Cool, I love educated discussion on cooling
Foxbat, on 08 July 2012 - 02:32 AM, said:
... All the fans appear to be moderately slow fans though ...
In fact all the fans are throttled down to reduce noise (hate noisy comps).
The slotcket looks like a solid windproof wall, preventing horizontal airflow and creating a pocket of heated air underneath the heastsink fan.
You've touched it with a needle, Slot-1 is not good for cooling (the slotcket acts as a wall in the flow path, conventional Slot-1 heatsinks tipically obstruct northbridge chip cooling, etc).
To secure the correct flow path (low front to high rear) I sealed every other opening in the case (sides, floor, top, and every opening in the rear unless extractor fans). After that it's just a matter of tuning the fans RPM to get the required total cfm with minimun noise.
The PSU should help facilitate vertical airflow along the wall, but on the other side of it, the exhaust fan could be fighting with the PSU fan, perhaps breaking up the flow.
I drilled as low as possible, but the new rear 120 fan had to be relatively close to the PSU fan. I worried too about both fans 'fighting for air' in detriment of total flow, and considered drilling the top and flippng the PSU upside down.
In the end empirically they work OK together and as you say the PSU fan helps with 'turning the wall'.
I wouldn't imagine an overclocked 440BX producing much heat, unlike todays systems where TDP can exceed 400 watts or more, so it's probably running comfortably.
Yeah, at 33W TDP a Tualatin 1400-S is really small game, just with the minimal gadgets posted above you can keep it at 48C / 118F under torture while at 29C / 84F ambient. Notice I didn't even bother with intake fans, no real need.
The 440BX VRM 8.4 mosfets can be more of a problem however. They were designed for Coppermines, get extra stress with the Tualatin, and can fry if we don't take extra cooling measures.
I'm amazed that a slot board with a slotcket and a Tualatin can outperform a P4 running natively. Makes me wonder if I should try to find an FCPGA2 Tualatin adapter for my 815 board... but then I might as well buy a whole mobo instead.
Man this board has me astonished
. Good ol' 440BX is truly a legend