How much should new pump decrease temperatures? - Page 3

This is BOINC crunching stuff. It's not fully stabilized yet temperature wise but it will stabilize around 46 .. 48 C CPU temp wise with ambient around 20C atm (note the relatively high core voltage of 1.536 with LLC). GPU max temp is ~45C but it's mostly bcos of the GPU block I'm using - strictly speaking its not GPU block but it's intended for north-bridge but hey, it's copper and water goes through it so it gets the job done. I have atm only one GPU in my system as I'm waiting the delivery of second one so have removed the second 6770 waiting for new GPU.

My pumping system is a lot weaker than yours (2x Alphacool DT-LT pumps, which are ~4W pumps) and my fans are atm in pull (which means that the airpressure at radiator is almost nonexistent). I'm using 8/10mm tubing and have quite a lot of 90 degree fittings. There are also some issues with loop atm which castrate the flow rate a bit (little kinking, filling tube directly at pump output, etc).

All that considered the temperatures are pretty good. My computer is I would say about 25 dB or so. Main reason for that is the AeroCool Shark Red Devil Edition LED Fan - 140mm fan on the sidepanel - its quite audible even at 7V (its very strong fan, but its kinda loud, at max rpm its 110 cfm and quite high air pressure).

Edit: I should clarify a bit - even if I sort out the minor issues with my loop I'm not expecting the temperatures drop significantly. As far as I have seen it's really really hard to get your CPU cores to drop more than 20C above the water temperature. Mine are at approx +25C I think (have old revision of 1055T so temp sensor is not very accurate in CPU) Before I damaged my water temperature sensor my water delta was hovering between 5C and 10C (depending on fan and pump speeds). So - with ambient at ~25C I'm hitting at approx 55..58C core temperature at CPU. I have EK HF CPU block.
Edited by Carniflex - 8/9/12 at 1:26am

I'm not sure about 2m tbh, probably not as my comment was based on testing them with just jumpstarted PSU and I was about 20 cm from the fans. I was expecting "17 dB" to be lower, however, I would guess they use the same standard as others when they claim these dB number and in reality its probably a bit over 20 dB at max rpm.

Regardless, in my opinion these are very good quality fans and just outright steal at that discounted price they are in Aquatuning. Note also that if you have fan controller then their starting voltage is ~6V meaning that they should get as low as ~600 rpm which should be quite inaudible. I'm just running them at max atm as cant hear them anyway over my 140mm howler. I'm using one to 9 splitter (they are very low wattage) and running them through a 8W fan controller. Cable was something like http://www.aquatuning.de/product_info.php/info/p7910_Y-Cable-3Pin-Molex-to-6x-3Pin-Molex-60cm.html just from one 3 pin to 9x 3 pin.

These straight fittings would do the job just fine if you are also using 8/10 mm tubing. BTW these are also at discount price at aquatuning - http://www.aquatuning.de/product_info.php/info/p4845_10-8mm--8x1mm--compression-fitting--G1-4-revolvable---black-nickel.html
Edited by Carniflex - 8/9/12 at 2:08am

I think the 4x180mm grill is supposed to be this item - http://www.aquatuning.fi/product_info.php/info/p10595_Phobya-Nova-tuuletinsuoja-4x180mm-musta.html with 180mm fans it should be even more quiet and perform better - I would assume. Especially if both are downvolted as larger fans are supposed to hold the airflow better at low rpm. Then again the grill + 4x 180 mm will add substantial amount over the discounted SiF-1201 fans.

Be careful that you do not exceed the power rating for the fan header on the motherboard. Ganging fans together could overdraw the header, and could result in failure of the motherboard itself, not just the fan header.

I doubt that there is high difference in the noise levels between the SiF-1201 and these 180mm fans at max rpm, however, the 180mm ones can offer you substantially higher performance (the 32mm thick ones) as they have a lot higher airflow - downside is that with the fangrill + fans the 32mm ones cost basically the same as getting the second radiator.

Considering that even with 120mm fans your performance should be already quite solid then in my opinion the 180mm is not worth the additional cost unless you really have already so quiet system that you can hear them strong enough for it to be distracting.

And yes - the linked items seem to be the correct ones.

The SiF-1201 is very low power consumption fan and 9 of them can run just fine off a motherboard fan header - I did it on various MB fan headers before switching to a small fan controller. Ofc with stronger fans one should keep an eye on power consumption. usually things tend to get iffy around 1A current per header altho some CPU headers (for example many higher end Gigabyte boards) are rated for up to 2.5A on the fan header.
Edited by Carniflex - 8/10/12 at 1:43am