I once ran MemTest86 (I don't know if that's the same as MemTest) for
4-5 hours with zero errors, but Gold Memory (
www.goldmemory.cz) found
errors in ten minutes (MemTest86 eventually reported the same errors).
A
www.realworldtech.com review said that both tests were good but that
Gold was better, but I've had other modules that tested fine with Gold
but failed with MemTest86, so I always test with both.
Do you mean branded modules or branded chips? Because many branded
modules, including some from Kingston, PNY, Centon, Spectek, K-byte,
Mustek, and Corsair, contain chips that lack the chip manufacturer's
normal brand markings because they're recycled or non-prime, and these
are the only kind of modules that have failed on me (Kingston, K-byte)
or couldn't be overclocked reliably at all, including Kingston (no-name
chips) and Mustek (Spectek chips, but a Spectec brand module with
Spectec chips overclocked well). Some chip brands, including Spectek,
are for recycled chips, but Elixir seems to be Nanya's brand for it's
less-supported chips, and I found them to be very overclockable, just
like PNY modules with Bravo chips, but I don't know anything about
Bravo.