Two questions regarding memory on ISR 4321 routers

[Can_networking]

I am expanding the hardware on a ISR 4321 router.

1) Question: What is the maximum memory allowed in the DRAM socket ?

I am seeing conflicting answers:

• The specifications site says a 4GB DRAM maximum in the memory socket.
• One white paper says the router can support 4-12 GB total, implying that 4GB or 8GB DRAM can be used in the memory socket

2) Question: Is there anything special about DRAM used in the 4321 ?

(e.g, I know Cisco routers & switches cannot use generic SFPs, you need Cisco branded SFPs)

My understanding is a generic (non-Cisco) 4GB (or 8GB), DDR3, ECC, 1600 MHz should work.

I already tried a 1333 MHz part and got an error message on boot-up. I assume this is to be expected. I am going to try a 1600 MHz later today.

[Leo Laohoo]

For ths 4321, Maximum DRAM is 8 Gb.  

Only use Cisco-branded memory or else you'll have grief.  

[Can_networking]

Leo,

You are absolutely right, when I used Cisco branded DRAM on my unit, the expansion memory was recognized and the bootup error message went away.