3.3v on sata

[Moonzy]

so im thinking of buying a sata power splitter for my rig, and i came across molex to sata, which omits the 3.3v

 

short question: what are the odds that my drive would need 3.3v?

samsung 860 evo

silicon power A55 SSD

and several 3.5inch HDD

one 2.5inch HDD (might not be powered by the adapter)

[SavageNeo]

Your drives do use 3.3V. So how many drives in total? 5?

 

what of thsoe are powered by sata? what will be powered by splitter?

 

The splitter shoudl work.

 

What psu is this?

 

Edit: Your drives may use 5V power. Look at the label it should tell.

[Moonzy]

2 minutes ago, SavageNeo said:

Your drives do use 3.3V. So how many drives in total? 5?

will be 7, planned, at least

5x 3.5 inch 2TB drives + both listed SSD

 

2 minutes ago, SavageNeo said:

what of thsoe are powered by sata? what will be powered by splitter?

most probably the 2 SSD that is on the PSU shroud

and 1 3,5 inch, since the chain is only 4 power, i have 5 drive in my cage

 

reason for buying is because all sata power i have is right angled, and i'll have to bend the cables real bad and put a lot of torque on the connector to use them there

 

2 minutes ago, SavageNeo said:

What psu is this?

RM850x

[SavageNeo]

did a bit of googling

 

your samsung ssd use 5V rail

your Silicon SSD also uses 5V

your HDDs most likely will be on the 5V rail.

[Moonzy]

1 minute ago, SavageNeo said:

did a bit of googling

 

your samsung ssd use 5V rail

your Silicon SSD also uses 5V

your HDDs most likely will be on the 5V rail.

i googled and it's not very conclusive

so it's probably fine?

[SavageNeo]

So 2 ssds form the splitter? Ther 3.3V splitter wont work. You will need 5V splitter

 

[mahyar]

Just now, Moonzy said:

i googled and it's not very conclusive

so it's probably fine?

hdd probably needs 12v

[mahyar]

Just now, mahyar said:

hdd probably needs 12v

depends on model though most of 2.5 ones dont nowadays

[SavageNeo]

This supports 5V sata: 

Spoiler

https://www.amazon.com/SATA-Molex-Benfei-Power-Cable/dp/B07PXR1XR1/ref=sr_1_1_sspa?dchild=1&keywords=molex+to+sata&qid=1607516726&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyVEtDTU5CRVpBRFFCJmVuY3J5cHRlZElkPUExMDE3MDc3MllEOEdZWFdDSkw2VSZlbmNyeXB0ZWRBZElkPUEwNTU1OTg2M0laTktQWFlIM0Q5TyZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

Spoiler

https://www.amazon.com/Cable-Matters-3-Pack-Molex-Power/dp/B00STNUB04/ref=sr_1_2_sspa?dchild=1&keywords=molex+to+sata&qid=1607516763&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUE3QUxBQ0NPQjdJTzEmZW5jcnlwdGVkSWQ9QTAzODMzMDUzOVU0NEJGTFBKQlJBJmVuY3J5cHRlZEFkSWQ9QTAyMTg0NzgySldGWjFXTDBGV1hPJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==

 

[Moonzy]

1 minute ago, SavageNeo said:

So 2 ssds form the splitter? Ther 3.3V splitter wont work. You will need 5V splitter

molex to sata would provide both 5 and 12v, and omits 3.3v since molex doesnt carry 3.3v

so as long as my drives are fine without 3.3v, it should be ok

 

1 minute ago, mahyar said:

hdd probably needs 12v

i read somewhere the IC needs 3.3v, and some drive dont have internal converter

while most recent drives do due to adapters like these

 

it's all very blurr

[SavageNeo]

1 minute ago, Moonzy said:

so as long as my drives are fine without 3.3v, it should be ok

oh. Well your drives do not need 3.3V so you will be fine. Sorry I misunderstood.

[porina]

Maybe not a direct answer, but an indirect one. I have a USB-SATA adapter I use for various things. There's only two types of devices I can't use with it: power hungry HDs (older 2.5", most/all 3.5"), and a specific Micron mSATA SSD. For that SSD, I suspect it is the lack of 3.3v rail but I don't have proof of it. The SSDs work fine if put into an actual laptop for example.

 

So I'd guess you'll probably be fine, but can't say with 100% certainty.

[mahyar]

1 minute ago, Moonzy said:

molex to sata would provide both 5 and 12v, and omits 3.3v since molex doesnt carry 3.3v

so as long as my drives are fine without 3.3v, it should be ok

 

i read somewhere the IC needs 3.3v, and some drive dont have internal converter

while most recent drives do due to adapters like these

 

it's all very blurr

well yeah most of modern controllers and ICs of any sort work with 3.3 v or even lower voltages but the required input voltage and current should be on drive itself

[Moonzy]

3 minutes ago, SavageNeo said:

oh. Well your drives do not need 3.3V so you will be fine. Sorry I misunderstood.

aight i'll bite the bullet

 

worst case scenario is that i'll have to buy sata-sata splitter, which are rare for some reason

[vsteel]

Some drives do use 3.3V but it is used for the spin up and down feature of enterprise drives.   That is why sometimes people will buy an enterprise drive and it won't work.  In big data centers they sometimes want to spin down banks of drives to save power.  To shut down the enterprise drives they send power over the 3.3v pin. 

 

For example in my system I have some of those drives and I eliminated the 3.3v signal so they would work in my non enterprise setup.   I am sure there are some out there but I don't know of any drives that NEED the 3.3