01-05-2013
If you are looking at a single CEC model of the P570 there is not a lot of difference between the P520, P550 or P570 from a "sand-box" for "playing around"
A P520 will have 1, 2 or 4 processors depending on Model,
A P550 will have a maximum of 8 or 16 depending on Model,
and a P570 will have, I suspect, a maximum of 4 processors per CEC - at least with Power5. (A P570 could have up to 4 CECS interconnected in a frame for 16 processors and much more RAM).
Personally, with a small budget - look at P520.. If you are looking for experience with more than 4 processors - P550 is probably most economical path.
Hope this helps.
p.s. Rack units don't have to be in a rack, but stacking can become more difficult when you have more than one - regardless of manufacturer.
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TR(4) BSD Kernel Interfaces Manual TR(4)
NAME
tr -- TROPIC based shared memory Token-Ring cards device driver
SYNOPSIS
tr0 at isa? port 0xa20 iomem 0xd800 irq ?
tr* at isa? port ? irq ?
tr* at isapnp?
tr* at mca? slot ?
tr* at pcmcia? function ?
DESCRIPTION
The tr device driver supports TROPIC I based shared-memory Token-Ring cards.
HARDWARE
Supported cards include the following IBM and 3Com models:
IBM Token-Ring Network PC Adapter
IBM Token-Ring Network PC Adapter II
IBM Token-Ring Network Adapter/A
IBM Token-Ring Network 16/4 Adapter
IBM Token-Ring Network 16/4 Adapter/A
IBM Token-Ring 16/4 Credit Card Adapter
IBM Token Ring Auto 16/4 Credit Card Adapter
IBM Turbo 16/4 Token Ring PC Card
IBM 16/4 ISA Adapter
IBM Auto 16/4 Token-Ring ISA Adapter
IBM Token Ring 16/4 Credit Card Adapter
IBM Token Ring Auto 16/4 Credit Card Adapter
IBM Turbo 16/4 Token Ring PC Card
3Com 3C619 TokenLink
3Com 3C319 TokenLink Velocity
3Com 3C389 TokenLink Velocity PC Card
SOURCE ROUTING
Setting IFF_LINK0 enables Token-Ring source routing. Setting IFF_LINK1 uses all-routes broadcasts otherwise single-route broadcasts are
used.
NOTES
The MCA attachment has been only tested on IBM Token Ring 16/4 Adapter/A so far. It doesn't support ifmedia(4) yet, too.
SEE ALSO
ifmedia(4), intro(4), isa(4), isapnp(4), mca(4), pcmcia(4), ifconfig(8)
HISTORY
The tr driver appeared in NetBSD 1.4.
BUGS
The PCMCIA attachment does not work with the cbb(4) CardBus driver.
BSD
April 14, 1999 BSD