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Multi-rail and PCI-E power question

post #1 of 9
Thread Starter 
I need to hear from a PSU expert on this, I'm kind of clueless.

So, let's say you had the HX1000 and a GTX580. The GTX580 requires 8+6 power from the PSU.

What would happen if you had the 8-pin modular plugged into one rail (12V1) and the 6-pin modular plugged into the second rail (12V2)?

Thanks
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post #2 of 9
it'll work. just wasting cables cuz hx1000 should have 2 6+2pins on 1 rail.

ive personally tried it before. not a psu expert.

i originally thought that was how it HAD to be done.
then learned 1 rail is enough. Its power, if it has enough it works.
Edited by jpao - 1/27/11 at 6:56am
post #3 of 9
Quote:
Originally Posted by Plex View Post
What would happen if you had the 8-pin modular plugged into one rail (12V1) and the 6-pin modular plugged into the second rail (12V2)?
Assuming you aren't sticking things in the wrong holes... Or using all sorts of adapters...

On a properly designed PSU, rails are a non-issue.
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post #4 of 9
Dependant on how many SATA and Molex devices you have running, it'll even out the load if you run one from 12V1 and one from 12V2, 12V1 rus the ATX and CPU Power, 12V2 runs all your HDD's/DVD's and Peripherals.
40A on each rail, it'd just even the load out a bit more.

It shouldn't really matter though, that PSU is solid.
 
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post #5 of 9
Thread Starter 
Ah.. I was hoping you guys would tell me how bad of an idea it was and how it could cause artifacting.

I would explain it over again, but I think I'll just link my thread on EVGA, lol.
http://www.evga.com/forums/tm.aspx?m=811877
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post #6 of 9
There's no reason it should, if you were running SLI'd 580's, you likely be okay with a good 850W unit.

Using one on one rail, and one on another on a single won't damage it like sk2play stated, it evenly distributes the power draw between the rails if anything.

That PSU shouldn't be struggling with a single 580 at all, you said you'd checked the PSU aswell.

Have you tried taking down your CPU OC temporarily?

How did you check for stability with your CPU and RAM (I saw you ram Memtest)? And when was the last time you did so?

When installing the drivers (prior to the latest ones, which some 580 users have seemingly reported problems with), did you choose the custom install to clean out all previous Display Drivers?

The fact you've gone through three 580's is mad!
 
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post #7 of 9
Thread Starter 
Hey Evo! Thanks for your response. Let me tackle this bit-by-bit.

Quote:
There's no reason it should, if you were running SLI'd 580's, you likely be okay with a good 850W unit.
Aye. I'm not concerned at all about it being powerful enough. I am worried that my previous 580s (the ones I RMA'd) weren't getting enough power, and that was causing the artifacts. Not because the PSU isn't powerful enough, but because the rails weren't being distributed very well.

Quote:
Using one on one rail, and one on another on a single won't damage it like sk2play stated, it evenly distributes the power draw between the rails if anything.
By this, did you mean using two separate cards on two separate rails? I was asking about using two separate rails to power one single card.

Quote:
That PSU shouldn't be struggling with a single 580 at all, you said you'd checked the PSU aswell.
Aye. BIOS readings are solid. Multimeter readings were also in range.

Quote:
Have you tried taking down your CPU OC temporarily?
I did. The problem persists through a complete CMOS reset. It has yet to crop up again since I switched the rails around, though.

Quote:
How did you check for stability with your CPU and RAM (I saw you ram Memtest)? And when was the last time you did so?
I fold, so my CPU and GPU are constantly being tested for stability. They are both rock-solid-stable. I ran a Memtest+ a few days ago, error-free.

Quote:
When installing the drivers (prior to the latest ones, which some 580 users have seemingly reported problems with), did you choose the custom install to clean out all previous Display Drivers?
Cleaned out previous drivers completely. Problem persisted even after upgrading as newer drivers are being released. I'm very reluctant to consider this a software issue at this point.

Quote:
The fact you've gone through three 580's is mad!
I try not to think about it. Luckily EVGA support is pretty amazing.


I'm leaning towards an underlying PSU or mobo issue at this point in time.
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post #8 of 9
Quote:
Originally Posted by Plex View Post
Hey Evo! Thanks for your response. Let me tackle this bit-by-bit.



Aye. I'm not concerned at all about it being powerful enough. I am worried that my previous 580s (the ones I RMA'd) weren't getting enough power, and that was causing the artifacts. Not because the PSU isn't powerful enough, but because the rails weren't being distributed very well.
Yep, they only put 42A as the entire system, and assume you have the most powerful processor, with maxumim HDD's and all that polava to make sure they're well covered, they often exaggerate ho much power is required, to account for poorly made and cheap PSU's.

580's shouldn't pull anymore than 20A alone, if you have 40A on each rail, you'd be fine running a single 580 with both leads outta a single rail.

Quote:
By this, did you mean using two separate cards on two separate rails? I was asking about using two separate rails to power one single card.
Nar, I meant what you'd asked, sorry. One lead from 12V1 and one lead from 12V2 won't cause artifacting or problems, it's evenly spreading the load between both rails on a single card.

Lower wattage PSU's with quad rails at 18A each or whatever on midrange cards are run like that, one PCI-E 6-pin from one rail, one PCI-E from another. For example.

Quote:
I'm leaning towards an underlying PSU or mobo issue at this point in time.
Have you got the Molex PCI-E plugged in on the Mobo above the top PCI-E slot?
Have you tried the card in another PCI-E slot on your Rampage? Could be a dodgy slot? It happens.

I honestly don't know what else to suggest. If you had a spare HDD or enough for a partition, you could give that a shot, just to rule out software, otherwise I'm stumped. I'm leaning more to the possibility of Software or other problem elsewhere, but that's just my personal opinion based on all I've read in the EVGA forums.
EDIT:-(By the way, that guy that stated "80+ means the combined Amperage of the 12v rails is over 80A" when it's actually the efficiency rating. Don't listen to him. )

If you want complete confirmation on your PSU's abilities, give Tator Tot or Pheadrus2129 a PM, they're our resident PSU Guru's, and can put your mind at ease in that regard, or tell you something I don't know.
Edited by EvoBeardy - 1/27/11 at 8:35am
 
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post #9 of 9
Quote:
Originally Posted by Plex View Post
Aye. I'm not concerned at all about it being powerful enough. I am worried that my previous 580s (the ones I RMA'd) weren't getting enough power, and that was causing the artifacts. Not because the PSU isn't powerful enough, but because the rails weren't being distributed very well.
Have you monitored temperatures?

If you really, really, really want the culprit to be the PSU, then go ahead and buy a new PSU. Seriously, the Corsair AX1200 is whispering "Plex, buy me." Whether or not it fixes your issue (which you won't know because maybe the first two cards were indeed just faulty) it will give you peace of mind, which is a valuable commodity. The AX1200 also is 80Plus Gold so you will get better efficiency, plus it is fully modular so you won't have to find a place to tuck that unused 4-pin +12v plug (why do companies keep including both a single 4 pin and the 4+4 pin EPS?).
Edited by Zap - 1/27/11 at 9:55am
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Main home rig
(15 items)
 
  
CPUMotherboardGraphicsRAM
Core i5-3570K ASRock Z77E-ITX GeForce GTX 670 8GB Samsung DDR3 
Hard DriveOptical DriveCoolingOS
Intel 330 240GB SSD, Crucial M4 256GB mSATA SSD... Samsung DVDRW CoolIt Eco Windows 7 Home Premium x64 
MonitorKeyboardPowerCase
Samsung 305T Plus, Dell 2005FPW Cooler Master QuickFire Pro mechanical keyboard Rosewill Capstone 450W Lian Li PC-Q11B 
MouseMouse PadAudio
Logitech MX518 Allsop Metal Onkyo TX-SR505 receiver, Polk bookshelf speaker... 
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Reply
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