Your only crashes are from Battlefield 3?
Check on a gamer site to see if it is a known problem with W8.
With that much RAM I would check it to see if it is causing issues.
You need to run a minimum of 7 full passes with memtest86+.
RAM - Test with Memtest86+
Might be easier to remove two RAM cards and test with 16GB RAM. Re-create the crash scenario with Battlefield 3.
Can you download CPUZ and post a snip of the CPU, Mainboard, Memory, and SPD tabs.
For posting the information , enter 'Snipping tool' in the Start button > Search box, hit enter. Select the area you want to post and save to a convenient place.
How to Post a Screenshot in Seven Forums
Go to your BIOS and tell us what the CPU, RAM and the CPU integrated memory controller voltages are.
The SFC /SCANNOW errors are indicating there is a problem somewhere.
The previous crash is exactly the same as above.
STOP 0x0000001E: KMODE_EXCEPTION_NOT_HANDLED
Usual causes: Device driver, hardware, System service, compatibility, Remote control programs, memory, BIOS
READ_ADDRESS: GetPointerFromAddress: unable to read from fffff801bc5d3168
GetUlongFromAddress: unable to read from fffff801bc5d31f8
000000000000002c Nonpaged pool
EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at 0x%08lx referenced memory at 0x%08lx. The memory could not be %s.
PROCESS_NAME: Sierra2.GPU.ex - driver for Corsair H100i Link
You may need to remove the Corsair Link driver and software to see if there is any affect.
Un-install all Asus utilities, they are known to cause instability.
AsUpIO.sys Aug 03 2010 - out of date - ASUS hardware monitoring software related
ASUSFILTER.sys Sep 20 2011 - out of date - ASUS USB Hub filter driver
Check these drivers for updates or remove associated program.
pnarp.sys Jun 06 2009 - out of date - Pure Networks, Inc. Network Magic Address Resolution Protocol Driver
pnpcap.sys Oct 28 2008 - out of date -
purendis.sys Sat Jun 06 12:32:06 2009 - out of date - Pure Networks, Inc. Network Magic NDIS Relay Driver
rikvm_38F51D56.sys Oct 29 2010 - out of date - Unknown driver, possibly dynamic as it doesn't appear in MSINFO32, Maybe associated with Cyberlink Power DVD
snapman.sys Mar 09 2011 - out of date - Acronis True Image Snapshot Manager driver also included in Seagate DiscWizard
timntr.sys Jul 30 2010 - same as above
vsflt53.sys Apr 12 2011 - same as above
WinRing0x64.sys Jul 26 2008 - old driver - many different programs that center around the using of the WinRing libraries (RealTemp, Corsair Link2 (known BSOD issues w/Win8), Razer GameBooster, etc)
Carrona Driver Reference
WmBEnum.sys Apr 28 2010 - old driver - Logitech WingMan Virtual Bus Enumerator Driver
WmFilter.sys Apr 28 2010 - old driver - Logitech WingMan Hid Filter
WmXlCore.sys Apr 28 2010 - old driver - Logitech WingMan Translation Driver