intel fan control

[ratdude747]

this is boggling my mind... some experimenting has shown some oddities about my intel dp35dp:

- it has two different fan control circuits. out of 4 fan connections, two are 4 pin and pwm controlled, and two are 3 pin non pwm. but the non pwm is also controlled:
- the non pwm circuit is a real kludge job. it has 2 settings- 5v and 12v. what makes it a kludge is that under normal booting temps it gets stuck between and the fans are constantly changing speeds at about a 1hz frequency... the fans don't seem to like it as they make a weird buzzing noise in addition to the speed change sound. very annoying.
-my multimeter tells me it seem to be changing it by way of the ground since fan+ to ground (on a molex connector) is a constant 12v, but fan+ to fan- gets the 1hz 5 to 12v fluctuation.
-I checked, it is not the psu putting out that much ripple.
-they were also kind enough to not include any tachometer sence that lm sensors under linux can detect... all lm sensors can detect is the cpu's temp sensor.

sounds like to only way to get rid of the fan noise is to find a pwm 90mm fan for the back... the cpu cooler is already pwm.

[c_hegge]

Re: intel fan control

I've found that too with a similar board. The fan constantly seemed to change speed. IIRC, there was some fan detection setting in the BIOS which fixed it.

[ratdude747]

Re: intel fan control

my choice was constant change or full blast, which for the fan in there now, is bad.

[c_hegge]

Re: intel fan control

You could build yourself one of these. That's what I use on my CPU cooler. Even lets you adjust the target temperature. Only catch is, the taco apparently doesn't work.

Fan RPM monitoring will NOT work with this temperature control. Don't try to connect the rpm signal wire to your motherboard. It will not work and might damage your motherboard.

[ratdude747]

Re: intel fan control

the pwm does a fine job... i think i will get a pwm fan...

[PCBONEZ]

Re: intel fan control


1.13.2.2

http://www.intel.com/support/motherb.../cs-012074.htm

.

[ratdude747]

Re: intel fan control

link #1:

I missed that when reading the manual... i will have to check the lm sensors site to see if my chipset is supported... odd that it did a no-show...

edit- not supported... not going to billy-bob gates to get the sensing...

link #2:

whats the point? putting a non pwm fan on the pwm connector gives it full blast (i tried it). not the goal. my point was that i have seen better non-pwm based fan controls... my asus a8n32-sli had no pwm and it was better than 2 speeds...

i will buy a pwm fan for the back then...

[PCBONEZ]

Re: intel fan control

The point for #2 is that's how [I think] you did it but the manual says that isn't what you have.
.
On yours the 3-pin headers are controlled by [slaved to] whatever is on the 4-pin.
.
Meaning ultimately the tachs on the 4-pin tells the 3-pin how fast to go.
[The 3-pin don't have their -own- tach inputs to mobo fan controller.]
- Or at least that's how I read it.
.

[ratdude747]

Re: intel fan control

odd... the fan speed of the cpu fan is constant... what i forgot to mention is sometimes it would pulse from 12v to 5v, and sometimes it would stay on 5v but make the fan buzz in an uber-annoying fashion.

still sounds like the fix is a pwm back fan since the only fans connected are a back fan and a cpu fan... the board and case are not meant to OC... but with a nice cooler, my hope is for it to be pretty quiet:

the *new* goal of the computer is to have a solid platform that kinda looks like a mac and has some of the benefits of a mac but not a mac. once i get my new parts (including the fan) for the unit, it will have all the desired features:

- decent power (PDC for now, c2Q if i ever find one cheap)
- quiet
- good but not ricer looks
- good AV (built in HD audio, decent graphics, firewire, and has a tv tuner)
- expandable (has a max of 12 usb ports, 1 pcie 16x, 3 pcie 1x, 3 pci)
- solid quality

[weirdlookinguy]

Re: intel fan control

What type of TV tuner are you looking for? HD or standard def? If you are not interested in HD, I have a standard def tuner laying around that you can have. PM me if interested.

[ratdude747]

Re: intel fan control

already have one. it is an analog standard def pci tuner... i assume yours is analog as well.

what it still needs:

2 SATA optical drives
1 SATA hard drive
90mm pwm rear fan
more RAM
new front card reader

what I already have:

PDC cpu
intel dp35dp mainboard
1gb ddr2 667mhz (not much in 64 bit mode)
powermac g4 styled case
pwm cpu cooler
tv tuner
power supply
ls120 drive

[seanc]

Re: intel fan control

Yes you need more RAM, 2GB or 3GB should do you fine.
You could put OS X on that PC

Question: what do you want 2 optical drives for? I've never understood why people have 2, unless they copy CDs a lot.

[Th3_uN1Qu3]

Re: intel fan control

You may have one that reads great but doesn't burn and one that burns but is so-so at reading. I used to run like that.

[ratdude747]

Re: intel fan control

my case has 2 specifically optical bays (it has tray doors) and i need no ide opticals to use the ls120. leaving one open to me would be disappointing. not to mention two drives help with disc copying.

my goal is 2gb ram. no osx, i have an imac g5 for that. it will run fedora x64.

[seanc]

Re: intel fan control

Ah you need to fill a gap, well that's understandable.
I have a CD drive in my work PC, unplugged and non-functional, just to fill the gap up.

Fair enough about not wanting to put OS X on it, but if you ever do, it'll kick the pants off of the G5.

[Trinite]

Re: intel fan control

Question: what do you want 2 optical drives for? I've never understood why people have 2, unless they copy CDs a lot.

Cuts down on the amount of disc swapping you have to do.

[ratdude747]

Re: intel fan control

Ah you need to fill a gap, well that's understandable.
I have a CD drive in my work PC, unplugged and non-functional, just to fill the gap up.

Fair enough about not wanting to put OS X on it, but if you ever do, it'll kick the pants off of the G5.

i know, but for what i do use osx for the g5 works. for me, osx is for what fedora can't do, not the other way around. i heard that hackintoshes that were dualbooted were hard to make work....

not so much as a gap, more of a disappointment. there was one version of my case with one of the 5.25 with the tray door and the rest removable bay covers... mine is a rarer custom edtion that has 2 bays with the doors and 2 with the plugs... the second bay having no drive would not be visible, but it would be disapointing... i like features, not missing features.