See the information linked below:
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Thanks for the reply. However you linked me to a generic RAM memory controller. That is not what I was asking about. I was asking about a 'PCI memory controller'. I believe it may be related in functionality to Robson/Intel Turbo RAM - just a newer incarnation.
In particular, there is the following description from the link which seems to indciate the PCI connection:
The Turbo memory cache connects to a motherboard via a mini-PCIe interface. It supports features available in Microsoft Windows Vista, namely ReadyBoost (a hard-drive caching solution via flash memory) and ReadyDrive (a hard-drive caching solution via hybrid drives). These features allow both read caching and write caching of data. Often this is implemented with a Disk Filtering Option ROM (DFOROM)..
I would just like somebody familiar with this area to confirm my hunch.