4 gig of RAM.
Just upgraded my mac, have 2 sticks of 2gig of RAM hynix (generic factory supplied RAM for Apple) 1333 mHz, DDR3. Working order.
PM me, $40 or a carton of Coopers Mild Ale (usually $35 a carton.)

Hi Murley,
Hynix
it's the specs for the serial ending fr8c
which then needs to compare with
iMac (21.5 and 27-inch, Mid 2010) - Technical Specifications
essentially it looks right:
4GB (two 2GB SO-DIMMs) of 1333MHz DDR3 SDRAM
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