Here's 5 runs on 1.92:
Run 1: 456.9 3382.3
Run 2: 457.8 3373.1
Run 3: 459.8 3370.7
Run 4: 458.3 3361.7
Run 5: 458.5 3353.9
average: 458.26 3368.14
The consistent drop per run for me on multi-threaded score makes me fairly sure it's a heat related degradation.
Trying 5 runs on 1.90 now:
Run 1: 449 3340.7
Run 2: 462 3375.5
Run 3: 461.7 3369.5
Run 4: 461.3 3369.1
Run 5: 464.5 3369.1
Average: 459.7 3364.78
I'm not convinced there's much difference between versions. Just minor variation between runs.
Your runs varied by 14 single-core, 40 multi-core, mine varied by 15 single-core, 42 multi-core.