Crazy A64 Newcastle Undervolting

[jazzboy]

OK guys I seem to have been able to do some huge undervolting on my A64.

Its a Newcastle 3000+ - S754, 2.0 GHz, 512 cache, 130nm.
My mobo is an Abit KV8.

Using RMclock ive managed to lower the VID from a default 1.5 down to just 1.25 - altho due to slight overvolting from the mobo the actual vcore is about 1.30 (cpu-z & Abit EQ measured). Its prime95 stable after at least 6 hours and passes 3dmark2001 fine.

Even nicer is the temps of course. Idle 34 / Load 46 all on the stock HSF, in a budget Tsunami case. And there's also the lower power consumption which is another bonus.

Has anyone else had similar experiences doing this? It just seems weird that its perfectly stable at 1.3v and yet the default needs to be set right up to 1.5v - or do I just have a good chip?

I've not tried actual overclocking, but don't really wish to becuase the mobo has a Via K8T800 chipset which doesn't have a pci/agp lock

 

[ecvs85]

I tested my newcastle 1.8Ghz to run at 1.25v and it run without any problems (never tested stability though), but then I ran it on 1.375v which I tested to be no problems. Right now I'm running at 2167Mhz on 1.4 volts. Undervolting is sure nice

 

[Furen]

A lot of newcastles can do 1.8-2 at 1.1v (well, maybe not a lot, but some)

 

[Zap]

My A64 2800+ Newcastle runs at 2.4GHz 1.5v and underclocked/undervolted to 1.33GHz 1.1v using RMclock. I either run it over or under, never at default 1.8GHz . Since I can overclock at default, I could probably run stock speeds undervolted. In RMclock I have a 7x option for 1.86GHz that is set to 1.3v. Don't know if it actually ever runs at that speed. The auto speed setting seems to work okay under Windows, but under games I get periodic lag unless I manually set to highest multiplier in RMclock.

 

[dguy6789]

It is uncommon for a Newcastle to run at really low volts?

My current system can run at 1.15Volts at stock clocks 24 hour prime stable. My mainboard unfortunately will not go over 223HT no matter what settings I use so I cannot see how high this chip will clock.