Molex to 6 pin, is it safe?

[SecretX]

Ok, I got a new card, GTX 970 windforce. My card requires 8 pin + 6 pin to properly function, but my PSU (CX 450W) just have one 8 pin cable. My question is: is safe to buy a molex to 6 pin adapter and use it to power my GPU? Also, I noticed that these adapters requires 2 molex conectors, can I use just one cable to power this adapter or do I need to use both molex cables coming direct from the PSU?

 

 

 

 

[Ankerson]

NO....

 

You need to get a new PSU.

[Bad5ector]

Sure... just make sure you have good house insurance for the fire you will likely start...

[SecretX]

2 minutes ago, Ankerson said:

NO....

 

You need to get a new PSU.

My processor is a Ryzen 7 2700 (not OCed), are you sure I can't use it?

[mahyar]

i have a suggestion for you buy a new psu and kick old one as hard as you can

[Ankerson]

2 minutes ago, SecretX said:

My processor is a Ryzen 7 2700 (not OCed), are you sure I can't use it?

 

Yes I am sure....

 

Get a new PSU...

[SecretX]

2 minutes ago, mahyar said:

i have a suggestion for you buy a new psu and kick old one as hard as you can

I can't do this ATM, got no money. Here https://www.guru3d.com/articles-pages/gigabyte-geforce-gtx-970-g1-gaming-review,7.html they say it just uses 280W full load with a i7 extreme, my PSU is 450W why it wouldn't work?

[Energycore]

It will.

 

The CX450 can easily drive a 970. In fact it seems kinda stupid that they put anything more than an 8-pin on a GTX 970 card.

 

Make sure to get the 2x molex to 1 6-pin or 6+2-pin. Not the 1 molex ones, molex is not rated for as much power.

[Moonzy]

9 minutes ago, SecretX said:

PSU (CX 450W)

this one?

 

[Energycore]

4 minutes ago, mahyar said:

i have a suggestion for you buy a new psu and kick old one as hard as you can

9 minutes ago, Ankerson said:

NO....

 

You need to get a new PSU.

I suspect both of you have not looked at the quality of the Corsair CX450 (grey label) series. It is a very good power supply, capable of delivering full power without a hitch.

[Energycore]

Just now, Moonzy said:

this one?

There is no 450W model for the old, bad version. Those were 430, 500 and 600

[mariushm]

The 2700 will consume up to 100-120 watts.

The GTX 970 will consume up to 180 watts.

Your ram and motherboard will consume around 25 watts.

 

So you need  psu that can provide at least 120+180+25 = 325 watts on the 12v output.

The CX450 can probabl output up to 400 watts on the 12v output ... so it would work, but you'd be using it at close to maximum.

 

A single molex connector  is rated for 5A of current, so that's max 5 x 12v = 60 watts.  A 6 pin pci-e connector is rated for 75w so technically an adapter that converts 2 molex into 6 pci-e should be able to easily provide 75w to video card without the connectors overheating or burning up.

Provided the psu can keep up, it should work

[SecretX]

6 minutes ago, Moonzy said:

this one?

 

https://m.kabum.com.br/produto/91021/fonte-corsair-450w-80-plus-bronze-cx450-cp-9020120-br

[emosun]

6 minutes ago, Energycore said:

I suspect both of you have not looked at the quality of the Corsair CX450 (grey label) series. It is a very good power supply, capable of delivering full power without a hitch.

yeah , but molex adpaters burn up is the problem

I've never had it happen to me , but what i think has no bearing on the statistic of them melting becuase they are garbage

[Moonzy]

Just now, SecretX said:

https://m.kabum.com.br/produto/91021/fonte-corsair-450w-80-plus-bronze-cx450-cp-9020120-br

you'll be close to the PSU's limit, but it can be done as mariushm said

 

6 minutes ago, mariushm said:

The CX450 can probabl output up to 400 watts on the 12v output ... so it would work, but you'd be using it at close to maximum.

it can output all 450W from the rail, based on spec

[mariushm]

Just now, Moonzy said:

you'll be close to the PSU's limit, but it can be done as mariushm said

 

it can output all 450W from the rail, based on spec

That may be, but you have to account for the 3.3v and 5v .... if the psu uses dc-dc converters. then those take 12v from the 12  output to those voltages as needed.

If the pc consumes 30w on 5v and 3.3v, the psu probably used around 32w from 12v to produce those voltages and currents (32w because conversion is not 100% efficient)

[Helpful Tech Witch]

13 minutes ago, Energycore said:

I suspect both of you have not looked at the quality of the Corsair CX450 (grey label) series. It is a very good power supply, capable of delivering full power without a hitch.

Molex adaptors are known for being unsafe. They work, but can have disasterous concequences. In one video (it was Jayz or Linus) someone said something along the lines of "Never use a miles adaptor. We have a saying 'molex to sata lose all your data'" 

[Ankerson]

17 minutes ago, Energycore said:

I suspect both of you have not looked at the quality of the Corsair CX450 (grey label) series. It is a very good power supply, capable of delivering full power without a hitch.

 

It's rated at 40C so there is always that to look at....

 

And then the adaptors and pushing it toward max capacity..... 

 

It's going to be a leaf blower at best case...

[Tristerin]

Would I do it?  Um yes.  No doubt.  But then again, Ive never had issues like everyones ghost stories to temper my thoughts on this.  

 

Hell I have 3 GPUs set up for folding for next month using adapters lol.  Worse case PSU shuts down while some wire smell and melt occurs.

[Energycore]

20 minutes ago, emosun said:

yeah , but molex adpaters burn up is the problem

I've never had it happen to me , but what i think has no bearing on the statistic of them melting becuase they are garbage

They will melt if you push too much current, for sure. But a GTX 970 is not going to do that. Especially considering this is a 970 with 2 pcie connectors.

15 minutes ago, mariushm said:

That may be, but you have to account for the 3.3v and 5v .... if the psu uses dc-dc converters. then those take 12v from the 12  output to those voltages as needed.

If the pc consumes 30w on 5v and 3.3v, the psu probably used around 32w from 12v to produce those voltages and currents (32w because conversion is not 100% efficient)

Modern PSUs from 2012(ish) on that aren't garbage can output the same power as they're rated for on just the 12V rail.

15 minutes ago, CircleTech said:

The worst case scenario is your PSUs OCP doesn't trip and it catches fire, shorts, and takes out the rest of your computer with this.

We're talking about a CX450 PSU here. You're assuming OP has a PSU without OCP (and OP can sue Corsair for damages if it doesn't trip and sets the computer on fire, because it claims OCP and every review of it shows OCP/OPP working).

10 minutes ago, Ankerson said:

 

It's rated at 40C so there is always that to look at....

 

And then the adaptors and pushing it toward max capacity..... 

Please tell me under what math a 145W Graphics Card is going to push a 450W PSU over max capacity. The second 6-pin connector is completely unnecessary in this GPU.

[emosun]

1 minute ago, Energycore said:

They will melt if you push too much current, for sure. But a GTX 970 is not going to do that. Especially considering this is a 970 with 2 pcie connectors.

yeah I've never ever heard someone of any respectable reputation say to use them so I'm not about to recommend them. Psu may be fine but still am not going to recommend it.

I'd sooner solder actual pci-e cables onto the unit over using an adapter but i wouldnt even recommend that to a novice.

[Energycore]

Just now, CircleTech said:

All modern PSUs have OCP. I'm assuming that OCP would fail to trip. I've seen it happen before. I set fire to a Dell PSU that claimed to have OCP.

I would not have trusted a PSU to have the protection circuits it claims if I didn't see a review.

 

Thing is, dozens of outlets reviewed the CX(2017) series. It was highly regarded as a great PSU for cheap. But the spread of misinformation might push OP to make an unnecessary decision and waste money (and they've already stated they can't afford a new PSU).

[Bad5ector]

My concern was with the first thought of just using ONE molex of a two molex to PCI power and hope everything would be fine. That is a recipe for disaster... as I found when daisy chaining these thing to power my ASIC miners back in the day. More than once I smelled something burning, only to find that one of the 12v cables were completely disintegrated.

[Energycore]

1 minute ago, CircleTech said:

I guess if they wanted to be cheap about it, they could use the adapter then just run furmark + Intel Burn test for 24 hours. Worst case scenario for a properly built PSU is it shuts down.

 

But If at any point they smell any smoke, then we have our answer.

I can't call this "cheap" when the alternative is functionally the same, but this would be a safe test yes.

 

20 bucks says it'll be fine for 5 years.

[Energycore]

Just now, Bad5ector said:

My concern was with the first thought of just using ONE molex of a two molex to PCI power and hope everything would be fine. That is a recipe for disaster... as I found when daisy chaining these thing to power my ASIC miners back in the day. More than once I smelled something burning, only to find that one of the 12v cables were completely disintegrated.

Yup, it's important to use 2 molex to 6-pin adapters.