7950 crashes but only in 1X PCIE slot

Hi,

7950 crashes within 1-4hrs when on PCIE 1X slot, showing DEAD in cgminer. Cards will run for days when all are in PCIE16X slots with PCIE16X-16X risers (unpowered). When I plug any of the cards into a PCIE1X slot they will load and has successfully but then crash and show DEAD in CGMINER within 1-4 hours. I have tried both powered 1X risers from Cablesaurus, one I modified myself to be powered, and unpowered. Tried AMD drivers 12.8 which crashed worse, and 13.4 which wasn’t worse but didn’t fix it either. Stock clocking is 925MHz GPU clock, 1250MHz Mem clock, 1.250V and they will at this stock voltage. I typically run at 1050/1650/1.075 and they crash at this setting too.

MB: MSI Z77A-G45
Proc: Intel G530
Mem: 4GB DDR3
Card1: Sapphire 7950 100352-2L 925/1250/1.250
Card2: Sapphire 7950 100352-4L 925/1250/1.250
Card3: Sapphire 7950 100352-4L 925/1250/1.250
PSU: Seasonic 850W 80plus Gold
OS: Windows 7 x64
Miner: cgminer 3.1.0
AMD Driver: 13.1 (tried 12.8, crashed worse, 13.4 same crashing)

Cgminer config:

Code:

{
"pools" : [
	{
       		"url" : "stratum+tcp://ltcmine.ru:3333",
                "user" : "user",
                "pass" : "user"	
	},
	{
		"url" : "stratum+tcp://coinotron.com:3334",
		"user" : "user",
		"pass" : "user"
        },
        {
                "url" : "stratum+tcp://stratum.give-me-ltc.com:3333",
                "user" : "user",
                "pass" : "user"
        },
        {
		"url" : "http://ltc.kattare.com:9332",
		"user" : "user",
		"pass" : "user"
	},
	{
		"url" : "stratum+tcp://spare.ozco.in:9333",
		"user" : "user",
		"pass" : "user"
	}
]
,
"intensity" : "20",
"vectors" : "1",
"worksize" : "256",
"kernel" : "scrypt",
"lookup-gap" : "0",
"thread-concurrency" : "22400",
"auto-fan" : true,
"gpu-fan" : "35-85,10-85",
"gpu-powertune" : "20",
"temp-cutoff" : "95",
"temp-overheat" : "85",
"temp-target" : "75",
"api-port" : "4028",
"expiry" : "120",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "1",
"hotplug" : "5",
"log" : "1",
"no-pool-disable" : true,
"no-submit-stale" : true,
"queue" : "1",
"scan-time" : "5",
"api-listen" : true, 
"api-network" : true, 
"api-allow" : "W:127.0.0.1", 
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}

Would love some help sorting this out. Any logs needed, I will post them. If you suggest something, I will try it.

Thanks,