My pi runs at:
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Hynix RAM. Seems stable for 4 days although only the CPU is working at 100% (tring to mine some bitcoins
I originally had mine running @ 900 w/no overvolt... tried 950 but it hung during boot, so I just backed down to the known good 900... (raspbian BTW)
...and yes RAM will matter for OC as the three options all overclock everything and some RAM just won't be able to handle it... I don't know what the exact specs of the RAM used but I'll bet the Hynix was bare minimum reqs while the cheapest samsung RAM might've been higher specced(just guessing but it seems likely if non-samsung RAM is failing in OC more often...)
I'd be careful of the SDRAM OV, as it might set the warranty bit(?), but you could try lowering core and/or sdram freqs... might help..
OTOH when I tried the late July alpha RISC OS image, it wouldn't boot @ 900, and so I dumped down to 800(w/o trying anything in between as I wasn't sure if RISC OS just wasnt going to work at anything other stock) which did work...
(I tried the latest RISC OS image(nice mouse droppings gone) but I messed up the screen res somehow so I'm going to reburn the image and this time I'll try a mild overclock again...)