1 PSU cable to power 3090

[Ankerson]

4 minutes ago, Stahlmann said:

https://de.pcpartpicker.com/products/power-supply/#e=6,5,4&A=850000000000,2000000000000&p=1&sort=price&page=1&X=0,20047

 

What would be the best option for an upgrade while not completely breaking the bank? The ION+ actually looks like a great option. Noise is porobably the most important factor for me. I have absolutely no idea what the difference between all these units is, apart form build quality of course. Most of them are in the A tier, so what do i get for the more expensive ones? (I'd probably never buy that GameMax thingy tho, looks scetchy)

 

The ION+ is based off the FOCUS... They aren't known for quiet operation. 

 

The RMX would be the quietest with the quality really.

[Mateyyy]

1 minute ago, Ankerson said:

The ION+ is based off the FOCUS... They aren't known for quiet operation. 

The Ion+ is not using the same platform as any of Seasonic's Focus units, and even if it was, that doesn't mean that it couldn't have a better fan (which it does).

Spoiler

 

[Stahlmann]

@Mateyyy @Ankerson

 

You've given me quite a few options there. What is the best choice for the quietest possible operation? My system is very, very quiet and it is quite possible that a new PSU will be the loudest part.

[Ankerson]

Just now, Stahlmann said:

@Mateyyy @Ankerson

 

You've given me quite a few options there. What is the best choice for the quietest possible operation? My system is very, very quiet and it is quite possible that a new PSU will be the loudest part.

 

Your RMX is quiet, so sticking with a new RMX would give you the same thing just higher wattage.

 

 

[Ankerson]

3 minutes ago, Mateyyy said:

The Ion+ is not using the same platform as any of Seasonic's Focus units, and even if it was, that doesn't mean that it couldn't have a better fan (which it does).

  Reveal hidden contents

 

 

Yeah, you are right, I was thinking about another PSU.

[jazz9]

According to the specs the RM is rated at 50°C not 40

https://www.corsair.com/us/en/Categories/Products/Power-Supply-Units/Power-Supply-Units-Advanced/RM-Series™-80-PLUS-Gold-Power-Supplies/p/CP-9020195-NA#tab-tech-specs

 

Continuous output rated temperature C

50°C

[Guest]

On 9/30/2020 at 1:28 PM, Ankerson said:

 

No, it's not....

 

http://www.jongerow.com/Corsair_PSU_hierarchy/index.html

 

 

 

20 hours ago, jazz9 said:

According to the specs the RM is rated at 50°C not 40

https://www.corsair.com/us/en/Categories/Products/Power-Supply-Units/Power-Supply-Units-Advanced/RM-Series™-80-PLUS-Gold-Power-Supplies/p/CP-9020195-NA#tab-tech-specs

 

Continuous output rated temperature C

50°C

Yeah.  My personal site is wrong.  It's actually rated at 50°C.  Not 40°C.  I need to fix that.

 

[jazz9]

On 10/1/2020 at 11:40 PM, jonnyGURU said:

 

Yeah.  My personal site is wrong.  It's actually rated at 50°C.  Not 40°C.  I need to fix that.

 

Just curious, what's the reason for putting the TX-M over the RM?

Now I only have veeeeery superficial knowledge about PSUs, but just comparing the data from Cybenetics the RM seems to me the better option in pretty much every category.

It doesn't have all Japanese caps but i'm guessing that doesn't matter that much as long as the ones used are also good quality and rated at the same temps (or is that not the case?)

 

[doctorzeus1aonly]

So I just had almost the exact same situation and can confirm 100% that using 2 separate cables for each 8-pin PCIE power connector does indeed help (ALOT)..

I was suspicious of this as I got a solid 60fps+ in death stranding on ultra at 5k but I had these massive lag spikes every so often. Brought up nvidia-smi (I'm on Linux) and saw that the lag spikes occurred when the GPU was trying to pull > 300W of power. Re-connected each 8-pin to its own cable to the PSU and now have no lag spikes with this at all..

I have a Ryzen 3950x with an RTX 3090 and a Corsair RM 750x PSU ..

[Stahlmann]

4 minutes ago, doctorzeus1aonly said:

So I just had this exact same situation and can confirm 100% that using 2 separate cables for each 8-pin PCIE power connector does indeed help (ALOT)..

I was suspicious of this as I got a solid 60fps in death stranding on ultra at 5k but I had these massive lag spikes every so often. Brought up nvidia-smi (I'm on Linux) and saw that the lag spikes occurred when the GPU was trying to pull > 300W of power. Re-connected each 8-pin to itsr own cable to the PSU and now have no lag spikes with this at all..

Since my OP i tried both and in my case there is absolutely no difference when using 2 cables compared to 1. My clocks, wattage, etc. all stays the same. Even when overclocking there is no difference for me. Stability is also the same. I'm using 2 cables now anyway, as my PSU has enough connectors.

[doctorzeus1aonly]

56 minutes ago, Stahlmann said:

Since my OP i tried both and in my case there is absolutely no difference when using 2 cables compared to 1. My clocks, wattage, etc. all stays the same. Even when overclocking there is no difference for me. Stability is also the same. I'm using 2 cables now anyway, as my PSU has enough connectors.

Interesting to know, sounds like its pretty dependent then..

Most PSU's have better power allocation on different pin groups/ports so maybe that has something to do with it..

[Stahlmann]

33 minutes ago, doctorzeus1aonly said:

Interesting to know, sounds like its pretty dependent then..

Most PSU's have better power allocation on different pin groups/ports so maybe that has something to do with it..

As the Corsair RMx series are good PSUs, it could just be that they don't really care. I can see it being a problem with lower quality units maybe.

[Falkentyne]

On 9/30/2020 at 11:55 AM, Stahlmann said:

Hello good people,

 

tomorrow my 3090 will arrive. I was wondering: My current GPU power cable is a single 8-pin PCIe power cable on the PSU side and it splits up to 2x 6+2-pin cables on the GPU side. The 3090 model i'll have is the Asus TUF with 2x 8-pin connectors. Can i just run this one cable or do i need to run 2 seperate 8-pin cables from my PSU? How do these pigtail-type cables work?

 

Are you using a RM 650 or RM 850?

If it's a RM 650, please upgrade that PSU.  It's not sufficient for a RTX 3090 and it's below Nvidia's own requirements for it.

I personally recommend Seasonic PX-850 (oneseasonic version) or better, TX-850 or better or GX-850 or better, but of course there are plenty of other options.

 

And if thats an 850W and not a 650W, then PLEASE use TWO PCIE cables to TWO PSU CONNECTORS on the PSU and not one, unless it's one of those "special" connectors that are 12 pin (e.g. some BeQuiet models).  If it is, please VERIFY that there are THREE live 12v wires for each group of 6 wires coming from the PSU and not just two live 12v wires per 6 pin group (there were some "12 pin" groups in the past that split into two 8 pin cables, where the third 12v wire was not active on each 8 pin group.  This was on older PSU models though (like years old).  I do not know if this applies to modern BeQuiet's with a 12 pin PCIE PSU bank.

 

Just putting this out there:
Someone recently MELTED his PSU cable connector by trying to use a single 8 pin into 2x 2*6pins in his (I think) 3080 or 3090.  It was on reddit.  Don't be that guy.