golf ball fans...

[tommyshango]

anyone know the performance vs sound differeence between the 1000 rpm and the 2000 rpm ? im wonderin if 4 of the 2000 on 2 pa120.2 would be greater performance than 4 1000 rpm ones...

[[cTx] Nooc]

anything above 1000rpm on any PA series as seen from the PA 120.2 vs. MCR-320 test is a waste of RPMs since it doesn't yield any significant gain. 2 1000rmp ones will be just enough.

[serialk11r]

Performance will be greater, yes. Depends on what you think is tolerable. Best way is to get a fan controller or make some adjustable voltage converter, and tweak the fans until you think the noise is acceptable. Oh and, in your case, don't even think about push pull. Push pull gives only about 10-20% improvement depending on the situation, at DOUBLE THE NOISE. Oops sorry I didn't notice you had 2 PAs, but anyways at least some extra info is on this forum now :)

[[cTx] Nooc]

Performance will be greater, yes. Depends on what you think is tolerable. Best way is to get a fan controller or make some adjustable voltage converter, and tweak the fans until you think the noise is acceptable. Oh and, in your case, don't even think about push pull. Push pull gives only about 10-20% improvement depending on the situation, at DOUBLE THE NOISE. Oops sorry I didn't notice you had 2 PAs, but anyways at least some extra info is on this forum now :)

doubling the amount of fans doesn't necessarily double the amount of noise...

but what the hell do I know, I didn't take the SAT in 8th grade :D

[serialk11r]

doubling the amount of fans doesn't necessarily double the amount of noise...

but what the hell do I know, I didn't take the SAT in 8th grade :D

Yea it depends on how the fans are but I think we can accept that 2 fans is going to be a good deal louder than 1 :D

[Polizei]

Hard to say what double the noise is... Since sound aplitude is a logarithmic formula, doubling the end value isnt double the sound. Each 3dB increase is technically twice as loud, but doesnt seem like it.

Careful when you say twice as loud... someone might think of a jackhammer being twice as loud as a library and thats not what doubling the fans does, doesnt increase the noise by that much.

[serialk11r]

Hard to say what double the noise is... Since sound aplitude is a logarithmic formula, doubling the end value isnt double the sound. Each 3dB increase is technically twice as loud, but doesnt seem like it.

Careful when you say twice as loud... someone might think of a jackhammer being twice as loud as a library and thats not what doubling the fans does, doesnt increase the noise by that much.

Yes it depends on a lot of things, but like I said, I think we can all agree that twice the number of fans will be a hell of a lot louder.

[tommyshango]

im wondering whether the 2000 rpms are much louder than the 1000 and whether there is a performance increase using 2000 vs 1000. Just trying to find a way to drop temps more.

[serialk11r]

Yes there will be a performance increase albeit a relatively small one.

[tommyshango]

I guess its just weird.. they are so silent you dont think they are working.. after uninstalling my gpu loop and then redoing it so now this is what i have...

2x mcw655 in a series pushing apogee gtx
then 2x mcw30 on north and south
then it runs into each pa 120.2
then back to a swiftech microres.
all in 1/2 inch tubing.. my idle temps didnt seem like they dropped.. well thats because I found out they cant get any lower..

I went up to 1.65 volts and was running orthos and could only get it to go to 48C... thats almost a 20 degree drop.. actually i never got it up to 1.65 before. So now I have a huge amount of room to play with .. im just trying to find some settings that will work better. I thought maybe the 2000 rpms on the thermochills would help alot but it seems just having 2 radiators is an incredible difference in temperature.

[serialk11r]

I guess its just weird.. they are so silent you dont think they are working.. after uninstalling my gpu loop and then redoing it so now this is what i have...

2x mcw655 in a series pushing apogee gtx
then 2x mcw30 on north and south
then it runs into each pa 120.2
then back to a swiftech microres.
all in 1/2 inch tubing.. my idle temps didnt seem like they dropped.. well thats because I found out they cant get any lower..

I went up to 1.65 volts and was running orthos and could only get it to go to 48C... thats almost a 20 degree drop.. actually i never got it up to 1.65 before. So now I have a huge amount of room to play with .. im just trying to find some settings that will work better. I thought maybe the 2000 rpms on the thermochills would help alot but it seems just having 2 radiators is an incredible difference in temperature.

Series or parallel?

[Cronos]

PA120.3 with 1000rpm fans has C/W resistance >0.03
with 2000rpm ~0.02.
What it means, for 300W load, 1000rpm will give 9C inlet/air, 2000rpm -6C inlet/air, 3C difference. Not a big deal, probably, if we take into account that 1000rpm is near silent and 2000rpm is quite noisy.

Two fans produce twice the sound pressure, that is 3db louder, than 1 fan.
3 fans ~5db
4 fans ~6db
6 fans ~8db

[tommyshango]

umm I have the outlet of the one running into the intake of the other and then the outlet of that runs to the apogee gtx on the cpu... i think lol.

[serialk11r]

PA120.3 with 1000rpm fans has C/W resistance >0.03
with 2000rpm ~0.02.
What it means, for 300W load, 1000rpm will give 9C inlet/air, 2000rpm -6C inlet/air, 3C difference. Not a big deal, probably, if we take into account that 1000rpm is near silent and 2000rpm is quite noisy.

Two fans produce twice the sound pressure, that is 3db louder, than 1 fan.
3 fans ~5db
4 fans ~6db
6 fans ~8db

The formula for db is 10logx. Basically, a sound with x times more amplitude is 10logx more db. If we plug it in, 2 fans is 10log2=10(0.301...) which is about 3. 3 fans is 10log3 (I'm lucky I have my TI84 plus next to me ;)) which is 10(4.77...)=4.77db. 4 fans is 6.02, 5 is 6.989, 6 is 7.78, etc. so yea those are pretty accurate. The only problem is, human ears register sound differently. Something that's 40 db won't sound 100 times louder than something that's 20 db. Just take some dual ball bearing evercool, and turn it to the max. Then take a yate loon, and undervolt. Now the evercool doesn't sound 100 times louder does it?
But anyways, the point being, 2 fans will be significantly louder than 1 and that's a fact.

[Cronos]

"Decibell" measure was invented specifically to account for -experimentally determined- near logarithmic scaling of subjective noise level with sound pressure. There is no big science, actually, just empirical observation and easy to use logarithmic scale.

[tommyshango]

umm u guys lost me with the technical talk. just wondered if anyone had used the 2000 rpm golf balls and was able to tell me how loud they are.. so far the loudest thing in my pc is the hard drives and nothing you can do about that.

[clone38]

Ive got both 2000 and 1000 sharkoons,i run the 2000rpms on my 120.3 thermochill rad with a fanbus,the 1000rpm fans are very quiet but ive never used them on my rads just to cool the case.

[ranker]

I have sharkoon golfball 2000's in pull for my PA120.3. I had them on my PA120.2 but removed them just due wanting more room to work my tubing.

The 2000's push a heck of a lot more air than the Yates at maximum voltage. They undervolt quite well and I don't hear any sort of mechanical noises coming from them. However, they are connected to attenuators. I'm not sure if they wouldn't make sound without them and I'm too lazy to test if they would or not.

I thought Scythe fans were good. Golfballs are better than the Scythes in terms of air pushed vs sound generated.