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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.
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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 Version | Line Code | Transfer Rate | x1 Bandwidth | x4 | x8 | x16 |
|---|---|---|---|---|---|---|
| 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.
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Senior Member
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Joined: 2005-09-27
ill take my clean power straight from the PSU, thanks. i dont mind routing cables.
i think this is most interesting from a storage standpoint. the connector specs on the last slide, for instance...otherwise, the bandwidth almost seems to be a waste.