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I have a one-year-old iMac with 8GB RAM running a bootcamped Windows 7 Ultimate 64 bit.

The following memory analysis with Sysinternals RamMap.exe leaves some questions open:

enter image description here

What could be the reason for the nearly 5 GB of memory in the Nonpaged Pool? How can I find out which driver is causing this huge memory usage?

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!poolused 2 and poolused 3 with WinDBG can reveal this; although you seem to have found a native approach in the Task Manager, good job! – Tom Wijsman Dec 15 '12 at 13:55
up vote 5 down vote accepted

Found it, you can add the column "NP Pool" to the "Processes" tab on Task Manager:

enter image description here

In my case, the culprit was Fling File Transfer, which has a serious memory leak. It was using more than 2 GB of the nonpaged memory pool before I restarted it. The above screenshot shows it after running for two minutes.

Bug report filed.

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Thanks so much for sharing that! Everything else I'd found online involved way too many steps. I much prefer your solution, which immediately revealed the guilty process. – Joe M Sep 3 '13 at 13:29
I'm glad that you found a solution, but note that, "the Non-paged pool area seen under RAMMAP is not the same as the non-paged pool usage observed from task manager." From: – user279845 Dec 6 '13 at 18:41
Okay, maybe the numbers don't correspond one-to-one, but it surely helped my find the process which was responsible for the high NP memory usage. – cheeesus Dec 8 '13 at 10:07
I have Nonpaged Pool of 4GB in RamMap and the largest NP Pool in Task Manger is 1MB. What now? – bradvido Oct 1 '14 at 14:05
You have to show all users' tasks in Task Manager. See… – cheeesus Oct 1 '14 at 14:07

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