Hello All,
I have aP4 3Ghz based system with 1GB of RAM. I am noticing that when the CPU heat reaches 51C or above, the speed of the CPU Fan will drop from 2200+ down to 1300+. I assume this is not normal as it should be the other way around. I have the latest BIOS on the machine and have reapplied new silver compound to the CPU and heatsink. GigaByte seem to be giving me a really hard time understanding the problem and I requested and RMA which they have refused.

Does anyone have any suggestions/ideas?

Cheers,
Vincenzo.

I have no explanation for your fan RPMs, but it could simply be a software glitch. You're NOT overheating...not even close. Your temp is perfectly normal, in fact, it's pretty good for the "hot potato" Prescott. You should be running PC3200 RAM though

ASUS A7N8X-X
Athlon XP 1800+
8.5 x 200MHz
1024MB PC3200 2.5-3-3-7
Asus A9550GE/TD 128MB
WinME/WinXP Pro SP1

Well, it actually has reached as high as 68C with the fan RPM in the 1100's! I have used another software tool (SpeedFan) and getting almost identical results. Any reason why I should be using PC3200 RAM and not PC2700?

Thanks for the help...

Vincenzo.

You have an 800FSB CPU correct? It's bandwidth is 6400MB/sec. The RAM's throughput should equal the CPU's bandwidth. I assume you have 2 x 512MB in dual channel mode?

2 x PC2700 @ 166MHz = 5400MB/sec throughput

2 x PC3200 @ 200MHz = 6400MB/sec throughput

The PC2700 RAM is bottlenecking your system.

ASUS A7N8X-X
Athlon XP 1800+
8.5 x 200MHz
1024MB PC3200 2.5-3-3-7
Asus A9550GE/TD 128MB
WinME/WinXP Pro SP1

WOW!!! How did you know all that?!?! You are spot on. BTW, I am also hyperthreading.

But do I really need to change the RAM to fix my CPU fan speed issue? I may certainly look into swapping out the RAM for the additional performance but my biggest problem, is the FAN not speeding up properly in proportion to the CPU heat being recorded.

Thanks again...

if they refuse to allow a return, I would imagine a warranty isn't much of an issue? In that case why not just buy a new heatsink and see if it really is the heatsink thats causing the problem (or the software reading incorrectly) if it isn't the heatsink then it should be easy enough to return for a refund (since its easily testable in the 30 day money back garentee from newegg). its a long shot but you said you've used speed fan possibly make sure your monitoring the correct fan? (in my case its fan #2 since fan 1 is my motherboard fan and fan 3 is a ventalation fan out the back side running at about 2500rpm. Which is a very low speed to be running at and if your processor fan is dropping below....)

Windows Xp Pro X64
AMD Sempron 64 3000+
768mb Ram Pc 2700
Radeon X300
Nforce 4 Motherboard
Realtek AC97 Sound

Unfortunately, I bought the motherboard about three months ago (not from Newegg) and have only started noticing this issue especially since my PC had been blue screening fairly often during the last two weeks. I am using Corsair XMS RAM PC2700 and was advised to apply an addition 0.02V to the RAM which solved my system reboots. However, I then noticed the fan misbehaving which I have to believe is being caused by the motherboard. I am definetly looking at the correct FAN speed as I am only monitoring two fans and one being controlled manualy on my Thermaltake 480W power supply.

Just to add some more information, my current idle temp is 39C and fan speed at 1854 which I guess is good. As soon as I run anti-spyware to scan my system or a registry cleaning tool, I get up to 62C with a fan speed of 1350. Again, was able to verify this using two different CPU and Fan monitoring tools.

well the way I see it you have narrowed it down to 2 suspects, either your motherboard or cpu fan. If you had some way to change them out and see whats on the fritz then that would make this all a sinch, but it doesn't sound like you do.

In my case when I built my pc for the life of me I couldn't find out why it wouldn't boot period, so I had to change every piece of equiptment out (power supply, hard drive, ect) only to find out they all functioned properly. After basically pulling out my hair and basically giving up, I found out that the no power came from the wiring to my power button (on the case) coming loose during shipping was the problem (so simple but it didn't even occur to me).

I wont even give my best guess because I don't want to give out any wrong info, but I'm sure others around will be more knowledgable as to what it "sounds like" is the culprit in your situation.

Windows Xp Home
Celeron 2.8 Ghz
768mb Ram
Geforce 5700LE PCI Card 128MB 128 bit

Thanks for your feedback. I have shipped the motherboard
back to GigaByte in the hope that I get a replacement as I am
sure they probably won't reproduce the problem back at their
HQ.

I have also discovered that the +5V was registering very low
anywhere between 2.7v - 4.8v and was told from
Thermaltake to RMA the PS also! They didn't think that this
had anything to do with the fan speed issue but never the
less, I am not taking any chances!

Just wondering i have an old packard bell and waz wondering if there was any software that could speed up the power suply fan?

thanks

please i need this info a.s.a.p thanks

Well, I finally got a replacement motherboard from Gigabyte and still the same problem. As soon as my CPU temp hits 51C the heat sink fan (stock) slows down to 1100-1300rpm from around 2200rpm.

Any ideas anyone? I can't believe this is normal and Gigabyte's support has been piss poor in the situation to say the least. I am not sure how the conduct their motherboard testing but three weeks into my RMA, they notify me that they don't have a CPU to test with!!!! Stay well clear from Gigabyte motherboards by friends...