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Date: Tue, 16 Jul 2013 23:48:57 -0700
From: Darren Pilgrim <list_freebsd@bluerosetech.com>
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Subject: Re: expanding past 1 TB on amd64
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On 7/16/2013 2:12 PM, Alan Cox wrote:
> ... The Haswell line of CPUs is widely reported to
>> support DIMMs twice as large, and it's due in September.  That would
>> make the systems of late 2013 hold up to 1536GB of memory.

I'd point you at stuff like the Supermicro X8BQ6 series of mainboards. 
QP E5-8800 systems with 1 TB of memory have been around since 2011.