Quote Originally Posted by gabe View Post
Next we are testing ultra extreme setup with dedicated (2) MCR320 & (6) RDM1225S & (2) MCP655's in series. We'll note the temps first, and depending on how much drop in temp we get, we'll see how much more of a stable overclock we can get. So far our 890 is the highest on record on water, isn't it? we were unstable at 897, and full crash at 900. So we dropped to 890 which seems fully stable after 1 hour of Furmak xtreme..
Might be just that particular card? I've seen EternalFantasy's GTX480 w/EK block go up to 900 with less core volt bump @1100mV and slighter higher temps at 54C.

Another explanation might be that the VRegs are not getting as cool as they could be since it's cooled by heatpipe?

Give another card a try I guess with the same setup.