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[Condor-users] How to distinguish between 32-bit and 64-bit architecture

I am running a Windows Condor pool which consists of 32-bit and 64-bit hardware. When I submit jobs,
I want to be able to specify on which architecture (32-bit or 64-bit) the jobs should run;
preferably making use of the 'Requirements' operator and some ClassAds information.
However there doesn't seem to be a ClassAds field that corresponds directly to 32-bit and 64-bit architecture.
The 'Arch' field indicates 'INTEL' for all Intel CPUs.
Since all our 64-bit machines are currently i7s, I can probably use (TotalCpus == 8) as a requirement to identify
64-bit architecture, but this doesn't seem very elegant.
Has anyone else had such a requirement before?