, 02:45:31 AM

Quote from: Mk2vr6 on March 11, 2014, 01:09:55 PM

Also, how much power is drawn through the powered risers?

Powered risers molex draw max of 75 watt which is the same as if you use 16x PCI-e riser without molex.

Mk2vr6 (OP)

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Re: Do the Molex Powered Risers need to come from same 12v rail as MOBO?

March 12, 2014, 02:48:18 AM

Quote from: Omikifuse on March 12, 2014, 02:45:31 AM

Quote from: Mk2vr6 on March 11, 2014, 01:09:55 PM

Also, how much power is drawn through the powered risers?

Powered risers molex draw max of 75 watt which is the same as if you use 16x PCI-e riser without molex.

Thank you.

Do the powered risers have to come from the same 12v rail as the motherboard?

HellDiverUK

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Re: Do the Molex Powered Risers need to come from same 12v rail as MOBO?

March 12, 2014, 01:00:57 PM

This question is unanswerable - it depends on the PSU.

Gazylion

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Re: Do the Molex Powered Risers need to come from same 12v rail as MOBO?

March 12, 2014, 03:02:18 PM

Quote from: Mk2vr6 on March 12, 2014, 02:48:18 AM

Quote from: Omikifuse on March 12, 2014, 02:45:31 AM

Quote from: Mk2vr6 on March 11, 2014, 01:09:55 PM

Also, how much power is drawn through the powered risers?

Powered risers molex draw max of 75 watt which is the same as if you use 16x PCI-e riser without molex.

Thank you.

Do the powered risers have to come from the same 12v rail as the motherboard?

They should because of voltage difference between both psus. From experience I would say that best idea is to power risers from one psu, even though with some psus it works other way without problems.

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