> Chuck McManis wrote:
	>Ok, the HW FAQ however shows the 4000/100A as being NVAX @ 72Mhz
	>and shows the 4000/90 is NVAX @ 72Mhz and 40 VUPS. And called a
"Cheetah-Q" 
	>and the 3100/M90 is called the Cheetah, so presumably its the
3100/M90 with 
	>the addition of the Qbus interface.

	The VAXstation 4000/90 stuff often gets confused - not least by me
:-)
	(I've had a VS4000-90 on my desk for quite a while ... only when I
finally
	twigged that it claimed to be 83MHz did I realise that it was a 
	VS4000-90A ... the badge on the front has not indication)

	The VAXstation 4000 Performance Summary (EC-N0857-51)
	has the VS4000-90 clocking in at 32.7 SPECmarks and
	about 32VUPs. It indeed has a 72MHz clock (well 71MHz according
	to the doc ...) and a cycle time of 14ns. The backup cache is 256KB.

	The VAXstation 4000-96 (the fastest VAXstation ever made I think) 
	has a 10ns cycle time but I have no information about a VUP 
	rating ... 40 seems perfectly believeable.

	The VAX 4000-100 uses a 72MHz 14ns NVAX (same as the
	VS4000-90) but with only 128KB backup cache. The
	VAX 4000-100A is (IIRC) the same hardware but with
	a duaghtercard on the CPU module that allows access
	to a few more SHACs to improve I/O capacity.

	The VAX 4000-100 and the MicroVAX 3100-90 are identical.
	The motherboard is the same. It can be persuaded to adopt one
	or other personality with the appropriate console TEST command.
	To actually use the DSSI or Q-bus of the VAX 4000-100 you do
	need the right enclosure.

	Similarly the VAX 4000-105A is a MicroVAX 3100-95, the
	VAX 4000-106A is a MicroVAX 3100-95, the VAX 4000-106A
	is a MicroVAX 3100-96 and the VAX 4000-108A is a 
	MicroVAX 3100-98. (This is the only case I can recall
	where changing the CPU personality changes the KA number).

	Antonio