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Silent CPU and System fans for HTPC? - Page 2

post #11 of 15
Looks to me like you need a psu that exhausts. Are you sure you are correct on your drawing? Every gpu I have/had blew onto the gpu and not pulled across.
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post #12 of 15
Thread Starter 
Quote:
Originally Posted by hick View Post
Looks to me like you need a psu that exhausts. Are you sure you are correct on your drawing? Every gpu I have/had blew onto the gpu and not pulled across.
Your right it sucks air onto the GPU, my bad.

What I did.
  • Removed 1 HD3870. Its a single setup now.
  • Put 480watts psu inside. ( It exhausts so blows hot air in from the cpu and blow it out the case) And put the 750 in my own desktop.
  • Checked the 120mm for intake Air.( It was reversed it acted as an exhaust )
  • Changed mobo to ep45-ds3l. Put x48-dq6 in own system.
  • Changed the thermalgrease with a fresh new layer. Cleaned it nicely with some nailpolish remover wait for it to dry, then reapplied t he thermalgrease on to the processor.
  • Changed zalman cooler to stock intel cooler, put zalman in own system

Im reading 33c on boot from bios climbing to a 51c Idling . 51c In bios is not normal ........( I think)

What I'm planning to do:
  1. Get a Scythe BIG Shuriken
  2. 2x60mm silent fans running at 7v or 5v.( How the hell do I cut the molexes nicely? or pull out the pins )

What still questions me?:
  • Will it do any good with the 51c idling in bios getting the new coolers? Or is this CPU going to meltdown.
  • Will placing the 3.5inch hdd underneath the bluray drive in a 5.25inch to 3.5inch adapter rack make any airflow difference for the 120mm fan?

Edited by m1nd - 2/13/11 at 4:21pm
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post #13 of 15
Sounds like you're on the right track.

The CPU temp at boot up in the bios at 33 seems a bit high. Unless the ambient temp is 90*F, the temp sensor on the processor may be quite a bit off, giving you higher temp readings than what they actually are. Those sensors are known to be very inaccurate. I've had CPU's reporting 10*C differences within the processor itself!

I don't think moving the HDD will show any great improvement.

What I mean about blocking off the area under the 5.25" drive:
Think about where the 120 gets it's air from... you have to analyze both sides of the fan, not just where it's blowing the air to, but where it gets the air from. Like most things in life, the air will follow the path of least resistance. It will draw all of it's air from within the front bezel. Looking at your pictures, that air can come from only 2 places, the vents designed for that intake air on the bottom edge of the front bezel, or it will draw it from the large opening that leads back into the case below the 5.25" drive. It looks to me like the path of least resistance is from the opening below the 5.25 drive. Block that opening, and the intake air will be forced to come from outside of the case through the vents in the bottom edge of the bezel.

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post #14 of 15
Thread Starter 
I tried cutting out a cardboard and placing it beneath the 5.25 bluray to coverup the remaining slots.

I made some pictures of the cases position and case open and closed temps.
The caseopen was when i first fired up the system. 5minutes later the temperatures were at 46c and adding. I added the cover and placed the case where it should normally be. I waited 15minutes. The system temperature rose to 42c and the cpu temp was at 59c.

The pictures:









The cardboard underneath the bluray drive


Placement of the case


Temperatures after 15minutes idling in bios


IM ALL OUT OF IDEAS!
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post #15 of 15
That should work... to further the cooling performance in a closed off space like that, try out blocking all of the case vents (just use some masking tape) on the top and sides of the case - you want the air to flow in from the front and out through the PSU and 60mm fan slots over the mobo. I am thinking the extra vents on the sides/top of the case are just letting hot air circulate around and not flow through/out (you want air going from the front of the entertainment center to out behind it).

Also, the BIOS is just reporting one of the CPU temps. Download speedfan (http://www.almico.com/speedfan442.exe) - you should see 2 CPU temps - are they same/similar or is one higher than the other? The temp discrepancy I've noticed (as mentioned in previous post) and heard other stories of, is on 775 quad CPU's, and I have a strong suspicion your temp readings may be erroneous. If your results are inconclusive, buy/borrow a infrared temp gun and take some actual readings off the heatsinks and do some sensor vs. actual heatsink temp research and see what you come up with.

I hope this helps - sorry I don't have a cut and dried answer for you.
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Smalls
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CPUMotherboardGraphicsRAM
Intel i5 3570 Asus P8Z77I-Deluxe EVGA GTX 660 Ti SC Corsair Vengeance LP DDR3 8GB 
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OCZ Vertex 3 120GB Scythe Big Shuriken 2 Windows 7 Home 64 Bit Silverstone SST-ST45SF 
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Silverstone SG05-450 
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Phenom II X2 560 MSI 785GM-P45 MSI HD6570 1GB DDR3 Microcenter/A-Data DDR3 4GB 1333 
Hard DriveHard DriveOptical DriveCooling
OCZ Agility 2 Western Digital Caviar Green 2TB Samsung Bluray Scythe Big Shuriken 
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