A few things, your temps are a bit high, you mentioned you were running Prime 95 so I understand the higher temp. Your temperature could be causing the problems but if you can run prime95 stable for an hour or two without issue, I would say your cpu and most likely RAM are ok. You could try running memtest86+ for 3-4 passes (typically takes about 2-3 hours) just to verify your RAM has no errors. You can get memtest86+ here: http://www.memtest.org/#downcode
Next, I noticed you have an HP mainboard which was made during the "great capacitor plague era", you may have bulging or blown capacitors on your board which could be causing the problem. I would recommend you check for blown or bulging capacitors on your mainboard and video card as a first step, compare your caps to those in these images:
Side note: gaming often uses more power than rendering with rendering typically only maxing one component. Do you know if your video card is being used in the rendering process? In most cases with older hardware, your CPU is harnessed for rendering video, not the video card. Some GPU's can be used in adobe for rendering, you have a firepro card so you may be capable of offloading that task to the video card.
It could be a power related problem while gaming, or, you may have a failing video card, or problems with the built in memory (vRAM). If your video card has a problem, replacement would be the only option. You could try testing your video card alone by running furmark: http://www.ozone3d.net/benchmarks/fur/
If Furmark will run for an hour or two stable alone, your video card is probably ok. At this point, try running prime95 and furmark at the same time, this will stress both your CPU and Video card at the same time, what this will do is increase your power consumption and your temperatures. If you have a crash during these tests, you may have a power supply problem or temperature problem that only arises while stressing both of these components at the same time as gaming will do.
Edited by zingo156, 11 January 2017 - 03:50 PM.