Max CPU core temps for AMD Phenom II x6 1090T
The GPU should have a max of 90°C, 80°C is ok for running high settings on games.
Undefined temps on monitoring programs are difficult to find info on, they are different on each program version and each motherboard.
If I had to guess I would say TMPIN1 is your GPU.
What was the CPU core temps during the Prime95 tests?
Have you updated all your drivers from the Gigabyte support site? Gigabyte GA-890FXA-UD5
There are several recent ones.
Uninstall all of the Gigabyte utilities, these are known to cause crashes.
Your last cash was cause by gdrv.sys - Gigabyte Easy Saver - mobo power utility driver
STOP 0x000000C1: SPECIAL_POOL_DETECTED_MEMORY_CORRUPTION
Usual causes: Device driver, ?Memory
Special pool has detected memory corruption.
IMAGE_NAME: gdrv.sys - Gigabyte Easy Saver - mobo power utility driver
Another gigabyte utility driver that's out of date.
rtkio.sys Sat Jun 2 2009 - Gigabyte Smart Dual LAN - uninstall
Find a more recent version of TeamViewer
teamviewervpn.sys Thu Dec 13 17:22:09 2007 - out of date
Lets check some settings.
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 (CPU NB VID Control) voltages are.
Quick review of all your crashes seem to be blaming the graphics driver mostly, also memory and DirectX.
Uninstall your graphics driver with Programs and Features, then with Driver Sweeper.
Install an older version of the driver, you may need to do this a couple of times to find one that is stable.
Let us know if you have any questions.