Well, I did some unusual tests for DRx registers & found interesting Facts;
In Intel's manuals I not found explanation, very can be - because of my Inglese.
So help me, guys

This fact is about instruction-tape DRx-breaking,
when flag for appropriate DRx in DR7 is NOT set,
but debug exception is still generated.

If you have any info about this, write here.

If no, I will upload test-program & we'll test together.