WEBVTT

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your PC probably has a slot that looks like this it's a PCI Express x16 slot

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and it's commonly used for graphics cards as it's one of the fastest

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connections on your motherboard even the chunkiest most powerful gpus can be

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handled by a single one of these slots no problem but there is another did you

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know that PCI Express X32 is a real

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thing that actually exists what the heck would you do with a slot that's twice as

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long well to be clear it's very difficult to find slots physically

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bigger than that standard x16 size remember that those numbers when we're

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talking about PCI Express refer to the number of lanes not necessarily the

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physical size of the slot a tiny m.2 SSD

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often uses four PCI Express Lanes even though the connector is quite a bit

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smaller than a regular PCIe X4 sized slot how exactly does PCI Express X32

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work then it turns out that the PCI Express standard doesn't support a

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single link greater than x16 the reason

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for this is because it's very difficult to actually Implement links this wide in

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Hardware you see when you send data down a PCI Express link say to a graphics

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card that data is striped across multiple lanes and doing this is not

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trivial when the data arrives wherever it's going it has to be Des skewed

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meaning synchronized although PCI Express is a Serial interface that

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doesn't require the data on each lane to to arrive at exactly the same time

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synchronizing the data still involves Hardware overhead and once you start

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getting past 16 Lanes it's just too much to keep up with so instead of having one

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big slot these higher PCI Express connections use a trick called driver

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binding essentially this allows multiple PCIe devices to talk to each other and

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coordinate their traffic so they can act as one big device so a PCIe X32 link is

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actually two x16 links mashed together

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in software with the devices installed in two normal x16 slots the performance

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overhead involved with driver binding for X32 isn't too bad but if you were to

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theoretically go up to say x64 you'd

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likely need more Hardware as at that point you just have too many

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transactions for your poor system to handle but wait a sec why the heck would

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you need that much bandwidth to begin with we'll tell you right after we thank

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so your build can stand out plus those

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below now the appeal of having this many PCI Express Lanes isn't so you can do

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something like squeeze more performance out of your graphics card even an RTX

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490 barely improves going from eight Lanes to 16 Lanes on a PCIe 4.0 slot

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instead driver binding is used in applications where all the bandwidth you

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can get is appealing you often see X32

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links in certain kinds of networking cards mostly for server and data center

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use although NVIDIA is obviously known more for gpus and AI they make a line of

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network adapters that supports both Ethernet and another high-speed

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networking protocol called infiniband this product for example goes into a

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standard PCI Express x16 slot but it

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comes with a second auxiliary card with the same connector they work in tandem

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to provide an X32 connection for extra bandwidth in case you're using a

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previous revision of PCI Express that doesn't provide enough bandwidth to take

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full advantage of the network adapter speed there's also a special cable

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connecting them to allow them to share data while taking some of the pressure

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off of the PCI Express Bus itself and

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connecting multiple machines with crazy amounts of bandwidth isn't even a rare

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use case with how much growth we've seen with data hungry cloud services for

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applications like AI gaming and Ultra highdef video data centers are already

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moving towards 400 gabit connections or

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even Beyond that's 400 times faster than

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what you'll find in most Garden variety desktop PCS which is also part of why

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you simply don't need PCI Express X32 in

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your personal rig although I'm sure some of you are already thinking of ways

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you're going to justify your purchase hey thanks for watching this video like

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it if you liked it dislike it if you disliked it check out our other video on

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PCI Express 6.0 comment below with video

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suggestions and don't forget to subscribe and follow to Tech quick the

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