diep at xs4all.nl
Wed Dec 28 11:46:10 PST 2011
On Dec 28, 2011, at 8:17 PM, Lux, Jim (337C) wrote:
> On 12/28/11 11:00 AM, "Vincent Diepeveen" <diep at xs4all.nl> wrote:
>> Yeah Jim good comments,
>> I was thinking for my cluster to overclock, which is why i guess some
>> posted the overclocking sentences,
>> and wanted to do it a bit more cheapskate.
>> Latest idea now was to save costs by using for say a node or 16,
>> to order 16 cpu blocks and 16 small pumps and 2 cheap big reservoirs:
>> Coldreservoir ==> 16 minipumps ==> 16 cpu blocks ==> Hotreservoir
> Hmm.. Over the past few years I've been trying different schemes to
> keep a
> bunch (a cluster?) of glass bottles full of 750ml of an 12-15% alcohol
> solution in water at a reasonable temperature (15C or thereabouts),
> I've gone through a wide variety of improvised schemes. (aside from
> buying a purpose built refrigerator.. Where's the fun in that?)
> Unless you need small size with high power density, very quiet
> or sealed cases, BY FAR the easiest way is a conventional air
> blowing cold air through the system.
> Schemes with pumps and radiators and heat exchangers of one kind or
> another have maintenance and unexpected problems (stuff grows in
> any liquid, metals corrode, pumps fail, plastics degrade).
> A very inexpensive window airconditioner (US$99, 8000 BTU/hr = 2400
> draws about 500-800 Watts (depending on mfr etc). The Coefficient of
> Performance (COP) of these things is terrible, but still, you ARE
> more heat out than electricity you're putting in.
> A "split system" would put the noisy part outside and the cold part
> The other strategy... Get a surplus laboratory chiller. Put THAT
> and run your insulated cold water tubes down to a radiator/heat
> in your computer box. At least the lab chiller already has the
> pumps and
> packaging put together. Run a suitable mix of commercial
> antifreeze and
> water (which will include various corrosion inhibitors, etc.)
> But really, cold air cooling is by far and away the easiest, most
> free way to do things, unless it just won't work for some other
How about 2 feet thick reinforced concrete walls?
From ease viewpoint we totally agree. yet that won't get even close
to that 4.4-4.6Ghz overclock.
For that overclock you really need stable watercooling with low
So those cooling kits are there anyway. Just i can choose how many
radiators i put inside the room.
Good radiators that use the same tube system are expensive. Just a
single big huge car radiator
that you put on the roof is of course cheaper than 16 huge ones with
each 3 to 4 fans.
Realize that for home built clusters so much heat inside a room and
burning that much
watts is a physical office limit. Like you can burn a watt or 2000
without too much of a problem,
above that it gets really problematic.
This office has 3 fuses available. Each 16 amps. Practical it's over
230 volt. In itself one fuse
can't be used as the washing machine is on it. So 2 left. Now on
paper it would be possible to
get 4 kilowatt from those 2. Yet that's paper.
All the airco's also consume from that.
With the 16 radiators and 3 to 4 fans a radiator we speak of a lousy
48-64 huge fans just for cooling 16 cpu's.
Also eats space.
The airco here is rated using a 1440 watt maximum and uses practical
a 770 watt or so when i measured.
The noise is ear deafening. Now for the switch i can build a case
that removes a lot of sound from it,
also because switch isn't eating much, yet it's a different story for
So removal of noise sure is an important issue as well, as i sit the
As for the nodes themselves, realize idea is mainboards with
underneath say 0.8 cm of space, and 16 PSU's.
Next posting i'll try to do an email with a photo of current setup
using an existing mainboard.
You'll see the constraints then :)
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