weird bios option on IP35?

James J · 31 Dec 2007 at 19:30

Noticed a CPU to something voltage which is only a percentage and defaults to 63% but I can change it down to 61.5% or 67%. What does it actually do?

WJA96 · 31 Dec 2007 at 19:42

How about a bit more detail? I think I know what it is, but I'd like to be sure.

James J · 31 Dec 2007 at 19:49

I'll confirm it when my crysis demo finishes downloading hehe

James J · 31 Dec 2007 at 20:01

CPU GTLREF 63%

Also what is CPU VTT?

ive got an E2180 and want to find out its default voltage + what i need this CPU GTLREF thing on. Also does it affect stability of using 4 dimms? (as i have problems using all 4 but fine with 3 lol) same with VTT?

WJA96 · 31 Dec 2007 at 20:22

James J said:
CPU GTLREF 63%

That's the fsb signal overshoot margin - and you're still none the wiser. No-one has yet been able to tell me what this does I'm afraid. It doesn't seem to make a whit of difference how it's set.

Also what is CPU VTT?

System Bus Input Supply Voltage or CPU Termination Voltage which is the voltage being applied to generate the FSB signal. As you're unlikely to be running high FSBs I would think you can probably leave it set quite low.

James J said:
ive got an E2180 and want to find out its default voltage + what i need this CPU GTLREF thing on. Also does it affect stability of using 4 dimms? (as i have problems using all 4 but fine with 3 lol) same with VTT?

Well, that sounds like duff RAM or you need to increase the Northbridge voltage.

BUFF · 1 Jan 2008 at 00:59

http://www.thetechrepository.com/showthread.php?t=87

http://www.anandtech.com/mb/showdoc.aspx?i=3129&p=14

only really seems to have some use with quads.