[HN Gopher] Fast GPU Interconnect over Radio
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       Fast GPU Interconnect over Radio
        
       Author : montroser
       Score  : 81 points
       Date   : 2025-12-29 03:39 UTC (19 hours ago)
        
 (HTM) web link (spectrum.ieee.org)
 (TXT) w3m dump (spectrum.ieee.org)
        
       | Animats wrote:
       | Tiny waveguides in cable form. Cute.
        
         | qeternity wrote:
         | As someone with no experience in the domain, this sounds really
         | interesting.
         | 
         | But one of the companies mentioned has been attempting this for
         | 9 years.
         | 
         | Why hasn't this taken off already? It doesn't seem we're in
         | need of any breakthroughs. So where do the economics break
         | down?
        
           | kristjank wrote:
           | Precision manufacturing at scale. The physics of merging a
           | hundred-gigahertz-scale circuit board track into a waveguide
           | are very unforgiving. The physics governing the tolerances of
           | said waveguide are similar.
        
       | fancyfredbot wrote:
       | Very clever stuff. I wonder how their power consumption compares
       | to copper with a retimer.
        
       | ajb wrote:
       | For a moment I thought this was actual co-ax, which would be
       | supremely ironic (it was used in the early days of Ethernet, but
       | twisted pair proved cheaper). But it looks like neither candidate
       | has a conductive core, although they do have the conductive
       | shell.
        
         | kristjank wrote:
         | Coax, or more accurately twin-ax is still the underlying
         | technology for Direct Attachment Copper cables for Ethernet
         | using pluggable modules.
        
       | buildbot wrote:
       | It's sorta funny to see one of the companies aiming for terahertz
       | frequencies - long wave IR is only ~30THz.
        
         | throwawaymobule wrote:
         | It'd be nice to see the 'terahertz gap' closed finally.
         | 
         | Not for a practical reason, but it's been on my mind since I
         | randomly found a wikipedia article about it.
        
           | buildbot wrote:
           | Interestingly reading the terahertz radiation wikipedia
           | article they mention peeling adhesive tape generates 2THz and
           | 18THz peaks
        
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