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LithoTech:
The reason why your sink doesn't get warm is probably because you haven't activated the 4V jumper. If you do that (I'm using 3.5V right now) it gets very hot. As I said, I nearly burned my skin off

And still, after this modification, it gets around 60C at load.
I'm running BH-5 atm, 3.5v, priming a 260mhz setup.
I'll put that thermal sensor back on there the next time I have the fans out of the way, probably later today when I flip the jumper back. I'll update here when I get new data.
That is the biggest problem with this setup, the fans block access to the mobo and even though they are easy to remove, it's a pain to have to do it a lot.
Also, that is a LOT of fans :shake: I am really going for a quiet system myself, and have ordered some Nexxus Real Silent 120mm fans and sound dampening material. Doesn't those fans blowing onto the motherboard/memory destroy the airflow pretty much? It seems to me that they create a lot of turbulence. Nice airflow though :nod:
It's a sickness I tell you! It starts off innocent enough, just one extra fan, a small one. Then you start sneaking them in when the case isn't looking. The next thing you know its controlling your life! :eek2:
Low speed low noise 120 fans are still great airflow. Keep one or both of the exhaust as tri-cool for the option of extra speed, the higher flow of exhaust alone can make a huge boost on the flow of the rest. At least that is my theory on it based on my own results, others that I have read, and my understanding of areodynamics, convection and cooling.
Basics: an air cooler works off of convection, transfer of heat from one element to another. The cooler connects to the hot chip, sucks heat off it, dissipates the heat through it's own material and surface, and then looses a certain amount of that heat due to air taking it off of the surfaces.
The physics of air taking heat off a surface is the same as the surface taking it off the chip. The air comes in contact with the surface, and steals the heat or energy. It is the same thing as wind chill, only we call it wind chill to describe winter sub-zero temps that are dangerous to us. But it is the same thing.
Therefore, we must understand two things:
1) the larger the surface of the HS cooler, the better it will perform (providing its convection properties are up to snuff). This is why they make them with so many fins, it creates much much more surface area. In the cooling world, surface area rukes as much as convection properties.
2) Air convects too, so the more air that passes the surface area of the cooler, the more temperature will be taken away from the cooler.
The temperature of the air passing the surface of the cooler has a direct affect on how much temperature it takes away, but we are not as concerned about this as much as its dwell time or how fast it passes the surface. The more air that passes the surface, the more temperature it will take away. Think of each molecule of air being it's own surface. We want lots of molecules passing by because that will take off more temperature than
cooler, slower moving air will.
In light of this,
I'm never too concerned with turbulence!
Additionally, any performance cpu HSF is pretty powerful and causes a lot of turbulence on it's own. It is the exhaust that manages the continuation of the airflow in the proper direction.
In my case, I've tripled the turbulence, at least, I admit, I have a problem.
But I have doubled the exhaust, at least, and when set to high those fans pump out air like crazy. Putting my hand at the back or top of case and feeling the air rushing out is quite satisfying. In fact, it was so good that I ended up putting a low speed quiet coolermaster 120 in the top exhaust because that is the one that can be heard -- they are a lot cheaper than the tri-cool, allowed me to use the tri-cool elsewhere instead of running it on low all the time.
For intake, I have the regular front which works fine (one of the stock black 3 speed fans), and an AC 120mm which is quite powerful and extremely quiet, mounted in the 5.25 drive bays.
I wish I had a vid camera to demonstrate this, the best way to see airflow in your case, and the worst habit you could possibly think of taking up: lite-up a cigarette and wave it in front of the intake and see how powerful the draw is.
The draw from the (currently unfiltered) 5.25 bastard rig is at least double the draw I get from the filtered stock intake. The lower chamber intake is slightly below that. Putting a fan in front of the lower HD tray would make a huge difference here, I can't wait to takle it! Hoping to see a pic of how it was squeezed in!
In an case, I have plenty of intake and the case is never starving for air even when the fans are on low and the case is closed -- I'll call this
silent mode. Note, the AC intake fan has no speed adjustment other than it kicks into an ultra high speed if one of the thermal sensors passes an alarm setting. Also, when the case is in silent mode, the intake for the AC has all the blank plates inserted etc.
Unfortunately, I can't see whats happening to the smoke when in silent mode. But following a good drag of it into the case when it is open showed me nothing more than smoke being blown all to smithereens and blasted away to nothing in a matter of seconds.
While the case is open, fans high, it really isn't an issue because there isn't and doesn't need to be an airflow, all fans can draw from outside of the case so to speak. We really are only looking at when the case is closed, in silent mode. It would be interesting to put a web cam inside the case and see if I could get some shots of smoke. I don't smoke inside the house, and don't like the idea of blowing smioke in my case for 45 minutes trying to get the right shot, but it could be interesting and a worthy sacrifice for the shit I will get for lighting up inside.
So I can only conclude that I am getting plenty air in from the front, passing the mobo, cpu, vid and ram, being blasted in any way it does depending on fan speed at the time, then getting sucked out.
If I had some sort of whirlwind effect where air was circulating and not being exhausted, I would be seeing super heating in some areas, especially when compared to an open case. So I am concluding that this is not happening.
Playing with the fan speeds in silent mode can greatly affect cooling. In most previous layouts I spent time adjusting front and rear speeds a bit, noting temps and comparing then settling on a basic setting for surfing/folding or gaming/overclocking.
Lots of other P180 users find the same thing. For example, iirc: setting the front to low, and one exhaust (rear) to high, and the top exhaust to low or even intake, created a very good performing silent mode because the only high speed fan is the farthest away from the user.
Some opt to not run a front fan at all, for systems that aren't overclocked or loaded a lot and the case is exposed like in a livingroom HTPC situation. The exhaust fan alone should be enough to draw intake, a decent AMD system running stock speeds with a good HSF would never break a sweat doing an HTPC load in a P180 configured like this. I'd defy anyone to hear the fans in it with the TV on.
ripken204:
How the h*ll did you mount a fan in the front of the lower chamber without removing the bracket? Really want to see that :drool:
I would very very much like to see this too.
Chaos_2k:
Actually, I attached it with a wooden screw :cool: It grips in between some of the pins on the Zalman sink. I just put it through the upper right hole on the fan and used a screw driver to attach it.
Also good to know! Do you think that zalman with a fan on it outperforms the VC-RE? It probably should, based on the above physics it has much more surface area and a much larger more powerful fan. It may not be copper, but while copper conducts heat well throughout it's surface, it doesn't transfer it to air as well as aluminum. It would be really cool to get some comparisons here.
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