IE 32-bit vs IE 64-bit

We have a Windows server 2012 R2 that we are using to virtualize a Windows 2008 R2 server via Hyper-V.

In the users RDP sessions I have noticed that they are running both the 32 and 64 bit version of IE.  I have been told that to optimize performance and to take advantage of the multiple threads of our hexacore processors, we should only run the 64-bit version.   However when I tested running both versions, regardless of the version I launch, I noticed in the task manager that sometimes it loads as the 32-bit version and sometimes it loads as the 64-bit version even if I launch it from the same shortcut.

Does anyone have any ideas if this is controllable or is it due to perhaps some applications/processes requiring the 32-bit version of IE?
amfolksAsked:
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JohnBusiness Consultant (Owner)Commented:
IE 64-bit needs most everything around it to be 64-bit and this goal remains impractical. Accordingly, I just use IE 32-bit and it works as well as 64-bit. I have not seen performance issues. So in answer to your last question, yes, some applications/processes require IE 32-bit, so just use that version and do not use IE 64-bit.

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serialbandCommented:
It may partly have to do with plugin support.

https://answers.microsoft.com/en-us/ie/forum/ie8-windows_other/ie64-not-accepting-internet-add-ons-ie32-does/ca106f81-05b1-45a5-9a71-cf89c2ffedc4?auth=1

I'm sort of annoyed that it's taking so long to move entirely to 64 bit apps in Windows, especially within Microsoft itself.
David Johnson, CD, MVPOwnerCommented:
The standard rule is still to use the x86 versions (ie/office) due to comparability issues with x64 versions.
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Windows Server 2012

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