Antec rear case fan causing problems.

roaf85 · Post by **roaf85** » Thu Feb 09, 2006 1:40 pm

My system is almost very quiet. I can barely have the Zalman 7700, however I am hearing a loud whooshing noise coming from the back of the computer. The noise seems to be coming from the Antec rear case fan that comes with the P150.

For reference I am running this:
P150 Case, Antec rear fan running at low setting on 12 volts
Seasonic 500 watt S12
Zalman 7700 5 volts 39C idle and 49C load
Asus A8N Sli Premium 40 idle/45 load
Gigabyte 7800GT that comes with a Zalman Vf700 running at 5 volts 50 C idle and 65C load

I tried undervolting the Antec rear fan to 5 volts yesterday with the fan set to high (high, medium, low setting did not have any effect at 5 volts) and my computer was much quieter, but my cpu idle was around 44 C and shot up to 62 C upon load and the MB shot up to 55 C on load. Video card temp did not change much. Any advice? Thanks

KnightRT · Post by **KnightRT** » Thu Feb 09, 2006 3:02 pm

CPU temperature sounds a little high for a Zalman 7700. Perhaps you can boost that fan speed slightly while reducing the rear fan?

Either way, I wouldn't fret too much. If the system isn't hard locking under load, it's not in any danger of burning up.

KRT

epiphane · Post by **epiphane** » Fri Feb 10, 2006 10:23 am

roaf85 wrote:...SNIP..I am hearing a loud whooshing noise coming from the back of the computer. The noise seems to be coming from the Antec rear case fan that comes with the P150.
...SNIP...

What about making a muffler as shown thoughout the site. Sure helped with my system.

Cheers

Aris · Post by **Aris** » Fri Feb 10, 2006 10:45 am

62c sounds fine to me. i wouldnt worry to much. in the end it will be a balance between noise and temps. when one goes down the other will go up. you just have to figure out what temps you are willing to live with under certain noise outputs. if you cant live the the current noise output then you will have to live with higher temps. its just the nature of the beast.

qviri · Post by **qviri** » Fri Feb 10, 2006 10:49 am

roaf85 wrote:Zalman 7700 5 volts 39C idle and 49C load

What's the CPU?

roaf85 · Post by **roaf85** » Sun Feb 12, 2006 8:38 pm

Sorry it has been a long weekend. I was not worried about 60C CPU temps, but all temps increase. The MB temps increase and the CPU does not stop at 60C because after I exited back to the desktop temps barely went down.

I suspect that at 5 volts one Antec Rear fan can not cool a X2 3800 processor and everything else in the system.

I was wondering if maybe getting a Nexus fan would be quieter while still pusher the same amount of air. Thanks.

Elixer · Post by **Elixer** » Sun Feb 12, 2006 9:53 pm

Keep your fan on high at 5V. Though it's very hard to distinguish between low, medium, and high on 5 volts, high is definitely faster. Make sure that the fan is on high and try your test again. Also just for reference, my tricool wouldn't reliably start on 5V on low or medium.

sonuvbob · Post by **sonuvbob** » Sun Feb 12, 2006 10:14 pm

There's a pretty noticeable difference between high and medium at 5v with mine, but it's hard-mounted. There's also a significant difference in air flow (barely any vs hard to tell if it's even on).

MonsterMac · Post by **MonsterMac** » Sun Feb 12, 2006 11:28 pm

is the top vent/120mm fan spot blocked/fan located there? in my p180, I first had that area blocked, thinking noise would escape from it, when exactly the opposite happened (it was much louder blocked, with the noise coming from the back of the computer). I unblocked it, and it's fine, and also keeps my temps down LOW because cool air for the cpu is pulled down through there.

roaf85 · Post by **roaf85** » Mon Feb 20, 2006 10:56 pm

I do not have a top vent spot. I tried the test again over the weekend and same result. All the temps go up in the system if I run one antec at 5 volts. What about getting a nexus fan?

For some reason or another now I having a really strange problem. At times when the computer is at idle it makes this really strange whinny sound and then goes away after a while. If I tap the case it goes away instantly. It almost sounds like it is coming from the Antec rear fan but it is really hard to tell. I doubt it is the seasonic S12 as it is only a month old.

Erssa · Post by **Erssa** » Tue Feb 21, 2006 12:09 am

Something is wrong with your temps, considering that also S12 is exhausting some air.

I have x2 3800+ @1.175v in my Nexus Breeze case cooled with 7000b-alcu with the fan around 5v by speed fan. It idles at 38c and heats up to 44c when dual priming (granted the fan ramps from 1350rpm to 1700). The only exhaust in my case is my NX-4090 psus nexus fan running at 4.1v.

Try undervolting the cpu.

roaf85 · Post by **roaf85** » Tue Feb 21, 2006 2:20 am

my temps are fine. I idle at 36C and hit 47C in gaming on a zalman 7700Alcu at 5 volts with no CNQ and speed fan. Also take into account that I have a Nforce4 board and a 7800GT at 5volts.

Erssa · Post by **Erssa** » Tue Feb 21, 2006 3:56 am

roaf85 wrote:my temps are fine. I idle at 36C and hit 47C in gaming on a zalman 7700Alcu at 5 volts with no CNQ and speed fan. Also take into account that I have a Nforce4 board and a 7800GT at 5volts.

Those temps are fine. I was referring to the 44c idle and 62c load temps. I have nf430 board with hotter chipset temps then you do and no heatsink on my sb that is burning hot, but granted you have the vga.

roaf85 · Post by **roaf85** » Wed Feb 22, 2006 1:51 pm

Erssa wrote:
roaf85 wrote:my temps are fine. I idle at 36C and hit 47C in gaming on a zalman 7700Alcu at 5 volts with no CNQ and speed fan. Also take into account that I have a Nforce4 board and a 7800GT at 5volts.
Those temps are fine. I was referring to the 44c idle and 62c load temps. I have nf430 board with hotter chipset temps then you do and no heatsink on my sb that is burning hot, but granted you have the vga.

The graphic card does add some heat to the case. In fact I almost think it is just borderline safe to run what I have with one case fan on low. I was thinking would the Nexus be better choice than running the Antec at 5 volts. If worse comes to worse I can run the Zalman 7700 and use speedfan to control it and then run the fanmate2 on the nexus case fan to get around 5-8 volts adjusted or a proper noise level.

roaf85 · Post by **roaf85** » Thu Feb 23, 2006 7:30 pm

Found the result of the squeaking fan. It is the Antec rear fan. Going to be replaced by a Nexus tonight.

cloneman · Post by **cloneman** » Thu Feb 23, 2006 8:50 pm

MB shot up to 55 C on load.

What do you mean by this? surely that is not the case temp.

gud4u · Post by **gud4u** » Sat Feb 25, 2006 12:03 pm

Check out air-flow restriction through your front intake vent.

A quick check would be temporary removal of your case air filter and running with the plastic front door open also. If front-restriction is a problem, you see a noticeable internal case temp drop with the front end opened up.

From review photos of the P150, it looks like snipping out the front metal fan grill is worth considering.

I'd also be concerned with the lower-rear case vent holes. Any air path other than front-to-back tends to short-circuit air flow through the front - raising the temp of your hard drives. Consider taping those rear vent holes off to force front-to-back air flow.

Hope this helps!

roaf85 · Post by **roaf85** » Sat Feb 25, 2006 7:36 pm

Thanks guys for the responses. I ordered a Nexus fan which be here some time next week.

Antec rear case fan causing problems.

Antec rear case fan causing problems.

Re: Antec rear case fan causing problems.

Re: Antec rear case fan causing problems.