[Tom's Hardware] PCI-SIG Releases Final PCIe 5.0 Specification - Overclock.net - An Overclocking Community

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[Tom's Hardware] PCI-SIG Releases Final PCIe 5.0 Specification

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post #1 of 29 (permalink) Old 05-31-2019, 01:18 PM - Thread Starter
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[Tom's Hardware] PCI-SIG Releases Final PCIe 5.0 Specification

Source: https://www.tomshardware.com/news/pc...pec,39521.html

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The PCI-SIG organization today released the final PCI Express 5.0 specification. The new interconnect standard doubles the bandwidth to 32 GT/s per lane less than two years after PCIe 4.0 debuted. PCI-SIG members can download the full specification from the organization's website.

PCI-SIG Chairman and President Al Yanes said the standard was completed in 18 months. "New data-intensive applications are driving demand for unprecedented levels of performance," Yanes said in the announcement. "The PCIe architecture will continue to stand as the [de facto] standard for high performance I/O for the foreseeable future."

Via an x16 configuration, PCIe 5.0 allows up to 128 GB/s bandwidth, twice that of PCIe 4.0.
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post #2 of 29 (permalink) Old 05-31-2019, 01:48 PM
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i think they need to revise the PCIe slots, the physical slots i mean.
the current slots is limited by it's power capacity and mechanical strength, some companies had tried to compensate for the latter but the former needs an overhaul.

they could technically make the new slots backwards compatible.
if you take note of the PCB cutout of the pins, theres a small unassigned stubble in front for the purpose of disallowing the card to plug into a PCI slot.
this stubble could theoretically be used for the extra power pins.

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post #3 of 29 (permalink) Old 05-31-2019, 02:43 PM
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Quote: Originally Posted by epic1337 View Post
i think they need to revise the PCIe slots, the physical slots i mean.
the current slots is limited by it's power capacity and mechanical strength, some companies had tried to compensate for the latter but the former needs an overhaul.

they could technically make the new slots backwards compatible.
if you take note of the PCB cutout of the pins, theres a small unassigned stubble in front for the purpose of disallowing the card to plug into a PCI slot.
this stubble could theoretically be used for the extra power pins.
I think the limitations may be in how much power they can run through the interconnects through the board itself without interfering with all the data transfers. Some motherboards already have supplimental power connections for graphics cards on the board itself.


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post #4 of 29 (permalink) Old 05-31-2019, 05:06 PM
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Quote: Originally Posted by epic1337 View Post
i think they need to revise the PCIe slots, the physical slots i mean.
the current slots is limited by it's power capacity and mechanical strength, some companies had tried to compensate for the latter but the former needs an overhaul.

they could technically make the new slots backwards compatible.
if you take note of the PCB cutout of the pins, theres a small unassigned stubble in front for the purpose of disallowing the card to plug into a PCI slot.
this stubble could theoretically be used for the extra power pins.
Agreed. They ought to revise the slot to carry 150w. That would allow *most* AICs to not need any supplemental power whatsoever, and high end GPUs and such could easily get by with a single supplemental cable.

That said, the change should be a lengthining of the slot, rather than adding pins to the key notch. This will allow newer cards to continue being used in older motherboards rather than the other way around, which is prefrable, as that is the direction most users will move. (people will be putting new GPUs in their last-gen mobos, for a few years, but almost no one will ever put an old GPU in a new motherboard).

It could also allow *limited* compatibility even in the case of new AIB in old mobo, so long as the area where the new power pins goes is not physically obstructed on the board. The first few years of new AIBs would require the option of being powered via the slot OR supplemental power in order to compensate for the potential of plugging a new card into an old board, but that's an easy comportmise that will resolve itself naturally after a few years.

Quote: Originally Posted by DNMock View Post
I think the limitations may be in how much power they can run through the interconnects through the board itself without interfering with all the data transfers. Some motherboards already have supplimental power connections for graphics cards on the board itself.
No the problem is backwards/forwards compatibility. By adding more pins *anywhere*, they would be forcing the loss of compatibility in one direction or other going forward. Personally I say that's ok, as its been a VERY long time since the physical slot has changed, and no one in their right mind is going to be using 2003 AICs in a 2021 mobo or vice versa.

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post #5 of 29 (permalink) Old 05-31-2019, 05:58 PM
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actually the stubble in front being utilized for powerpins would still allow backwards compatibility in both ways.
that stubble doesn't have a trace whatsoever and is only used to block the card from slotting into PCI slots.



so you'd have two directions this could be plugged.
old card into new slot would only mean the stubble with insert half-way into the slot, no physical contact on the slot's pins.
new card into old slot would leave the now longer and pinned stubble dangling in the air, a plastic protection cap could be applied to prevent short-circuits so theres no issue in this regard.

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post #6 of 29 (permalink) Old 05-31-2019, 06:03 PM
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AMD could add it to the next threadripper. All it would require is an updated I/0 Die.

Even x570 could get a bios update to partially add pcie 5.0. Just as pcie 4.0 was enabled on x470/x370.

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post #7 of 29 (permalink) Old 05-31-2019, 06:19 PM
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Quote:
The new interconnect standard doubles the bandwidth to 32 GT/s per lane less than two years after PCIe 4.0 debuted.
says nothing about the 3.3v and 12v.

maybe need the "key words" pointed out?
Quote:
interconnect, bandwidth
sorry about your aesthetics guys, but external cables (molex/peg connector) provide 2x to 5x the power a motherboard feasibly can deliver.

its just incoming pretty gold connectors, to put it vastly simplified.

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post #8 of 29 (permalink) Old 05-31-2019, 06:47 PM
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Most GPU's don't even need more then a single 8pin anyways. As a single 8pin can provide up to 400w. As long as you have a good quality PSU.

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And people are mad about the cooling needed for 4.0. Once this hits boards, it'll probably be worse.

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post #10 of 29 (permalink) Old 05-31-2019, 08:24 PM - Thread Starter
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Quote: Originally Posted by m4fox90 View Post
And people are mad about the cooling needed for 4.0. Once this hits boards, it'll probably be worse.
The issue isn't PCI-e 4.0 it's due to the chipset being 14nm and 11w, even Intel's C621(15w) chipset requires active cooling.

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