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[Build Log] - The Big Budget Boomer Box (aka, the "BBBB") - Page 194

post #1931 of 3982
Thread Starter 
Quote:
Originally Posted by Reglar View Post

Great job on the PA2's, like how you split the power cords into pairs for sleeving. Since mine are hidden I just slapped a bunch of electrical tape around mine; I have a feeling you have a lot more patience than I smile.gif

Thanks Reglar. I'm happy with how they are coming along so far.


Quote:
Originally Posted by barkinos98 View Post

no stalker here, but she uses a mac amirite chris? the caption of her picture gives it away biggrin.gif

She might have setup her account on my kids Mac. But she has a PC at home. She's a PC kind of girl!
post #1932 of 3982
Thread Starter 
I finished 4 of the 8 connections in my first radiator fan power harness...and needed to take a break. So....I decided to hook them up to a PowerAdjust2 and play with undervolting them and what it does to the PA2 temperature. With 4 fans running at full speed, the PA2 stays fairly cool at about 38.5 Celsius. If I use the Aquaero to undervolt the PA2 to about 4 volts, which spins the fans at right around 400 rpm instead of 1,250 rpm, ....the temperature starts steadily climbing on the PA2 to about 44.2 Celsius. That's not bad. I think I've read that the PA2's have thermal protection that kicks in and stops undervolting the fans once the temperature reaches 85 Celsius. So that makes me think I should be able to run 8 fans without an issue. I'll finish that first power harness up tonight and do the same thing again.

The graphs available in the information pages of the Aquaero are very slick. You can overlay different graphs on top of each other...so if you wanted to see the impact of slowing down your fans on the temperatures of the PA2....you can do it all in one graph by overlaying them and adjusting opacity. You can watch live as temperatures increase and rpm's decrease. Neat stuff.
post #1933 of 3982
post #1934 of 3982
Quote:
Originally Posted by cpachris View Post

I finished 4 of the 8 connections in my first radiator fan power harness...and needed to take a break. So....I decided to hook them up to a PowerAdjust2 and play with undervolting them and what it does to the PA2 temperature. With 4 fans running at full speed, the PA2 stays fairly cool at about 38.5 Celsius. If I use the Aquaero to undervolt the PA2 to about 4 volts, which spins the fans at right around 400 rpm instead of 1,250 rpm, ....the temperature starts steadily climbing on the PA2 to about 44.2 Celsius. That's not bad. I think I've read that the PA2's have thermal protection that kicks in and stops undervolting the fans once the temperature reaches 85 Celsius. So that makes me think I should be able to run 8 fans without an issue. I'll finish that first power harness up tonight and do the same thing again.
The graphs available in the information pages of the Aquaero are very slick. You can overlay different graphs on top of each other...so if you wanted to see the impact of slowing down your fans on the temperatures of the PA2....you can do it all in one graph by overlaying them and adjusting opacity. You can watch live as temperatures increase and rpm's decrease. Neat stuff.

I run 8 fans (AP-15s) off each channel on my AQ 5 and the temps are in high-50s without any active cooling. PA-2s are about 60 as well. This is before cleaning up the mess of wiring that could only have been hurting cooling.
post #1935 of 3982
Thread Starter 
Quote:
Originally Posted by braindeadmac View Post

I run 8 fans (AP-15s) off each channel on my AQ 5 and the temps are in high-50s without any active cooling. PA-2s are about 60 as well. This is before cleaning up the mess of wiring that could only have been hurting cooling.

Good to know. I had read one thread where the guy was seeing the thermal protection kick-in with just 3 AP-15's if he undervolted them. Didn't make sense based on what some other people had reported, but it scared me. Maybe he had a bad unit. Glad to know you are not having any of those issues.


And......

I guess I won't either. I ran all 8 fans for a few hours last night, undervolted to 3.7 volts, which spun the fans at 375 rpm. The PA2 temperature climbed from about 36 to about 52 Celsius and then stayed steady. 52 isn't bad at all. Now...once I put some load onto surrounding PA2's....I guess the temperature could climb higher. But...I also don't have the fans spinning yet that are right above the PA2's. So I don't think I'm going to have any problem.
post #1936 of 3982
In martin's review of the AQ5 IIRC I read that he had to ran 5 d5's on one channel to get the thermal protection kick in. I'm running 4-5 fans / channel on mine with basically no airflow around the heatsink and have no problem with heat.

edit: here's the review, it was 2 d5's at 8v equivalent to around 26 gt-ap15's
Edited by Aximous - 9/18/12 at 9:07am
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post #1937 of 3982
Thread Starter 
Quote:
Originally Posted by Aximous View Post

In martin's review of the AQ5 IIRC I read that he had to ran 5 d5's on one channel to get the thermal protection kick in. I'm running 4-5 fans / channel on mine with basically no airflow around the heatsink and have no problem with heat.
edit: here's the review, it was 5 d5's at 8v equivalent to around 26 gt-ap15's

It was 2 D5's....not 5. And he wasn't running them on the same channel. He put just 1 D5 on one channel and 1 D5 on a separate channel. And he ended up breaking the unit in the end. smile.gif

But regardless....I'm happy that my 8 fans do not seem to be causing an issue.
post #1938 of 3982
That was a typo, sorry bout that smile.gif The point was that 8 fans per channel won't be an issue at all.
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post #1939 of 3982
Thread Starter 
Quote:
Originally Posted by Aximous View Post

That was a typo, sorry bout that smile.gif The point was that 8 fans per channel won't be an issue at all.

What temps are your fan amplifiers?
post #1940 of 3982
1st is running 4,6V 0,15A @57C
2nd 3,2V 0,06A @57C
3rd 6V 0,18A @52C
4th is running PWM @51C
AQ CPU @39C

Ambient is 27C. Thermal protection kicks in at 95C so I guess these are completely fine, at least I'm feeling comfortable with them. There is a GT few centimeters below the AQ blowing below it and the AQ is in my top 5,25" bay so if there is any airflow that's from that fan but I doubt that it gives any airflow that way worth mentioning.

Fans are all GT-AP15s and one 200mm CM fan on channel 3.

BTW really awesome and inspirational build, wish I had the funds and time to make something comparable.
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