Hi,
For any hardware related queries, we ususally rely on hwu.netapp.com. And I am afraid, PAM (Flash-chace) do not apply to E-SERIES according to hwu site.
Once you are logged into hwu site:
Under Menu:
Under Adapters
1) Search by OS and Model
2) You have options : FAS/AFF/E-SERIES/ETC
3) For E-SERIES : Adapter section do not show 'PAM', however for FAS, depending upon the Model and OS, it does show the PAM.
I think E-SERIES only supports SSD Cache pooling but no PCI-e card.
For SSD cache size:
https://kb.netapp.com/app/answers/answer_view/a_id/1000942
Thanks!