I ran the test for around 25 minutes everything seemed fine. I have also benchmarked/stress tested with 3Dmark 11/Prime95 and they also ran without issues. Results for the Heaven Benchmark are below.

FPS:
36.4

Score:
917

Min FPS:
18.9

Max FPS:
84.7

System

Platform:
Windows 7 (build 7601, Service Pack 1) 64bit

CPU model:
Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz (3665MHz) x4

GPU model:
AMD Radeon HD 7900 Series 13.250.18.0 (3072MB) x1

Settings

Render:
Direct3D11

Mode:
1920x1080 8xAA fullscreen

Preset
Custom

Quality
High

Tessellation:
Extreme

Yeah I have seen a few forums with people having the same problems.

If you do RMA your card, and you get a new one and the problem remains the same. Then that will confirm that the problem must be Arma 3 not working with these ATI cards.

I still have hopes that Arma 3 will get a new optimization patch that will fix this. Only time will tell.

Yes, I have overclocked my CPU from 2.6ghz to 3.6ghz (with Noctua NH-D14 cooler) and my RAM from 1333mhz to 1580mhz (rated at 1600mhz).

I only have .rpt files. I did a search for .bidmp files within my whole computer and none were found.

By the way I really appreciate the effort and response time from you guys.

I deleted all the old .rpt files then opened the game, changed the FSAA to x4 and ATOC settings to All trees/Grass.

Loaded a showcase and then the game froze with a plain blue screen. Hard reset was the only way out.

Checked the folder for new .rpt files and only one was found.

I used 7zip, I hope this can work for you. Otherwise I'll get WinRAR if I have to.