PCIE Splitter help

[phongle123]

I have a microATX board but I am now going into to build it in a full size case. 

 

The board only has 3x 16 lane PCIE Slots but I want more more additional stuff.

 

My friend told me that if I get a 4 way splitter with a 1 pcie bus looking connection (even if if plug it into a 16 pcie bus lane) it would split the speed 4 way and the be like .25 pcie bus.

 

Does that mean that I have to buy a PCIE Splitter that is 4 pcie bus so it splits into 1 each? Or am I wrong?

 

Initially I was looking at this http://www.ebay.com/itm/112458637432

 

Example of what I want to extend into the splitter. Capture card, WiFi Card, additional M.2 connectivity. If it matters.

[bcguru9384]

not adviceable unless your shooting for an usb3.0 port to be added and even then you would want a external power option for the usb

might work ok for pciex1 to 2to4 pci(oldschool)slots but even this gonna be glitchy

be best to get a usb hub and get usb devices

but your system your money your time

good luck either way

[mariushm]

The pci-e slots can have a number of lanes that's different than the actual size of the slot.

 

Your motherboard may have 3 x16 slots, but that doesn't mean you have 48 lanes in total.

 

In fact, most likely the first two slots are x16 physical, but when you insert two video cards in those slots, probably both will switch to x8 (because 16 lanes are shared between those two slots)

 

Also, some slots are created by the chipset, which is connected to the processor through a connection with limited speed, let's say something equivalent to a pci-e x4 link.

That means the sata controller (all the hard drives,), the usb ports , the extra pci-e slots created by the chip[set all share this channel of communication that has a maximum speed of (around) pci-e x4 (4 GB/s)

So if your third pci-e x16 slot is created by the chipset, it's most likely physically only x4  and those 4 lanes along with maybe a lane in a pci-e x1 slot and the lanes used by onboard sound card and network card are created by the chipset.

Your third pci-e slot could also be a pci-e v2.0 x4 slot in a x16 format, which means that the speed of each of those lanes is only 500 MB/s in both directions, compared to pci-e v3.0 which is around 980 MB/s per lane.

 

Those adapters are kind of like toys, I wouldn't trust them.

 

Note that a wireless network card or an ethernet network card (wired) could very well work with a pci-e x1 slot , because even if it's pci-e v2.0 x1, the 500 MB/s in either direction are fine for a gigabit network card (which tops at 125 MB/s) or a wireless card that won't get close to gigabit speeds. 

However, a capture card will typically transfer RAW image frames, so if the capture card has a x4 connection, you can be fairly sure it's going to use all those 4 lanes. If you're going to shove it into a x1 slot (or restrict the number of lanes to x1) you probably won't be able to capture stuff.

 

[Electronics Wizardy]

Just now, phongle123 said:

WiFi Card

do this over wifi

 

Just now, phongle123 said:

, additional M.2 connectivity

just use standard sata drives.

 

Id stay away from that splitter

[phongle123]

32 minutes ago, mariushm said:

Snip

 

The motherboard has, 2 PCIe 3.0 x16, 1 PCIe 2.0 x16.

 

Is there any pcie-splitter you could recommend that isn't in the area of a new motherboard but is also reliable? I basically need 4 pcie lanes, but the MB only has 3. So I need a splitter that has at least 2 pcie lanes since 1 of the 3 original lanes would use the splitter.

 

If the pcie splitter is anything like the link I showed it would be possible to use the 2nd pcie lanes rather than the 3rd to make it work.

[mariushm]

what's your MB model and who makes it?

 

no, hose splitters suck, wouldn't use them