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Typical compute cluster nodes
2 computers in one 1U rack-mount box.
24 cores, 128GB RAM, 4TB storage.
( 12 cores, 64GB RAM, 2TB storage per computer )

$5.4K

Getting 24 cores on procs spread over 2 computers represents good value.

4 procs, 2 on each of 2 motherboards.

Single computer, rack-mount.
24 cores, 128GB RAM, 4TB storage.

$8.5K

To get similar power merged into a single system, pay extra:
$1,920 for 4-capable chips upgrade
$1,180 for 4-capable motherboard upgrade

4 procs, but on one single motherboard. Those procs are twice the price.
Proc price is $890ea, or a full $480ea more than proc.

Singe computer, desktop (but noisy and hot!)
24 cores, 128GB RAM, 4TB storage.

$9.5K

In addition to above upgrade costs:
~$1K for chassis upgrade (still noisy and hot, though)

Again, 4 procs, but on one single motherboard. Those procs are twice the price.
Proc price is $890ea, or a full $480ea more than proc.