1000 online pppoe user ,need cpu ? memory ? Network Interface ?
thank s.
Yep…it needs cpu, memory and network cards. 
I am very sorry.my bad English.
Please recommend what kind of CPU and the number of memory?
More than CPU and memory you will need a miracle to handle 1000 pppoe users with Mikrotik.
We have a lot of problem with much less than this per MK router (even using a fast hardware).
We are testing MT x86 for PPPoE termination now. One box has ~800 sessions/~120Mbit/~20K pps with 80% CPU load. Processor is Xeon 2.8 (SMP off because of 3.12 bug, but not a big difference between 3.11 with SMP turned on). MT support told me that in 3.12 they should have simple queue optimizations to lower CPU load, I did not notice. So far customers on this test MT box did not complain about slowness, packet loss, etc - MT runs fine.
In comparison to MT, we use plain linux PPPoE termination boxes with 2000 sessions/300Mbit/80K pps with CPU load about 60%. MT pluses are configuration simplicity, gui and other bells & whistles. Plain linux advantage is performance. Connection tracking is off in both cases.
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Konstantin