Mobo whine when c3/c6 state support disable

izit · 8 Mar 2011 at 20:37

Hi. I bought the gigabyte ph67-ud-b3 today and when I booted up it whined badly from around CPU socket. Strangely it didn't do it in windows xp but did in windows7.
I found that disabling 'c3/c6 state support' in BIOS fixed it (c1e haltstate did nothing so I left that on).

Am I at a disadvantage with c3/c6 state support disabled? I heard sandy bridge turbo boost doesn't work or something and would it use loads of power with it off?
If anyone knows anything i'd love to hear as I might RMA it.

sadbuttrue · 8 Mar 2011 at 20:44

This is a common problem that affected pretty much every P55 board too. I guess the issue has yet to be addressed. Some boards are worse than others, but it's all rather pot luck.

Turbo boost will need those states enabled. Disabling power saving modes actually provides for a more responsive system, as it's not constantly changing clock speed. Of course, you'll probably want to overclock to offset the loss of turboboost.

izit · 8 Mar 2011 at 21:39

Would you put up with c3/c6 disabled (i can't OC on my H version btw) or send it back as faulty and hope the next one doesn't do it?

sadbuttrue · 8 Mar 2011 at 22:10

A replacement of the same board will more than likely have the same whine. Whether this can be considered a fault is somewhat of a grey area imo. You'll be losing a good 12% performance in single thread scenarios by disabling c3/c6 and not overclocking. I guess it depends how much of a problem the whine is to you.

izit · 8 Mar 2011 at 22:33

Whines unbearable, i can't seem to find any other work around. apart from that fact on windows XP it makes no noise.
Any ideas why that might be on W7 and not XP? Must be something else I can do within windows 7

ps. CPU wattage I recorded was 7watt idle, 33 load (disabled c3/c6) and
3 idle, 28 load (with)
Gigabyte power saver took it down a lot more whatever that does.
Thx