Two PSUs at once

[Solrix]

Hey. I have a gtx 650 ti boost and I was thinking about getting a 2nd one and using them in SLI. I have a 600watt PSU. In theory could I run my system and one GPU off one PSU and jump start the other PSU and use it for the other GPU. I wouldn't do it I was just curious if it would work.

[miyabwah]

a 650 TI in SLI will not need a second Power Supply...

[Guest]

No idea but that would make me be able to just spend on a low wattage PSU and spend less on a new high wattage PSU to then CF a new HD7870 with my current one.

[Ashley]

600 watts is plenty for 650 ti in SLI.

 

Two power supplies is possible but it's only really useful/worthwhile in professional workstations with multiple CPUs and GPUs.

[defunkt]

hahaha, 650ti SLI doesn't need two psu's.

[BigD1970]

2 gpus can run off a 500 wat psu.

[Vitalius]

You guys are doing the bad habit of not answering the OP's question and just telling him something he already (probably) knows.

Yes OP, you can do that. You can even rig the two PSU's to start at the same time by way of re-wiring them (only 1 wire from one PSU to the other). 

Singularity Computers does this with two 1500w PSU's in one of his more recent build logs. Check it out.

[Guest]

2 gpus can run off a 500 wat psu.

Not 2 HD7870,s in crossfire. Would save me some money, but sadly it just can't be done.

 

Maybe when idle but not when full load or something.

[LapX]

Please don't SLI 2 650 Ti's, sell it and buy a more powerfull card because sometime the scalling is terrible in multiple GPU solutions.

[Solrix]

So like I'm planning on putting an i5 3570k so a 600watt PSU will handle that and the gtx 650 ti boost in SLI?

[defunkt]

2 gpus can run off a 500 wat psu.

no.

[defunkt]

So like I'm planning on putting an i5 3570k so a 600watt PSU will handle that and the gtx 650 ti boost in SLI?

It's fine. but don't get another 650, just get one more powerful graphics card.

[Solrix]

Please don't SLI 2 650 Ti's, sell it and buy a more powerfull card because sometime the scalling is terrible in multiple GPU solutions.

The gtx 650 ti boost scales really good almost 100% in some games

[Goldilock]

It would work, you could buy 24 pin mod kit to gather 2 /3 PSU wattage into one in frozencpu and such things to experiment in extreme overclocking.

 

Sorry for not giving, just too lazy mate.

[defunkt]

The gtx 650 ti boost scales really good almost 100% in some games

No. Just no. I don't know were you have been reading. The 650ti boost sucks. Just get one gpu.

[Solrix]

No. Just no. I don't know were you have been reading. The 650ti boost sucks. Just get one gpu.

Ok I'm still debating it. I found that info from here. http://m.youtube.com/watch?v=S9YMbWXn6Sw

[defunkt]

Ok I'm still debating it. I found that info from here. http://m.youtube.com/watch?v=S9YMbWXn6Sw

No SLI config will scale perfectly. Most cards at the moment are sucking with crappy drivers. Just get one card. it'll use less power to.

[Solrix]

No SLI config will scale perfectly. Most cards at the moment are sucking with crappy drivers. Just get one card. it'll use less power to.

Ok thanks for the help

[amintha1992]

like many of the users said before me. you are better off getting a much higher end GPU with the money that you are going to spend on the 650ti and and the PSU.

 

use that money to buy what ever higher card you can get. 

 

and you absolutely want to do SLI then you can with a 600w PSU.

[KaareKanin]

Hey. I have a gtx 650 ti boost and I was thinking about getting a 2nd one and using them in SLI. I have a 600watt PSU. In theory could I run my system and one GPU off one PSU and jump start the other PSU and use it for the other GPU. I wouldn't do it I was just curious if it would work.

Did everyone just not notice what you wrote, or did you edit?

 

Anyways, to your question. 

It should work just fine. To start a PSU, all one needs to do is to jump the green wire on the 24-pin with a ground-wire, so either of the black ones (assuming, of course, that you don't have PSUs with fancy wires). So what you need to do is trigger both PSUs at the same time (or at least I think you'll need to. If a GPU un-powered at start, i don't think you'll post). I don't think that should be harder than to just splice the green wire and a black one on your secondary PSU to corresponding wires on your primary PSU 

[nightlitezzz]

Now everyone, please read the OP and read it carefully. The OP just wants to know if it's possible to use two PSUs, nowhere did he/she say they wanted to actually do it.

 

Antec has a new PSU feature or something that lets you use two PSUs at once.

[DaftBehemoth]

No. Just no. I don't know were you have been reading. The 650ti boost sucks. Just get one gpu.

SLI scaling with 650ti's isn't nearly as bad as you're making it out to be. Please check your information before posting. Here's some benchmarks to consider, @Solrix

 

 

 

 

Source: http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_650_Ti_Boost_SLI/

[mgsstar]

So like I'm planning on putting an i5 3570k so a 600watt PSU will handle that and the gtx 650 ti boost in SLI?

It is enough if you have a decent psu with at least 80+ bronze. What psu do you currently have?

[Slaeowulf]

Two power supplies is possible but it's only really useful/worthwhile in professional workstations with multiple CPUs and GPUs.

 

This, basically. 

[quan289]

Depending on the design of your PSU, I wouldn't necessary recommend you to do a dual PSU setup. Modern day setup draw most of its power from the +12v rail, and having the PSU power only power your GPU may cause some stability issue with group-regulated design power supplies. Basically, the load of the 3.3/5v rail can have have an affect on the voltages of the +12v and vice versa. You can see this happen on reviews at Jonnyguru, Techpowerup, and such.

 

For example: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=225

Look at the load voltages of the +12v. On the first testing of the 450w model, you will see that it starts at 12.32v and INCREASE to 12.44v. On the other testing, it start out at 12.29v increase slightly to 12.30v and then back down to 12.28v at full load. Just a simple change in load patterns can have a big affect in the voltage drop/increase of the unit.

 

Now if you are just using the secondary PSU to power your GPU which will only going to be supplying high +12v load with no load on the 3.3/5v rail, you are putting your PSU in a crossload situation, where there would be a significant voltage drop on the +12v.

 

If one were to do a dual PSU configuration, they would need to make sure they invest in a proper independent / DC-DC regulated PSU.

 

As for whether or not your PSU can handle two 650 Ti in SLI. You can indeed power them a quality 500w unit. Of course, whether or not your 600w unit is capable of doing so or not, depends on what unit you got.