DDR3 uses a 1.5V SSTL I/O standard, which is very likely incompatible with anything on the Raspberry Pi (I admit I know little about Raspberry Pi) given that there doesn't seem to be anything but GPIO on the card. Most likely the Raspberry Pi uses 3.3V(or even 5V) on the GPIO which if you also powered the DDR3 with that voltage you've likely got a dead memory module.
Maybe you should have read something other than the JEDEC standard, which doesn't seem that great as a datasheet for a DDR3 module.
Besides that unless you designed a hardware DDR3 controller (e.g. in an FPGA) you're most likely never going to get it working via GPIO of a processor.
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Just checked the GPIO are 3.3v so you have at a minimum damaged the SSTL I/O of the DDR3, so it's likely the parts will never work.