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[ Nvidia SLI weird problem ] Very challenging problem, None of the expert people i know could fix it - Help Needed.

Tags:
  • Overclocking
  • Power Supplies
  • Graphics Cards
  • SLI
  • Nvidia
Last response: in Graphics & Displays
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August 25, 2013 6:30:52 PM





Hello Everyone .

My problem started 2 weeks ago when suddenly my 2x GTX 660 SLI stopped working ( All games instantly crashing after i open it ) While everything is fine on a single card - I thought it's Nvidia beta driver 326.80 that cause the error , So i re-installed the stable driver again 314.22 , Same thing happened , Installed a fresh copy of windows 7 & tried with the stable driver again 314.22 ( It used to work smooth with those drivers before ) , The problem still exist .

I installed all needed programs again and updated windows and problem still there , so I kept trying to solve the problem with these ways ( as people suggested ).

- Reset my motherboard
- Tried all Nvidia drivers with driver cleaner pro
- Tried single card only and both cards are working fine
- Replaced the SLI bridge with a new one
- Tried to change some settings in my MB and Nvidia control panel
- Tried to update both cards bios and i found that both cards are running with the latest bios and both of them having same settings and values - So i didn't flash them.


- Could it be the PSU ? But it was working fine 2 weeks ago & Everyone said PSU is fine.

This problem is killing me slowly , I'm out of ideas and i gave up thinking ,I am willing to pay money even to get this fixed , so one of my friends suggested to open a topic here , I will appreciate your help guys not only with thanks in the forum , for the one who will fix this .


Anyway , This is my computer setup ..

i7-3770K
h 80 cooler
2x Gtx 660 sli
couger 650 w PSU
ASUS MAXIMUS V FORMULA
16 GB ram
2x intel SSD 250gb
samsung 27 3d
.
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More about : nvidia sli weird problem challenging problem expert people fix needed

August 25, 2013 6:36:41 PM

were you using any over clocking programs such as afterburner?
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a b K Overclocking
a b U Graphics card
August 25, 2013 6:37:58 PM

so you tried games on both cards, solo? what about the bridge could be defective.
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a b K Overclocking
a c 217 U Graphics card
a c 83 Î Nvidia
August 25, 2013 6:40:24 PM

I had a similar problem recently, and it was my PSU. Even though I had a 850W Antec 80+ bronze PSU. It went bad, and caused crashes. Both cards worked on their own, and both worked in either PCIe slot (make sure you tested each PCIe slot on their own).

It is possible the motherboard went bad if the cards won't work alone in the 2nd PCIe slot.
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August 25, 2013 6:59:04 PM

asven1 said:
were you using any over clocking programs such as afterburner?


i've tried to overclock both cards before with afterburner and oc guru but it was crashing with tests even if i increase gpu clock with 10 only , one of my friends told me that your 660 s are OC version and they are already overclocked , however at that time everything was running smooth and i was busy gaming .
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August 25, 2013 7:00:11 PM

sparkz89 said:
so you tried games on both cards, solo? what about the bridge could be defective.


yes tried both things , everything seems fine .

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August 25, 2013 7:04:07 PM

bystander said:
I had a similar problem recently, and it was my PSU. Even though I had a 850W Antec 80+ bronze PSU. It went bad, and caused crashes. Both cards worked on their own, and both worked in either PCIe slot (make sure you tested each PCIe slot on their own).

It is possible the motherboard went bad if the cards won't work alone in the 2nd PCIe slot.


I tested both slots with th other card , everything is cool , The PSU is coming to mind again ( i was in doubt when i bought this couger psu ).
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a b K Overclocking
a b U Graphics card
August 25, 2013 7:26:15 PM

its your PSU lmao if you doubt it ask your friends to borrow their spare psu and set it up.
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Best solution

a b K Overclocking
a b ) Power supply
a c 665 U Graphics card
a c 457 Î Nvidia
August 25, 2013 7:27:23 PM

http://www.hardwaresecrets.com/article/Cougar-RS-650-W-...

Your PSU is in reality a 600 watt unit and apparently explodes if asked to deliver more than 600 watts. It is not recommended by Hardwaresecrets.com.

In addition to that, Guru3d recommends a quality 700 watt power supply for GTX 660s in SLI.
http://www.guru3d.com/articles_pages/msi_geforce_gtx_66...

Replace your PSU with something more reputable and at least 700-750 watts.
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August 25, 2013 7:29:51 PM

sparkz89 said:
its your PSU lmao if you doubt it ask your friends to borrow their spare psu and set it up.


i don't have this option , also have to drive 8 hours if i am getting new one.
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August 25, 2013 7:32:39 PM

17seconds said:
http://www.hardwaresecrets.com/article/Cougar-RS-650-W-...

Your PSU is in reality a 600 watt unit and apparently explodes if asked to deliver more than 600 watts. It is not recommended by Hardwaresecrets.com.

In addition to that, Guru3d recommends a quality 700 watt power supply for GTX 660s in SLI.
http://www.guru3d.com/articles_pages/msi_geforce_gtx_66...

Replace your PSU with something more reputable and at least 700-750 watts.



Thanks 17seconds for replying me i really appreciate it, Well i am going with your suggestion & will buy a new PSU , any suggestions ?
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August 25, 2013 7:34:58 PM

So the PSU was the reason i couldn't overclock my cards without crashes ?
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a b K Overclocking
a c 217 U Graphics card
a c 83 Î Nvidia
August 25, 2013 7:36:11 PM

Atiff Chaker said:
So the PSU was the reason i couldn't overclock my cards without crashes ?


It definitely is one reason that can happen.
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a c 665 U Graphics card
a c 457 Î Nvidia
August 25, 2013 7:44:03 PM

You were asking too much from a low-quality PSU. Overclocking can dramatically increase power usage and stress out your power supply.

Go for the tried and true Corsair and Seasonic units and go for 750 watts to give you some overhead and to allow you the ability to upgrade to SLI'ed 760s/770s in the future, which require 750 watts minimum. Bystander seems to like Antec, so that would be one to consider as well.
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