Will this work on a Imac 9,1? i have a 2x2 in there i want to upgrade to 2x8. will this work on the imac 2009, 2.93GHz?

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Short answer: No
for your iMac 9,1 -
RAM Type:PC3-8500 DDR3Min. RAM 
Speed:1066 MHz
Details:Supports 1066 MHz PC3-8500 DDR3 SO-DIMMs (204-pin).
You want 204 pin SO-DIMM modules. These are 240 pin ECC modules. Apple says ECC memory is not for use in the iMac 9,1:
The maximum amount of RAM you can install in the computer is 8 GB (a 4 GB SO-DIMM in each slot).
You can use any Small-Outline dual inline memory modules (SO-DIMMS) that meets all of these criteria:
PC3-8500
Unbuffered
Nonparity
204-pin
1066 MHz
DDR3 SDRAM
You can use RAM module sizes of 1 GB, 2 GB or 4GB in each slot.

DIMMs with any of the following features are not supported in the iMac (Early 2009) computer:
Registers or buffers
PLLs
ECC
Parity
EDO RAM 
(check on apple's support site) 
I installed this memory in a Mac Pro 4,1 but have only 1333 speed memory in the slots.  It does not work mixing 1066 and 1333 speed memory.

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