quiet, good system, low heat

I need to replace a dell 2.8 512M ultra slim.
It is quiet but runs hot.

I have dell sc 420 poweredge, also runs pretty hot.
The poweredge 2600s servers are loud.
The poweredge 1850 rack servers are like airplane engines.

Can someone recommend a reliable system that doesn't throw enough heat to cook my breakfast and isn't so loud as to cause me to need ear protection.  This is ridiculous.

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We use servers built on shuttle barebone PC's. They are very quiet, some have builtin raid controllers with raid 5 capability (You can fit 3 drives inside, with a 4th external sata-ii connector), and if you use Samsung's spinpoint drives you also get the lowest noise drives on the market, and I've never yet had problems with those disks or the shuttle system.

How about a low-power Opteron system? Here's rack unit from IBM that you can configue with a low-power Opteron:

Here's a blade server:

Something like that should be quietly cool, or at least you should be able to safely spin the fans more slowly without worring about cooking your processor(s).

Here are some Opteron-based servers from Sun:

Those UltraSPARC T1 processors on that same page look pretty cool, too:
"The UltraSPARC T1 processor with CoolThreads technology is the highest-throughput and most eco-responsible processor ever created. It is a breakthrough discovery for reducing data center energy consumption, while dramatically increasing throughput. Its 32 simultaneous processing threads..."
Anandtech reviewed that particular chip here: http://www.anandtech.com/cpuchipsets/showdoc.aspx?i=2657
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gsgiAuthor Commented:
So far I have figured out the a opteron 2.6 is faster than a pentium xeon 3.4 and will run cooler.  (thanks SaxicolousOne)

I read that the ibms are loud and that the 2100 from sun has usb problems among other issues.

I am trying to keep machine cost to between 2 and 3k.  2k for the single HD units and 3k for the raid units with more HDs.

I was once under the impression that raid 5 with 3 or more drives would continue to boot and run even if 1 of the drives failed,
and that in a mirrored senario, the data was safe, but if the boot drived died, the system would not boot until you flipped
the "boot" drive to the 2nd disk, and maybe broke the mirror.  (that sound suspiciously like software raid.)

Anyway, that goes back to like 1995.  I also read in Storage on EE that SCSI raid 5 with > 3 disks is *still* going to beat SATA.
In throughput; I think they we saying that the SCSI backplane can move (or caches) more data than a SATA raid controller.
This was last year, perhaps before SATA went 10k.  Do we know that SATA raid will run as well as and for as long as SCSI raid?

How about a small SAN - any of you using one?

Rindi: & nobus:  Thanks for the info!   What do you do to keep heat down?

you can use one of these for the cpu :  

but they have products for the other chips too
SCSI will beat SATA, but SCSI HD's are usually what makes noise and generates a lot of heat. If you need to change a "switch" on a raid1 system to boot from the other disk depends on the raid controller. If it is a good controller you can take a disk out of any redundant array and it will keep on running and should also be bootable.

Sata is a lot less expensive than SCSI, so in theory you can easily loose a couple of disks.

The shuttle boxes along with 3 such samsung disks don't need extra cooling.
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