I recently received through F-Secure's support the Policy Manager Server, running on 64 bit. 
All I had to do was install on the 32 bit platform, which is what we have available on the F-Secure website, and choose to keep the settings.
As far as I know, this version is not available for download, not even in the partner portal, because it will be a new release that will be released in June, along with the new version of the product.
I'm using this particular version on 4 clients, and here in my company, using Windows 2012 R2 x64.
Customer 1: 380 machines
Customer 2: 780 machines
Customer 3: 2500 machines
Customer 4: 5500 machines
The difference in performance is significant!
But the biggest difference I realized was actually the customer with 5500 stations (in "only one PMS").
There is no comparison, even using advanced args, in 32bits version VERSUS x64 version, without using advanced args.
I will try to send Link, but i don´t know if is possible, someone request for F-Secure Support 