iFixit iMac Intel 27" Mid 2010 Dual Hard Drive Kit Brand_Cleanwirth then you can still use

then you can still use this hub

5V Technology DDR3L Error Correction ECC Signal Processing Registered Form Factor 240-pin RDIMM Ranks Quad rank Configuration x4 Pieces in Kit 1 Compatibility

Below is a general guide but for more specific compatibility information see our monster M

Supports USB 1

M393B5170FH0-YH9 Capacity 4GB (1x 4GB) Brand Samsung Speed DDR3L-1333 - 1333MT/s - PC3L-10600 Voltage 1

iFixit iMac Intel 27" Mid 2010 Dual Hard Drive Kit Brand_Cleanwirth then you can still useiFixit iMac Intel 27" Mid 2010 Dual Hard Drive Kit Key Specifications Form Factor: Dual Hard Drive Kit Warranty: 12 months Condition: New Hack a second Hard Drive into your 27" iMac The complete kit includes all the tools and cables you need to install a second drive. Just add an iMac and new hard drive or SSD of your choice. Compatible with all processor speeds, regardless of whether or not Apple offers the additional SSD option for your machine.