IntelBurnTest - The new stress-testing program

[vannguyen0]

System:
Intel Q9550 [3.4ghz (400x8.5) @ 1.264v]
DFI X48-T2R
8GB [4x2GB] G.Skill DDR2 [960 @ 2.1v]
Thermaltake Toughpower 850W
EVGA GTX 280 SSC

I was able to prime95 for 8hrs. Using IntelBurnTest, if I set the stress level to low (1/4 of memory) - it passed (50 passed). If I set the stress level to anything higher than 1/2 of memory, it failed (1 passed/4 failed). I set everything back to defaults. If I set the stress level to 1/2 of memory, it passed (5 passed). But if I set the stress level to Maximum stress level, it failed (1 passed/4 failed).

What does this mean?