overall, I suspect your old audio driver to be the cause of the bugchecks.
I would install the update version, reboot the machine, reset the BIOS to defaults and retest for failure.
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forth bugcheck was a bad memory address used in some internal functions.
(waiting for a lock)
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third was also cause by the audio driver
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second bugcheck was caused by a null pointer used by the sound driver
RtHDMIVX.sys Mon Jun 04 22:45:14 2012. get the updated version from 8/2015. (can cause memory corruption)
first bugcheck:
081415-6406-01.dmp bugcheck in memory manager caused by svchost.exe providing a bad memory address
older drivers installed:
SAMSUNG CDMA Modem WDM. Likely a part of Samsung Kies
ssudmdm.sys Thu Jan 02 01:51:26 2014
SAMSUNG USB Composite Device Driver. Likely a part of Samsung Kies.
http://www.samsung.com/us/support/answer/ANS00043305/997388219/
ssudbus.sys Thu Jan 02 01:51:22 2014
update: Realtek HD Audio sound driver
RtHDMIVX.sys Mon Jun 04 22:45:14 2012
get the lan update and sound updated drivers:
http://www.gigabyte.us/products/product-page.aspx?pid=3894#driver
BIOS Version F3i
BIOS Starting Address Segment f000
BIOS Release Date 10/07/2014
Manufacturer Gigabyte Technology Co., Ltd.
Product 990FXA-UD3
Processor Version AMD FX(tm)-6300 Six-Core Processor
Processor Voltage 8dh - 1.3V
External Clock 200MHz
Max Speed 4300MHz
Current Speed 4300MHz