Topic Title: Optic fibre in CPUs
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Created On: 12/14/2012 08:28 AM
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 12/14/2012 08:28 AM
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McAbre
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So I been thinking for some time that optic fibre would be very effective in CPUs and then I wondered, why aren't anyone making them? So now I've turned to you guys? Why aren't you making CPUs using optic fibre instead of whatever material you use now? And I think this would be something for AMD to go for now as you have fallen quite far behind Intel.

 12/14/2012 08:43 AM
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black_zion
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The same reason they don't make car brakes out of aluminum.

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 12/14/2012 12:22 PM
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MD - Moderator
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Intel has been doing it or researching it since 2009...

IBM has their Holey Optochip.

There are IEEE articles regarding this from 2002.

Even at this point they are mainly research topics.

 

Makes sense in giant server farms, but not in a SOHO setup.

 

Plenty of reading here:

http://www.google.com/#hl=en&safe=active&tbo=d&sclient=psy-ab&q=optic+interconnects+in+cpus&oq=optic+interconnects+in+cpus&gs_l=hp.3...2715.7723.0.8668.29.28.1.0.0.4.1444.8185.0j13j9j2j0j3j0j1.28.0.les%3Bernk_timediscountb..0.0...1c.1.jASFmbAQLcA&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&bvm=bv.1355325884,d.cGE&fp=1a3768278019f5af&bpcl=39967673&biw=1660&bih=900



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 12/14/2012 01:01 PM
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Mime
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The optical interconnect will allow a CPU to send signals at the speed of light! 

Ok, seriously... that's not why people are interested in optical interconnects.



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 12/14/2012 01:48 PM
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black_zion
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And with high performance applications moving to a GPU, the importance of a monolithic Über high performance CPU is decreasing.

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 12/14/2012 04:34 PM
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Mime
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Not really the same deal dude... they both have copper interconnects now... there's no reason that I know of why the interconnects in CPUs and GPUs would have to be different.

Also, GPU computing works best for data parallel applications.  There's a lot of stuff which doesn't fit into that group, so there's still going to be plenty of CPU intensive tasks out there.



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 12/14/2012 05:07 PM
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black_zion
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That's why I said High Performance, the HPC sector which currently is dominated by Tesla with a few Fire based ones in there. No argument that computers even up to the university grade will mostly be CPU only for years to come, but even today's Über CPU's, the Intel Xeon Phi's, aren't really necessary in many cases.

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 12/14/2012 07:52 PM
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Mime
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The point was, some apps probably won't ever make use of GPU computing, because they wouldn't benefit from it.  Some applications will even show a performance decrease when run in parallel compared to serial execution.  It's not a question of resources... it's just the inherent behavior of the software.

Square peg vs round hole... pushing harder doesn't make it work any better.



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Edited: 12/14/2012 at 08:45 PM by Mime
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