In my opinion the best way to check memory is to completely fill the RAM disk and then empty it by deleting the contents.
If the memory is defective, it will crash when the RAM disk is filled/purged.
BTW: Dont fill the RAM disk with Hard Drive contents as we that will not definitevely identify any problems! I would suggest opening the RAM disk, then copying the contents of the Workbench disk into it, highlight them and press Amiga-C lots of times until the 64MB is filled. Then reverse the process by deleting the contents.
Your Samsung memory was checked this way on a BlizzardPPC before despatch.