I want to upgrade SUP 720 DRAM in 7609. Existing are both have 512 Mb of SP and RP. The redundancy mode is SSO and its currently working okay now. I plan to upgrade the standby SUP DRAM first to 1Gb, and then force the router to switchover. And after that, will I continue to upgrade the previously active SUP memory to 1Gb. my question is, after I upgrade the standby SUP, the hardware of those SUPs will be different right? (the active has memory of 512, the standby has memory of 1Gb) So, will SSO work in condition like this?