No it doesn't. Go read carefully. there are always going to be occasional hardware errors for this kind of thing
All this writing and all I really said is that hardware errors are normal and does occur with ALL GPUs.
I'm sorry Veldy but you're incorrect
GDDR5 does have error correction however, which is why you can push it past its boundaries and not crash, but will get reduced performance from all the error-corrections.
Aside from GDDR5 and specific ECC ram, any hardware error would cause huge problems up to and including system lockup. Later operating systems (Win7 in my case) have gotten better at coping though, if you're lucky you get a "Display Driver has Stopped Working" error and not a hard-freeze.
Edit: I'll just edit this post in response to the one below to avoid spamming this thread with offtopic posts to say that we'll just agree to disagree
Consumer GPUs do not use ECC-enabled GDDR5.
The HW errors, however, are caused by naturally unstable hardware. On normal Radeons at stock clocks and voltages, and are not overheating, have a known error rate (which is something like 1 error per several hundred million instructions), and do not have excessive (or really, any) internal checks.
This is not a defect in the hardware. GPUs are for playing video games. Scientific apps that are searching for a needle in a haystack (such as what we do) double check the result.