It is not possible to get a complete accounting of RAM usage on a Windows, but you can get reasonably close. RAM usage by various OS functions is measured by the following five Memory Object counters:
Pool Nonpaged Bytes: these represent allocations directed to the nonpaged pool, which is a set virtual memory pages that always [...]

You are probably looking at the Page Faults/sec Counter and interpreting it as the rate of demand paging. Not entirely. In Windows Server, the Page Faults/sec counter includes both hard and soft page faults. (It also appears to include Cache faults/sec, which are application-related file cache read misses.) Instead of using the Page Faults/sec counter [...]

Hyper-threading (HT) is the brand name for the technology Intel uses in many of its Xeon 32-bit processors that enables one physical processor core to execute two instruction streams (or threads) concurrently. On an HT machine, when HT is enabled, each physical processor currently presents two “logical” CPU interfaces to the operating system so that [...]

Pretty good ones for the most part, unless you encounter one of several possible problems.
Capture ratios deal with the difference between the theory and practice of computer performance monitoring. In theory, since Windows derives all the CPU time measurements from the same data collection mechanism, the following relationship should hold:
S Thread(_Total) % Processor Time = [...]

Look at a combination of processor utilization and processor queuing.
(1) The primary indicator of processor utilization is the % Processor Time Counter in the Processor Object. Note that the _Total instance of the Processor Object is actually the average value over all processors. The System Object in NT 4.0 contains a Counter named % Total [...]