Diablo showed very very few hardware errors (according to the forums, it was low .. less than 3 in 1000 for any card, and in some one case only 1 in ~2000)
Hardware errors? Any hardware error means you've pushed the boundaries of either: voltage, clock speed, or heat... Reduce one
No it doesn't. Go read carefully. Hardware checks are turned off intentionally by Diablo (and I believe all GPU mining software)
I'll cut you off there. You cannot shut off error correction via OpenCL, not that there is any to actually shut off.
The only thing I shut off is HW error message spamming when BFI_INT is on (because BFI_INT is a large hack and certain usages confuse the driver). HW error checking is still enabled in the miner, and the counter still ticks up.