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[Official] Gigabyte GA-990FXA-Series Owners Thread/Club - Page 36

post #351 of 12377
Quote:
Originally Posted by Lostintyme View Post
I just did a test on my X3, 1.45v. Getting 1.49V idle. This isn't any design, is it? This is just something wrong is what I'm thinking.

I'm thinking about keeping the board and maybe selling it when BD comes out depending on what's up if vDroop is intended or not.

Anyway, is it normal I can't get 3.5GHZ on a 2.8GHZ CPU at 1.5v on this board?
That might just be your CPU limit. Have u hit 3.5GHZ using a different board? I had a 720 and i couldnt get it stable at 3.5ghz even at 1.55v.
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post #352 of 12377
have you never used a beta BIOs before?

IDk set 1.475v and get 1.45v load isn't bad in my book. Remember idle voltage means nothing.

The only reason that LLC isn't as dangerous as it was for pre-P55 systems is becuase the quality of the VRMs has greatly increased.
Edited by Sin0822 - 6/29/11 at 5:16pm
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post #353 of 12377
It does not make sense to me to have to set a higher voltage in the BIOS to achieve the voltage I want.
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post #354 of 12377
thats how we do it on Intel, and that is really how things are supposed to work.

They don't use linear regulators to power the CPu, they use a switching mode power supply with constant error correction.

your PSu isn't exactly 12v on the 12v rail, nor 5v on the 5v rail, nor 3.3v on the 3.3v rail. Voltage is supposed to drop under load. But on AMD now it seems you guys expect constant voltages, its crazy, when a guy comes into the Intel section and posts why isn;t my voltage exactly 1.525 i set 1.525, people laugh.
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post #355 of 12377
Like I said though, with the amount of people that must have contacted Gigabyte about this, they surely would have come out and said this is how they designed it. They've released two beta's in the last few days which has given minimal improvements. Ok if voltage is supposed to drop under load, the CPU still has a minimum voltage requirement to operate under full load. So I have to set a much higher voltage to ensure that when under load the CPU receives sufficient voltage to operate with stability. And when idle, the CPU is getting even more voltage than the already higher voltage I've set in the BIOS to account for the vdroop! Sorry, still doesn't make any sense to me
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post #356 of 12377
Quote:
Originally Posted by Sin0822 View Post
thats how we do it on Intel, and that is really how things are supposed to work.

They don't use linear regulators to power the CPu, they use a switching mode power supply with constant error correction.

your PSu isn't exactly 12v on the 12v rail, nor 5v on the 5v rail, nor 3.3v on the 3.3v rail. Voltage is supposed to drop under load. But on AMD now it seems you guys expect constant voltages, its crazy, when a guy comes into the Intel section and posts why isn;t my voltage exactly 1.525 i set 1.525, people laugh.

I dont expect to see 1.525V if i set it @ 1.525V in BIOS, but I dont like to see 0.100V Vdrop under load.
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post #357 of 12377
um for what i gather you set 1.500 and you get what 1.54v idle and 1.475 load? thats a 25mv drop under load from what you set, not idle but what you set, and to be honest idle doesn't matter your not going to kill your CPU becuase idle voltage is 40mv higher than what is set. Imagine the transient spikes under load.

Has anyone measured with a DMM?

This problem intrigues me enough that Ill pull out my UD7 tomorrow with this 1100T i have and test it out with hardware and software. if it really is doing what you say it is ill make a note of it and show you guys.

Its ok though guys, just set a higher voltage for now, see it just doesn't make sense to me that they would introduce a problem that hadn't existed on their previous boards they aren't going to introduce one now unless its part of the design.

BTW who contacted who at GB?

i sent this thread over to my friend that works there anyways.
Edited by Sin0822 - 6/29/11 at 6:22pm
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post #358 of 12377
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post #359 of 12377
thank you well then yea he should have told the people who should be told about this issue.
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post #360 of 12377
there seems to be so many conflicting ideas on this around here.
from page 13 on...

http://www.overclock.net/amd-motherb...n-list-13.html

I dont know what to think now
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