Crossfire dual gpu reboot loop on z68x-ud3h-b3

[Cliften Bowers]

I just built a new rig centered around the gigabyte z68x-ud3h-b3 mobo. It runs perfect other then when I run dual gpu's. When running both the system will restart at the "Loading Operating System" startup screen. I have tried updating the firmware to the newst beta f11j but to no avail. All my setting currently are stock settings. My current specs are the mobo listed above, 2500 core i5 3.3Ghz, (2) ati Radeon hd 5770, 2x4Gb G.Skill ripjaws 2133 memory, 64Gb crucial SSD, and a 700w xigmatech power supply. If anyone has any clue on a fix or if there is a hardware issue I'm all ears.

[profJim]

Re: Crossfire dual gpu reboot loop on z68x-ud3h-b3

Is your system OK when you test each video card separately, one at a time?
When you install or remove a video card, have you unplugged your power supply from the electrical outlet?

I always unplug my power supply anytime I make hardware changes, even if I'm only installing a fan.

[Cliften Bowers]

Re: Crossfire dual gpu reboot loop on z68x-ud3h-b3

I have not unplugged my Power Supply but I do switch it off. I have tested both separately and they work fine stress test and all. I used them in my old rig without problems.

[profJim]

Re: Crossfire dual gpu reboot loop on z68x-ud3h-b3

There might be a problem with the 2nd pci-e x16 slot, try booting with only one card in that slot, and test with each card.
I've seen a few posts where the video card was damaged then they didn't unplug the power supply during installation or removal.

[Cliften Bowers]

Re: Crossfire dual gpu reboot loop on z68x-ud3h-b3

I just gave what u suggested a try and im writing this right now with the card in the second slot. It booted up just fine. So it has to be something specifically with both running at the same time. Maybe my crossfire cable somehow got messed up would be one guess i can put forward.

[Gr1pp3r]

Re: Crossfire dual gpu reboot loop on z68x-ud3h-b3

sounds like a power supply issue so far
maybe not enough or unstable supply
i know from sli experience that you need a solid power supply to feed them both

[profJim]

Re: Crossfire dual gpu reboot loop on z68x-ud3h-b3

We can best help you if you put a detailed hardware list in your forum signature, as we are often helping in many threads at the same time.
In a recent thread, one member posted that he had to gently rock the cable slightly for his video cards to work.
You might need to clean the electrical contacts with 91% pure rubbing alcohol that you can buy at a local drug store or department store.
Can you borrow another crossfire cable to test with?

[Gr1pp3r]

Re: Crossfire dual gpu reboot loop on z68x-ud3h-b3

maybe not tho if its that early in boot

not sure about crossfire as only have nvidia experience but on my x58 ud5 i dont need to have the pci strap fitted at all

[Cliften Bowers]

Re: Crossfire dual gpu reboot loop on z68x-ud3h-b3

I will do the signature alittle later. Something interesting did happen when I went to move my GPU back to the first slot. When I booted it up and it got to the "Loading Operating System" Screen it rebooted just like what happen when I had the two GPU's plugged in. After another restart it booted up just fine. It maybe something to do with the connectors like u said not being clean. I will also have to give that a try because it may not be making enough contact.

[Cliften Bowers]

Re: Crossfire dual gpu reboot loop on z68x-ud3h-b3

sounds like a power supply issue so far
maybe not enough or unstable supply
i know from sli experience that you need a solid power supply to feed them both

I am using a couple year old 700w PSU i used it in my old rig and figured I could move it to my new one considering it has more then enough watt's to power anything. I do not believe it is crossfire ready or certified but i didnt think that it had to be to function. The PSU is the same one that i used to crossfire the same two cards in my old rig. I dont know if this could be the problem but I dont mind buying a new one if need be. If i could have some suggestions for viable PSU's I would appreciate it.

[profJim]

Re: Crossfire dual gpu reboot loop on z68x-ud3h-b3

Make sure that each card is fully seated, front and back.
It's possible that the card's front metal bracket is slightly misaligned and preventing the card from properly seating.
Make sure that motherboard components under each card are not interfering with the card.
When I build a new system, I always clean the motherboard's slots, along with memory contacts and all add in cards.
I don't clean the cpu socket as it's too easy to bend the socket's pins.

[Gr1pp3r]

Re: Crossfire dual gpu reboot loop on z68x-ud3h-b3

well if it ran the same cards before then is there an extra plug on that board to help supply power to pcie slots on your new mb ?
i dont know anything about your psu but no they dont need to be certified but some power supplies are better at the stability of the power and not just reaching the stated wattage
i know on my psu the rails have different power levels so maybe check the rails
but it may be a setting on your new board or extra power plug somewhere so dont go spend yet..

[Cliften Bowers]

Re: Crossfire dual gpu reboot loop on z68x-ud3h-b3

No I wont even attempt to clean the CPU socket lol.
I have a can of Air that I will use to clean the slot's and other things tomorrow. I think the most likely cause is the connectors being dirty but I will have to get back to you on that cuz I dont think blasting off dust at 4am is to polite hahaha.

[Cliften Bowers]

Re: Crossfire dual gpu reboot loop on z68x-ud3h-b3

well if it ran the same cards before then is there an extra plug on that board to help supply power to pcie slots on your new mb ?
i dont know anything about your psu but no they dont need to be certified but some power supplies are better at the stability of the power and not just reaching the stated wattage
i know on my psu the rails have different power levels so maybe check the rails
but it may be a setting on your new board or extra power plug somewhere so dont go spend yet..

Hmmmm I think I may have something to give a try that might give me an answer to this. But I will have to go through a box of cables which is currently out of hand at the moment. I will have to get back to you later today if its not a problem

[profJim]

Re: Crossfire dual gpu reboot loop on z68x-ud3h-b3

I use a $3 automotive air compressor that I bought at Goodwill to clean out my systems, but definitely not in the early morning hours.