Just to reinforce.   I agree with exactly what Doug wrote.

Also, these are composite SIMMs, which means that they made a large capacity SIMM out of small capacity chips.   They use more power, and draw more current from the logic board drivers.   Apple recommends against using composite SIMMs in pretty much all of their machines.  Some times they will work.  I had a set just like these in my IIci.   I sold them a long long time ago.