We don't have any comparison with Linux, and a direct comparison would be difficult. For example we are not aware of any disk performance benchmark that would run on both Linux and Windows to make sure we use the same tool on both platforms.
OS support-wise, yes it runs on Windows XP through Windows 10 (client OS) and Windows Server 2003 through 2016 (server OS).
Regarding comparison to SSD, a RAM Disk should be at least 5-10 times faster than a regular SSD drive. Though, as you probably know that it's not a direct replacement, because RAM disks are volatile in nature and are generally used for temporary data.