With regard to this thread, well, largely this:
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View of Cluster from system ID 1029 node: GUDRUN 17-SEP-2012 23:11:38
+------------------------------------------------------------------+
¦ SYSTEMS ¦ MEMBERS ¦
+--------------------------------------------------------+---------¦
¦ NODE ¦ HW_TYPE ¦ SOFTWARE ¦ STATUS ¦
+--------+--------------------------------+--------------+---------¦
¦ ALBOIN ¦ HP rx2620 (1.40GHz/6.0MB) ¦ VMS V8.4 ¦ MEMBER ¦
¦ AUDOIN ¦ HP rx2620 (1.40GHz/6.0MB) ¦ VMS V8.4 ¦ MEMBER ¦
¦ ALAHIS ¦ AlphaServer DS15 ¦ VMS V8.4 ¦ MEMBER ¦
¦ LETHUC ¦ AlphaServer DS10 466 MHz ¦ VMS V8.4 ¦ MEMBER ¦
¦ GISULF ¦ AlphaServer DS10 466 MHz ¦ VMS V8.4 ¦ MEMBER ¦
¦ GUDRUN ¦ Digital Personal WorkStation ¦ VMS V8.4 ¦ MEMBER ¦
¦ ULRIKA ¦ Digital Personal WorkStation ¦ VMS V8.4 ¦ MEMBER ¦
+------------------------------------------------------------------+
The HP rx2620s have dual “Montecito” hyperthreading/dual-core SL9PCs in them and 24 Gbytes RAM each, also 10GbE and a bunch of other additions. HPVM works nicely, too.
The HP DS15 is a 1000 MHz EV68CB, with 4 Gbytes RAM, has an original (read: costly) HP/Compaq ATI Radeon 7500, with active cooling (thus no noise, no artifacts and great picture quality) and runs SRM V7.3-2 (2008). Various additions, such as dual-ported GbE “DEGX2” (Broadcom BCM5704 via the fairly well-known PCI ID modification trick). The Compaq DS10s have a (as is mentioned above) 466 MHz EV6, with 2 Gbytes RAM each and various 3.3 and 5 V add-ons, whilst running SRM V7.3-1 (2007). To my pleasant surprise, the DS15 ― thanks to the improved bus and bandwidth, with PCI-X, compared to the DS10 ― also runs fine with a 10GbE adapter, which I installed recently; while the DS10s, not surprisingly, couldn't handle it at all.
The DEC, “Digital” or even “[d|i|g|i|t|a|l]”, Personal Workstation 500au systems have the stock 500 MHz EV56 and I increased the RAM to the theoretical 1½ Gbytes in each of them, although I'm not sure how good the memory will eventually prove to work. They run a version of SRM that doesn't sound too old, but definitely feels so (V7.2-1, 2000). I've heard and read that there are issues involved, so I'll see. It's too bad that pre-EV6 systems, like these, don't support Radeon 7500 cards.
Besides the above, I also have a DEC Multia/UDB VX40B, with 166 MHz LCA4, 256 Mbytes RAM and the AXPpci233 “MT Common Console” X4.5-819 (1996). The 340 Mbyte 2½" (old, non-SCA... obviously) SCSI disk died a while back. Before it died, I ran NetBSD/alpha V5.1.1 and also briefly VMS V7.3 with the DEC employees' initiative “midnight hack” kit. I've since been trying to get a so-called PowerMonster II SCSI<=>CF adapter to work, where the manufacturer (“Stratos Technologies”, via the “Art-Mix” company from Japan) told me to be looking into getting it to work for Alpha systems, so I'll await it.
I used to also have a bunch of maxed out HP rx2600s (only a System Board, SL6XF, memory and various ― mostly spare parts ― still left) and a DEC AlphaServer 1000, but I got rid of those over time. Well, that's about it...