zx1 chipset 'obsession'.
Both are maxed-out in my case: C8000 came maxed-out and rx2600 i maxed by myself. As for C8000: supported video-option is better there - ATI FireGL X3 (for IA64 you're stuck with X1, which occupies two slots
), processor option is interesting, comparing with IA64 - i have 2x dual-core PA8900 (so 4 cores in total, in rx2600 i have 2 cores) with huge
caches, another very cool thing is that i got C8000 with full room of RAM, rare 4 Gb PC2100 modules in 8 slots total - 32 Gb at all, so C8000 is ideal for HPUX`ing
For rx2600: integrated ATI 7000 on iLO MP card is a nice bonus (it's supported by OpenVMS DECWindows for example), i have an AGP riser option also: so outstanding graphics for HP-UX (up to ATI FireGL X1), Windows and Linux is there. CPU option is unique of course (EPIC architecture, opportunity to run unique systems like: Windows/IA64 and OpenVMS finally, nice threading and productivity with dual 1.5 Ghz / 6M L3 cache CPUs), room space for RAM is also awesome: 12 slots, up to 24 Gb officially, up to 48 Gb (!) un-officially (should be, i checked by moving 8x 4 Gb sticks from my C8000 there, remaining 4x slots were filled with 2 Gb sticks - and i got 44 Gb working there
), but for 48 Gb i wasn't be able to find cheap 4 Gb kits at all, so stayed with 2 Gb modules.