Quote from: tdslot on August 20, 2013, 10:49:04 AM

Hello,

I have problem.

Who can help me?

I have mining rig hardware:

4x XFX7950 FX-795A-TDJC
ASUS SABERTOOTH 990FXR2.0 motherboard
8GB RAM
CPU AMD FX8320 8x Cores 3.51 Ghz
PSU Lepa 1600W

Software:

Windows 7 SP1 x64
AMD Radeo HD drivers 13.4 x64
AMD SDK 2.7 x64
CGMINER 3.3.1

My cgminer.conf

Code:

"api-allow" : "W:127.0.0.1",
"api-listen" : true,
"api-port" : "4028",
"expiry" : "120",
"failover-only" : true,
"hotplug" : "5",
"kernel-path" : "/usr/local/bin",
"log" : "5",
"no-submit-stale" : true,
"queue" : "1",
"rotate" : "10",
"scan-time" : "30",
"scrypt" : true,
"shares" : "0",
"auto-fan" : true,
"gpu-threads" : "1",
"gpu-dyninterval" : "7",
"gpu-engine" : "0-1025",
"gpu-fan" : "0-100",
"gpu-platform" : "0",
"gpu-memclock" : "1250",
"gpu-memdiff" : "0",
"gpu-powertune" : "0",
"gpu-vddc" : "1.087",
"intensity" : "20",
"temp-target" : "75",
"temp-overheat" : "88",
"temp-cutoff" : "95",
"temp-hysteresis" : "3",
"vectors" : "1",
"worksize" : "256",
"lookup-gap" : "2",
"shaders" : "2048",
"thread-concurrency" : "21712",
"no-pool-disable" : true

With this configuration 3x GPU cards running stable. But when I connect 4 card and run cgminer works very bad and turnoff motherboard. But PSU still running.

Who can help me with this problem? Maybe not impossible run rig with 4x GPU's? Maybe my configuration is wrong? Or I forget something to install?

Than you in advance,

TDS

Your motherboard can't deliver enough current. Get pci-e risers with power connectors to connect directly to the PSU.