How many Physical CPUs Arch Linux Supports?

How many Physical CPUs does Arch Linux Support, the traditional 2?
Can it support 4 or more Physical CPUs, How?
By Physical CPUs I take RedHat deffinition :
Red Hat defines physical CPUs equivalently to sockets, so a multi-core and/or hyperthreading CPU is counted as a single CPU or socket when determining whichedition of Enterprise Linux to deploy.
Thanks

Let's put it this way.
Linux can likely support more cpu's than you can afford.
That is, unless you are super rich..
If that is the case..then by all means.....
....donate!
EDIT: After some peeking around.. I found this.
SGI Altix 4700 incorporates the shared-memory NUMAflex™ architecture, which simplifies software development, workload management and system administration. It supports up to 512 processors under one instance of Linux and as much as 128TB of globally shared memory. Supporting these powerful capabilities is the NUMAlink™ interconnect, which leads the industry in bandwidth and latency for superior performance on cluster applications. The SGI Altix 4700 represents a versatile solution for shared or distributed memory applications of any scale.
Likely SGI has a few tweaks that haven't percolated into the mainline kernel yet (pending or rejected)..But sgi usually pushes the high end mutiprocessor systems..
So.. around 512?

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