Well, now thats a tough one. I think it was "stable" at 265x9 (2.5,3,3,8) in everything but F@H. It took a while to early unit end. Thing with F@H is, it takes days to weeks to figure what is really stable.everybody else here might says its stable at something else much higher. I think its the best indicator of "stable" (even though its a pain in the arse) Right now I am OK, (only ended one unit early in 3 days) at cas 3,4,4,10, 2.8v. But by all other inticators I have had it stable at 257x9 at 2.5,3,3,8, 2.6v.