At 08:48 PM 11/4/00 -0500, Allison wrote: 3200 - KA650 3400 - KA640 (also the 3300) 3600 - KA650 (also the 3500) The important point here is that in a BA23 or a BA123 only the KA630, KA650, and KA655 CPUs will work with the existing cabinet kit (console port connection etc). The KA640 and the KA660 are both constrained to living in BA2xx or BA4xx chassis since there wasn't a cab kit that would mount on the BA23 or BA123 plates. In terms of performance they rank KA630, KA640/KA650, KA655, KA660 However the KA640 has an on-board DSSI interface that gets 4MB/sec to the drives vs the Q-bus interface on the KA630, KA650, and KA655. The KA660 also has DSSI on the CPU card. The MicroVAX 3300/3400 were the same machine in different cabinets, the BA215 (narrow) and BA213 (wide). I've also seen them badged VAXServer 3300 or VAXServer 3400. The MicroVAX 3500 and 3600 only came in the BA213 primarily because without an on-board ethernet or disk interface, you were stuck using at least two slots for a DESQA and a KFQSA leaving you only 4 slots for the CPU + Memory + anything else. The MicroVAX 3800 and 3900 used the KA655 CPU to achieve somewhat better performance however the VAX 4000/200 in the same cabinet was faster still and had the advantage of the on-board DSSI for better disk throughput. --Chuck