You need to verify that the second slot isn't a math coprocessor slot. Some of the early 486-sx machines had math co-processor sockets because the sx doesn't have one built-in. If indeed it is two actual cpu sockets, then yes, the chips must be the same manufacturer, and they should be the same speed. You can probably get away with putting a 66 in if the first one is a 33, since physically there is no difference between these two chips. The machine should just run at the slower 33 mhz speed. I have a motherboard here that I had a 486-33 SX chip in, replaced it with a dx2-66, and it ran like a champ, no need to change anything on the board. Likely yours is the same. Typically intel chips are preferred for most dual-processor boards, though some of them have jumpers to dell it what kind you have (intel, zeon, cyrix, amd, ...) The boards I've seen and the 2 that I have both take intels, though the one can be jumpered to accept other chips, but I can't find the manual, so have no idea how to tell it I've put zeon processors in it, so it refused to behave. <sigh> Ah well, some day I'll get it to work, the other one with 2 intel chips (486-25) is working just fine though. Hope this helps.
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