Memory tester for Snow Leopard Can somebody suggest a memory tester for Snow Leopard (10.8)?

Command line or other doesn't matter, ideally something that doesn't have to be installed though (doesn't change the machine) and just runs from the downloads folder or even an USB stick.
Memtest, a relatively inexpensive app @ $1.39, worked for me on several Macs recently, and I've been using it for more than a decade. Found one bad RAM carrier just last week. YMMV. Now runs in 64bit.