bad ram

I've been testing my inventory of 1MB RAM SIMMs using my Mac SE Reloaded machine, and with one particular set of SIMMs, I get a Sad Mac at cold boot showing these 2 lines: 00000004 <— "Bank A" 00004000 <— Failed bits... AABBCCDD AA = bits 31-24 BB = bits 23-16 CC = bits 15-8 DD = bits 7-0...