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 Post subject: Fanless Zalman 6500Cu-B?
PostPosted: Mon Dec 16, 2002 7:41 am 
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Posts: 48
Ok, since nobody has really replied in the "Article Discussion\Heavyweight P4 Heatsinks Roundup Review", I'll inquire here, also.

I have a GlobalWIN YCC-61F1-B case, that has a front and rear 120mm fan mount and I would like to run the Zalman 6500Cu-B on, probably, a P4 2.8GHz processor. I will not be overclocking. My fan choices are either the Pabst 4412 FGL or Panaflo L1A's.

I'll probably also run with an Antec TruePower 550W power supply. So, that will mean that there is the intake for the power supply and the 120mm exit fan, practically surrounding the 6500Cu, with some help with incoming air from yet another 120mm fan up front.

I also plan on going fanless Zalman on my graphics card, also.

So, will this be sufficient?

Thanks,
CRT_Leech


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 Post subject:
PostPosted: Mon Dec 16, 2002 9:21 am 
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while i expect you will have some great circulation through your case, my initial impression is that it would not be enough on its own, at least at a heavy load. i'm basing this impression on another similar setup someone had that was working pretty well in the 1Ghz range (not sure if Intel or AMD). A 2.8P4 seems pretty far out of that range. that's just my thoughts...i suppose there is only one way to find out! :wink: it probaby also depends on just how close that rear exhaust fan really is to the heatsink.


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 Post subject:
PostPosted: Mon Dec 16, 2002 3:09 pm 
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Well, the Zalman 6500Cu is one of the best C/W ratings for a P4 heatsink and some of the testing shows that even in "silent mode", that it cools sufficiently and that is with most cases running 80mm fans.

Here's some pics of the fan location:
http://www.burnoutpc.com/images/reviews ... xaust1.jpg

Here's one showing the intake for the power supply about 1" above the heatsink location:
http://www.burnoutpc.com/images/reviews ... plete1.jpg

I guess I'll have to see how it works...


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 Post subject:
PostPosted: Mon Dec 16, 2002 11:44 pm 
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Location: Reinheim, Germany
I tried this out some while ago. I've tried to remove as many fans from my Lian-Li PC60 case as is humanly possible, so the ONLY fan actually running other than the CPU fan is the one in the Zalman ZM300-BLP power supply! There are NO additional case fans or anything stupid like that.

P4 1.8 Northwood on an Epox 4BDA2+ motherboard, using Prime 95, the results were as follows ...

1. Zalman 6500CU with Zalman 90CM fan running at ca. 1100 rpm (This is the normal setup) ... Temperature rose slowly to ca. 41C then stabilized.

2. Zalman 6500CU without any fan ... Temperature rose quickly to ca. 55C. then slowly to 60C where it then stablilized.

The Zalman is one hell of a heatsink, but i think that attempting to run it fanless on a P4 2.8 is asking too much. Just look at the difference that a slow running fan made to my tests, almost 20C.


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 Post subject:
PostPosted: Mon Dec 16, 2002 11:52 pm 
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You could try alittle ducting from your 120mm exit fan to the heatsink, to draw more air past it. That's exactly what I did:

Image

For more description check out the full article here:

Rusty's Quiet In-Desk PC

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 Post subject:
PostPosted: Tue Dec 24, 2002 8:46 am 
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If I decide to go with the Zalman, I may either use the bracket, but, mounted in a different location, or make my own bracket, to mount an additional 120mm fan.

I was thinking about making a bracket/standoff, that would mount the fan to the mainboard tray, aimed at the Zalman heatsink. It would have enough of a gap to at least allow a couple IDE/FDD ribbons pass through it and also keep the fan from being blocked by the motherboard. It would also be in a straight line to the exhaust fan. Hopefully, this will be close enough to be a sufficient cooling solution for the 6500Cu.

Otherwise, I may go with another efficient HS with a Panaflo L1A.


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 Post subject:
PostPosted: Tue Dec 24, 2002 9:31 am 
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With the Antec550's dual fans & a 120mm back case fan, I suspect you could run the P4-2.8G fanless with the 6500cu. But it is so easy to just try it and find out!


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 Post subject:
PostPosted: Thu Dec 26, 2002 7:28 am 
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That it is. Which is what I think I'll do. I'll keep those other ideas as options if the heat is too high.

I'll give UPS and FeEx a couple days to recover from the Christmas rush and start ordering my parts. :D

Thanks everyone for the suggestions,
CRT_Leech


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 Post subject:
PostPosted: Thu Dec 26, 2002 9:12 am 
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Location: Belgium
Rusty, how exactly does the air get *inside* that thing? It looks like it's completely sealed off, or am I not seeing straight?


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 Post subject:
PostPosted: Thu Dec 26, 2002 10:05 am 
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Location: Richland, WA
The 'front' side is open along the flat side of the cooler. Look close and you'll see the corners around the curve of the cooler are angled off, not completely sealed.

Looks like a purty darn good duct to me.


Zyzzyx


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 Post subject:
PostPosted: Thu Dec 26, 2002 10:12 am 
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Exactly Zyzzyx. This way the air gets pulled parallel to the fins, so in theory its more effecient than just blowing the air down onto it from above.

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