GPU makes weird noice then reboots my computer

[codyt9x]

I have 2 ati 4870s in my PC, everytime I would run a game, after about 5-10 minutes I would hear my gpu fan start making a really loud noise, and within seconds my PC just shuts off, restarts itself but with no video input. I started to think it was maybe the gpu overheating, but when I looked at CCC (Catalyst Control Center) the entire time, it stays between 47-50c, which is normal for my cards. Any idea what the problem/solution is?

 

[evongugg]

Welcome to the forums!

Do you have all the power connectors on the board and on the cards connected?
Sounds like it is not getting enough power.

 

[outlw6669]

Yes, this sounds like it could be a power issue.
Please post your fully system specs including the powersupply brand, wattage and +12v amperage.

 

[evongugg]

Do you havbe a 600W PSU?

ATI Radeon HD 4870 System Requirements

500 Watt or greater power supply with two 75W 6-pin PCI Express® power connectors recommended (600 Watt and four 6-pin connectors for ATI CrossFireX™ technology in dual mode)
Certified power supplies are recommended. Refer to http://ati.amd.com/certifiedPSU for a list of Certified products.

http://ati.amd.com/products/radeonhd4800/requirements.html

 

[Onus]

Yes, please post your specs. Your PSU may not be up to the task.

 

[codyt9x]

thanks for the welcoming, yes, each video card has 2 power connectors going in which are connected from my 550w power supply. im guessing it would help to have a 600w psu for the two of them but still ive seen it shut off with only one card in it, granted i was able to play for a longer duration before it happened

 

[codyt9x]

I was looking at the wiring, one gpu has its own 6 pin cable that splits at the end running from the PCI-6p slot on the power supply to my gpu 1. Unfortunately theres only one PCI-6p slot on my power supply, my gpu 2 however is being run from cables powering up the rest of my system, such as motherboard, hardrive, slave hardrive, dvd rom. So I'm thinking maybe thats overwhelming the psu?

 

[outlw6669]

Yes, your PSU is most likely being overwhelmed by your crossfired 4870's.
Could you post the +12v amperage, brand and overall wattage of your PSU?
It should be located on a sticker on the side of the PSU.
Assuming you do need a better PSU, look into a QUALITY 600w+ Corsair, PCP&C, Seasonic, Enermax or Antec Earthwatts PSU.