Rig becomes unresponsive after few hours of mining

[xloki]

Here is my setup:

amd 145 sempron /asrock extreme 870
2x1gb kingston ram
4x 5830
700watt gold rated power supply


The rig will mine perfectly on all four cards for a few hours and then become unresponsive. I had originally thought it was a power issue and went ahead with replacing it and then the rig ran fine for awhile until it did the same exact thing. The power supply I purchased, temporarily, was a 850watt bronze rated, which should be enough juice for what I have. I then began to suspect it being a riser cable that I use for 2 out of the 4 cards. Sometimes I would boot up and it would only hash at half the rate or not see the card at all. I isolated which card it was and indeed it was one of the cards on the riser to a 1x pci-x port


It would run perfectly fine for days-weeks on 3 cards mining full blast. I got replacement riser cables and the half hash rate problem went away and all four cards were mining for approximately 12 hours. I have switched back to my original power supply but it still wont run more than half a day with all four cards going.

Is it just my power supply or can someone offer a better explanation? Any help will be greatly appreciated.

edit: I run all the cards at 960/300, which has been flawless in the past.

I have also swapped the cards around so I think all the cards are fine.

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[Turbor]

Hallelujah

[check_status]

1. You are reaching the limits of your 700 watt psu.
2. Some of those cards must be using molex to pcie adapters
3. Your are agressively overclocking your GPU's while your PSU is stressed without OC'n.
4. Molex to pcie adapters can't handle the current load like a normal pcie direct from the psu

Any cards on molex to pcie adapters should not be agressively OC'd, 800/300 to start for these cards.
Your 4 cards are in need of about 600 watts. Your power supply may be lying to you about its useful output wattage.
Look to purchase a continuous rated PSU at least 80+.
You would probably need at least a 750w continuous rated PSU and a unit with enough regular pcie adapters (no molex to pcie).

Cheers