Is there any way you can use multiple GPUs with a Corsair CX550M (2015)?

[NunoLava1998]

see the title

[Windows7ge]

Well, Molex to 6 or 6+2 pin adapters. I wouldn't recommend it though if the GPU draws any significant amount of power.

[TVwazhere]

2 minutes ago, NunoLava1998 said:

see the title

If your second GPU is low power draw, you can use dual molex to SATA like I had to for ITNOS. 

 

Otherwise I wouldnt risk it

[NunoLava1998]

Just now, Windows7ge said:

Well, Molex to 6 or 6+2 pin adapters. I wouldn't recommend it though if the GPU draws any significant amount of power.

I'm trying to get a 570/580 which is about 200W. That leaves an 8 pin that needs to be fed (150W, but 125W should be fine). Molex can do 132W. 

Maybe multiple molex to 8pin?

[NunoLava1998]

Just now, NunoLava1998 said:

I'm trying to get a 570/580 which is about 200W. That leaves an 8 pin that needs to be fed (150W, but 125W should be fine). Molex can do 132W. 

Maybe multiple molex to 8pin?

Although i'm trying to run two 570s (which already are 425W) with a r5 1500x (+75W); that leaves literally no room. I should probably get a better PSU in the first case.

[Fasauceome]

Just now, NunoLava1998 said:

I'm trying to get a 570/580 which is about 200W. That leaves an 8 pin that needs to be fed (150W, but 125W should be fine). Molex can do 132W. 

Maybe multiple molex to 8pin?

Are you shooting for crossfire? It's never worth it to use molex to PCIe power if you really care about the system

[NunoLava1998]

Just now, fasauceome said:

Are you shooting for crossfire? It's never worth it to use molex to PCIe power if you really care about the system

No, mining. I don't pay the power.

[Fasauceome]

1 minute ago, NunoLava1998 said:

No, mining. I don't pay the power.

The 570 can run with only 6 pins of power, on a lower power ceiling. You already run GPUs underclocked for mining to get max efficiency anyway, so that would be worth the effort.

 

But buying another GPU and mining to recoup the cost? Your ROI time will be forever, hope you're not mining for profit and only for fun (in which case don't get a second card)

[NunoLava1998]

1 minute ago, NunoLava1998 said:

Although i'm trying to run two 570s (which already are 425W) with a r5 1500x (+75W); that leaves literally no room. I should probably get a better PSU in the first case.

I could pull it off if I buy a 470 though. They sell mining editions of those for 100€ only. That leaves only a 6pin 

[NunoLava1998]

Just now, fasauceome said:

The 570 can run with only 6 pins of power, on a lower power ceiling. You already run GPUs underclocked for mining to get max efficiency anyway, so that would be worth the effort.

 

But buying another GPU and mining to recoup the cost? Your ROI time will be forever, hope you're not mining for profit and only for fun (in which case don't get a second card)

Honestly, it's not bad. A ROI time of about 3 months is pretty good. Most ASICs and even cards like the VII are like, 2x.

[Fasauceome]

Just now, NunoLava1998 said:

Honestly, it's not bad. A ROI time of about 3 months is pretty good. Most ASICs and even cards like the VII are like, 2x.

3 months only, you sure? What are you mining?

[NunoLava1998]

Just now, fasauceome said:

3 months only, you sure? What are you mining?

DaggerHashimoto. 70 cents per day a card. With two cards, that's about 1.5$ a day. For the two cards, it's a 3-4 month ROI time.

Of course I'm not counting electricity in because I don't pay it (otherwise the ROI time would be like, a year).

[Windows7ge]

5 minutes ago, NunoLava1998 said:

I'm trying to get a 570/580 which is about 200W. That leaves an 8 pin that needs to be fed (150W, but 125W should be fine). Molex can do 132W. 

Maybe multiple molex to 8pin?

So you want to push a minimum of 400W for GPUs leaving <150W for the system? That's not even factoring in PSU efficiency and other variables.

 

It's a really bad idea. Don't do it. Besides you could sell off the hardware for more money than you'll ever earn coin mining.

[NunoLava1998]

Just now, Windows7ge said:

So you want to push a minimum of 400W for GPUs leaving <150W for the system? That's not even factoring in PSU efficiency and other variables.

 

It's a really bad idea. Don't do it. Besides you could sell off the hardware for more money than you'll ever earn coin mining.

I just realized you can buy a 470 for cheaper and it draws enough power that about 100W are left counting the 2 GPUs and my OCd CPU. I have a M.2 drive and two SATAs; that's 30W. It should still leave some headroom for the rest of the system, although it's on edge mostly

[NunoLava1998]

So, something like this? With both GPUs + CPU, that's 100~120W headroom. That's definitely enough

(i don't pay the power thats why i mine)

[Windows7ge]

3 minutes ago, NunoLava1998 said:

I just realized you can buy a 470 for cheaper and it draws enough power that about 100W are left counting the 2 GPUs and my OCd CPU. I have a M.2 drive and two SATAs; that's 30W. It should still leave some headroom for the rest of the system, although it's on edge mostly

Running a PSU at near max output 100% of the time when it's not designed for continuous load (like server PSUs) will dramatically decrease the lifespan of the unit and could cause it to fail spectacularly. There's a reason miners go strait for >=1000W units. The headroom is necessary to ensure the longevity of the PSU and subsequently the hardware it's powering.

[NunoLava1998]

Just now, Windows7ge said:

Running a PSU at near max output 100% of the time when it's not designed for continuous load (like server PSUs) will dramatically decrease the lifespan of the unit and could cause it to fail spectacularly. There's a reason miners go strait for >=1000W units. The headroom is necessary to ensure the longevity of the PSU and subsequently the hardware it's powering.

It's probably going to be drawing 400-500W max on a 550W PSU. 

I do think I should be getting a new PSU anyway. What's the best 600W+ unit that's atleast in the same bracket as the corsair cx?

[NunoLava1998]

15 minutes ago, NunoLava1998 said:

It's probably going to be drawing 400-500W max on a 550W PSU. 

I do think I should be getting a new PSU anyway. What's the best 600W+ unit that's atleast in the same bracket as the corsair cx?

Actually it's a Corsair CX550M, a good unit, and my system _WILL_ take breaks sometimes (for troubleshooting, gaming where it draws less power, etc).

[Windows7ge]

22 minutes ago, NunoLava1998 said:

It's probably going to be drawing 400-500W max on a 550W PSU. 

I do think I should be getting a new PSU anyway. What's the best 600W+ unit that's atleast in the same bracket as the corsair cx?

If you plan to run it around the clock I wouldn't stay in the CX bracket. Look into something like RMi/RMx, or AXi.

[NunoLava1998]

44 minutes ago, Windows7ge said:

If you plan to run it around the clock I wouldn't stay in the CX bracket. Look into something like RMi/RMx, or AXi.

I'm not planning to mine for more than one year. If I did want to mine for more than one year, I'd likely already bought a new PSU.

The only concern is that the GPUs are going to be right next to each other (2-3mm distance), but again I'm planning on buying a new, 75CFM 120mm case fan for that

[Windows7ge]

54 minutes ago, NunoLava1998 said:

I'm not planning to mine for more than one year. If I did want to mine for more than one year, I'd likely already bought a new PSU.

The only concern is that the GPUs are going to be right next to each other (2-3mm distance), but again I'm planning on buying a new, 75CFM 120mm case fan for that

I don't think your CXM unit would run 24/7 for 365 days at near full load without prematurely dying or having a cable catch fire because it got too hot.

[Guest]

22 minutes ago, Windows7ge said:

I don't think your CXM unit would run 24/7 for 365 days at near full load without prematurely dying or having a cable catch fire because it got too hot.

It'll run 24/7, no problem.  But the cable catching fire is a legit concern with those Molex to PCIe adapters.  Don't get a cheap one.

[Herman Mcpootis]

4 hours ago, jonnyGURU said:

But the cable catching fire is a legit concern with those Molex to PCIe adapters.  Don't get a cheap one.

how good are the ones included with GPUs? just asking since i have a few lying around.

[Guest]

1 hour ago, Herman Mcpootis said:

how good are the ones included with GPUs? just asking since i have a few lying around.

Those should be fine.

 

[comicsansms]

20 minutes ago, jonnyGURU said:

Those should be fine.

 

The ones that came with my Sapphire R9 280 were single Molex to PCIe 6 pin (and it came with 2!)

Let's run a Tahiti Flagship off a firehazard 6000w, and use both of those adaptors. I wanna see the world burn