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back to article Insanely great PCIe 4.0 bit rate locked in

The PCI-SIG has settled on a bit rate for its next-generation PCIe 4.0 interconnect specification, and the winner is – insert drumroll – 16 gigatransfers per second, as expected. "Experts in the PCIe Electrical Workgroup carefully analyzed a number of target bit rates for the next generation of PCIe architecture, taking into …

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Paris Hilton

PCIe lanes

Quite a low stat I reckon. On average I'd say there were at least 12 per motherboard shipped these days.

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Laptops ?

And how many lanes does an average laptop have ?

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Boffin

re: Laptops

Again, varies, but they have them. Or at least every Centrino since 2006 has them (the wifi cards usually connect via PCIe, and PCIe generally replaced the Northbridge)

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WTF?

"Forever" and "Who needs more than 640KB RAM"

Sorry, but is history repeating itself?

Build a NAS with more than half a dozen SATA2/SATA3 disks and it's quite easy to start pushing PCIe v2 quite hard, even to the point where it can become an IO bottleneck (ie. typical 8-port PCIe x8 SAS HBA).

PCIe v3 should last a good while, and PCIe v4 that bit longer, but "forever"? I seriously doubt that. Forever is a long time... whatever bandwidth is available we'll find ways to use it all up, and then some.

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Black Helicopters

the length of "forever"

is a finite number. Maybe he knows something we don't.

Locking my bunker door now.

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Pint

Enough is NEVER enough.

"At 8GT/s, PCIe 3.0 is as fast as normal humans will ever need."

Seem to remember a certain Mr Gates saying something similar with regard to computer memory way back - "640K ought to be enough for anybody"

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Boffin

References, please?

Gates denies ever saying such a thing, and a quick google turns up no definitive references to when or where he might have said it.

http://en.wikiquote.org/wiki/Bill_Gates

http://www.computerworld.com/s/article/9101699/The_640K_quote_won_t_go_away_but_did_Gates_really_say_it_

GJC

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I'm sure it must have been some bod at IBM, not His Billness.

But it reminds me of another good quote by David Bradley:

"I may have invented Control-Alt-Delete, but Bill Gates made it famous."

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Transfers?

What constitutes a "transfer"? It is almost certainly not a transaction, unless 4.0 is logically very different from its predecessors. Perhaps "transitions"? or maybe they mean "signal elements", which we used to call "baud" (max signal elements/sec.) before the PC muppets (no disrespect to Jim Henson) decided that every signal was strictly binary. (Hint: take a look how GigE, or even 100BaseT are done)

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Boffin

Use the force, Luke....

If you follow the link embedded in the article, there's a very useful definition of exactly what it means. Raw bits per second per channel, in essence, with a 25% overhead for encoding.

GJC

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Anonymous Coward

Forever...

actually I agree with him...in a fashion....

He may be eluding to the fact that by the time we have even gotten close to it, we have moved onto a completly new bus and architecture, therefore, never actually reaching it's limit.

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Thumb Up

but then again...

I was just at SC11, and we really need faster (lower latency) networks for a whole host of tightly coupled scientific problems. This doesn't sound all bad, if it addresses that issue...

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Trollface

So we are part of the 1%...

... that owns more than 16 PCI-E lanes, and deny other people access to their fair share of lanes !

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