🚀 go-pugleaf

I'd say if it works reliably, then use it.  From what I've read, the 
various speeds of memory chips are selected by testing large batches
and then labeling the chips appropriately.  If a manufacturer needs
slow chips to sell but has only faster ones on hand, it's easy to
simply label the fast ones as being slower than they are and sell
them.

I needed four more megabytes of RAM for my 386-33 but had only 80 ns.
chips on hand (the first four megabytes was 70 ns.).  The first set
of four that I tried gave me parity errors under Windows 3.1, but
the second has worked fine for several months.

Frank Calloway