Either the articles your read are wrong or you may have misinterpreted them. The Kona and BM cards are not hardware accelerator cards, they are capture cards. They cannot “help process more layers and or effects in Real TIME.”
However, they can be used to convert video to various formats on the fly while capturing that may, in some instances, give you better realtime performance, and that can enable you to edit more streams or layers. For example, you could capture uncompressed SD DVCPro50 or uncompresssed HD to DVCPro100, thereby substancially diminishing the system overhead necessary for those uncompressed formats and thereby substancially increasing layers and realtime capabilities.
Hope this helps…
DRW