Fan control

[Sam5150]

I have a coolermaster centurion case, a 550 watt psu, I have a tornado TD8038H intake fan in the front.
I have a gtx 280 gpu exhausting to the back. My psu just sits at about 850 rpms all the time(120mm exhausting to the back). my cpu fan is a 120mm running about 1200 rpms most of the time.
My rear casefan exhaust is a 120mm rexus delta fba12G12u1BX (thats a 115 cfm at 2500 or so rpms, It is on a fan control, and bios fan control is disabled), I have exhaust in large supply.....
My casefan intake is the TD8038H,(10.8W, .9A, 81.5 cfm) at full rpms, 5800rpms.
the fan will idle at 1000 or so and get up to 2500rpms on prime95 running. cpu and board temps at about 50C.
I've tried putting a hardware fan controler on it.- It maxes at about 2500rpms.
With the bios fan control on turbo(heavy high), 2000-2500rpms most of the time.
The wholething runs pretty cool most of the time.
But,...
the gtx 280 hits 85C under heavy gaming,and sits there with everything at near top fan speeds except the front intake.
I want my GPU to run cooler.
I want the intake fan to hit 4500rpms.,noise is no problem.
The front fan is connected to a molex 12V, and signal from the mobo casefan2 3-pin.

 

[sportsfanboy]

MSI Afterburner and create a fan profile and you can overclock the card through this software as well if you choose.

 

[Sam5150]

I do use afterburner for my gpu, I mostly have the fan at 60-100% between 50 and 70C.
I don't have performance problems-I run wow and getting into rift.
I hit 60+ fps at max settings 99% of the time.
I'm happy with no OC, but have OC'd my GPU alittle and can hit 4Ghz(from 3.2)just pushing the fsb up on my cpu.
My big concern is air IN, I'd like my 5800rpm fan to turn atleast close to 5800rpms.
Maybe it is bad?, I have a multimeter and the rail is in spec.
I have not ohm'd the fan, and being it is a new fan from newegg, I should not have to
any ideas why it would turn slow at 12vdc? (slow being 2500ish rpms)

 

[sportsfanboy]

I kinda sorta sped read your post and missed some of the content,LOL. Have you tried plugging it in to the 3 pin header and turning off fan control in bios, and or have you plugged it directly into the power supply 4 pin molex?

 

[Sam5150]

I have not plugged it direct to the header because the way it is wired the neg. and the pos. are wired to a molex in/out. The remaining wire has a 3-pin to header connector with only the speed detect senser wire on it
My psu has a "fan only" molex for a fan.
I will try (after i finish writing this), to use a different (full 4-wire molex output) plug.
fan control is off in bios, so the fan "should" be running at 100%.
Maybe the "fan only" molex has a limit in amps, .9 amps is alot for a casefan?
I'll hook it up to a full molex and post the results.
Untill then, any ideas are joyfully accepted

 

[sportsfanboy]

I'm not sure how many amps a normal case fan requires, I know a little about configuration and that speed can be adjusted with different amounts of votage.

 

[Sam5150]

ok, so i directly checked the voltage on the "fan only" plug, it was 4.4v.
The other molex plugs on the rail are all 12v give or take a little...
With a regular molex connected the fan is hitting 5800rpms and sounds like a jet takeing off!, just as it should.
I'll have to get a molex voltage control "thingamajigga"and hookup the fan so i don't have to run it on full all the time.
Until then, 2500 rpms is not bad.
Thank you for helping me, and if anybody has any ideas in the next six months, please share.
why would the fan only plug have 4.4ish voltage?
Can it be changed with software?
What fan is 4.5 volts?, did i miss something in my bios?

Do they make a molex voltage controler?, like pre wired...
or should i just make one?