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Guru3D.com » News » PCI-Express 4.0 to Double Bandwith and Allows for 300W Slot Power

PCI-Express 4.0 to Double Bandwith and Allows for 300W Slot Power

by Hilbert Hagedoorn on: 08/22/2016 01:17 PM | source: | 36 comment(s)
PCI-Express 4.0 to Double Bandwith and Allows for 300W Slot Power

Some info on the up and coming PCI-Express 4.0 slot is spotted on the web. now it's not that you guys would need faster PCI-Express slots as really, you are hardly utilizing PCI-Express 3.0 (or even gen 2.0). But interesting is that the new slot will allow for 300 Watt slot power, that's a massive increase over 75 Watt.

Update:  It was indicated that the motherboard slot would be capable of delivering 300 Watts through the PCI-Express slot, this is erroneous as it will remain to be 75 Watt, much like it is these days. More info here.

--

The news reaches us through techpowerup, who stumbled into it at TomsHardware. But yeah, basically bandwidth is at 16 GT/s per PCI-Express lane which is double that of the 8 GT/s on the current PCI-Express gen 3.0 specification.

PCIe VersionLine CodeTransfer Ratex1 Bandwidthx4x8x16
1.0 8b/10b 2.5 GT/s 250 MB/s 1 GB/s 2 GB/s 4 GB/s
2.0 8b/10b 5 GT/s 500 MB/s 2 GB/s 4 GB/s 8 GB/s
3.0 128b/130b 8 GT/s 984.6 MB/s 3.938 GB/s 7.877 GB/s 15.754 GB/s
4.0 128b/130b 16 GT/s 1.969 GB/s 7.877 GB/s 15.754 GB/s 31.508 GB/s

If you multiply then 16 GT/s per lane bandwidth translates into 1.97 GB/s for x1 devices, 7.87 GB/s for x4, 15.75 GB/s for x8, and 31.5 GB/s for x16 devices. PCI Express has moved well beyond video cards. Currently, nearly every IO device routes through PCIe to send signals back to the CPU. We expect to see rapid adoption of the new standard for storage and networking products. NVMe SSDs using PCIe 3.0 x4 recently reached the usable limit of the interface.

As satted the 4x increase in power delivery I find to be very interesting as it actually might eliminate cables going towards graphics cards (of course we'd all need a PCIe Gen 4.0 motherboard which will never happen). 

Check the slides below for a good read.



PCI-Express 4.0 to Double Bandwith and Allows for 300W Slot Power PCI-Express 4.0 to Double Bandwith and Allows for 300W Slot Power PCI-Express 4.0 to Double Bandwith and Allows for 300W Slot Power PCI-Express 4.0 to Double Bandwith and Allows for 300W Slot Power PCI-Express 4.0 to Double Bandwith and Allows for 300W Slot Power PCI-Express 4.0 to Double Bandwith and Allows for 300W Slot Power




« PS4 Slim Leaked - Kind Of .. · PCI-Express 4.0 to Double Bandwith and Allows for 300W Slot Power · Review: MSI GeForce GTX 1060 Gaming X 3GB »

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poornaprakash
Member



Posts: 94
Joined: 2008-06-25

#5324671 Posted on: 08/22/2016 02:05 PM
Is such a high bandwidth really necessary? Even a 2.0 is not bottlenecking any card.

I would understand if multi-gpu is the future but users seems moving away from that.

For gaming purposes PCI-E 2.0 is still more than sufficient but for Compute purposes more bandwidth is required. It may be surprising to know that even a HD 7970 had higher compute performance when running on PCI-E 3.0 compared to running on PCI-E 2.0.

http://www.anandtech.com/show/5261/amd-radeon-hd-7970-review/10

nick0323
Senior Member



Posts: 1026
Joined: 2010-02-24

#5324674 Posted on: 08/22/2016 02:10 PM
Yeah happy with my mobo/cpu - rock solid stability and performance, for gaming obvs.

JonasBeckman
Senior Member



Posts: 17563
Joined: 2009-02-25

#5324685 Posted on: 08/22/2016 02:31 PM
Is such a high bandwidth really necessary? Even a 2.0 is not bottlenecking any card.

I would understand if multi-gpu is the future but users seems moving away from that.

PCI-E SSD I guess? :D
(The M.2 or what it's called featured on more recent motherboards might be better though and not you know block other components relying on PCI-E slots but eh I guess newer motherboards offer a bit more choice what with more lanes or how it's called and better spacing for the larger board models.)

Evildead666
Senior Member



Posts: 1309
Joined: 2003-09-14

#5324692 Posted on: 08/22/2016 02:56 PM
Am I missing the slide that mentions about the 300W via the slot ?
I don't see it in the collection ?

AlmondMan
Senior Member



Posts: 997
Joined: 2007-09-03

#5324697 Posted on: 08/22/2016 03:06 PM
AMD was really just ahead of the times with RX480!

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