Is anyone able to run an Am5x86 at 180 MHz inside a standard AT case with poor airflow, at 3.3 - 4.0 V, and not use any type of fancy cooling/refrigeration?

In summer, expect the inside of your AT case to be around 33 C after it has been running for awhile. I've been finding that benchtop testing at 180 MHz doesn't necessarily equate to the same stability conditions when placed inside a mini AT case. On the bench with room temperature around 22 C, I can get away with a standard socket 370 heatsink/fan, but once inside a case with poor airflow, the air temp rises to over 33 C and I'm needing a peltier.

Thus, I was wondering if my CPU is just not up to snuff, or if anyone's Am5x86 can survive the above specifications at full load. Ideally the CPU should be running full for an hour or so and won't crash under typical usage (Win95 games, internet use, Photoshop, Adobe Acrobat, compiling, etc). Thanks!