Question about risers??

[zollman]

So what is the point in using a 1x pcie to 4x pcie multiplier riser and running 4 gpu from 1 pcie slot vs using a single rirser in each pcie slot??   When I first saw those multipliers I thought you could pump up the number of gpus on your board dramatically. But no. Obvioulsy you are limitsd bu the mobo chipset and bios., And since all the boards I can find that support multi gpu also have 1 pcie slot for each card the support.,  So... Yeah, whats the point? 

[adaseb]

So what is the point in using a 1x pcie to 4x pcie multiplier riser and running 4 gpu from 1 pcie slot vs using a single rirser in each pcie slot??   When I first saw those multipliers I thought you could pump up the number of gpus on your board dramatically. But no. Obvioulsy you are limitsd bu the mobo chipset and bios., And since all the boards I can find that support multi gpu also have 1 pcie slot for each card the support.,  So... Yeah, whats the point? 

It's worth it because depending what motherboard you are using you can get an extra GPU or 2 or 3.

You need to do research however because depending on the chipset they might not work at all.

It helps because it saves money in motherboard, CPU, hardware , and ram costs. And also saves physical space.

[zollman]

Thanks for the quick reply., I knew it had something to do with the pcie lanes available on the chip set, yet even if the chip set has 30 pcie lanes they are used by usb ports (including on board risers) as well as many other mobo features and if there are any left over they might not be turned on in the bios.,

Is there any reliable place to find the info needed for a certain board? Or could you tell me specifically whats needed and ill do the digging for the boards I have. 

Thanks again!

[jmigdlc99]

Not saying this to discourage you by all means research all you want, but from my experience it would be better to just simply buy an ASUS mining expert motherboard that can support up to 19-GPUs. If your goal is to get better power efficiency by increasing the density or number of GPUs connected to a single board, then PCIE riser extenders are not the way to go.

As you've found out, motherboards are limited by their lanes/chipsets/whatever, but more than that, stability of multi-extended mining rigs is questionable (unstable). As far as i know extenders are useful only for normal/gaming motherboards that only have a few PCIE slots, and is still limited in the maximum number of extenders added.

[leonix007]

Thanks for the quick reply., I knew it had something to do with the pcie lanes available on the chip set, yet even if the chip set has 30 pcie lanes they are used by usb ports (including on board risers) as well as many other mobo features and if there are any left over they might not be turned on in the bios.,

Is there any reliable place to find the info needed for a certain board? Or could you tell me specifically whats needed and ill do the digging for the boards I have.  

Thanks again!

Simply look at your mboards chipset and CPU/type model, you may now search it how many PCIE Lanes available for them

sample on this link

https://silentpc.com/articles/performance-and-pci-express-bus-lanes

[crocozino]

ok, I will tell you were it really helps!
I have bought asrock ab350 pro4 mainboard, cause I wanted to try ryzen cpu..
I knew that it was able to handle 6 cards, cause same board was handling 6 amd rx570 in my friend's house.
but sadly! when I instelled there 6 NVIDIA cards it failed... cause it can support only 3 nvidia cards... that was the case when this small extender saved me

[solidrock]

1. Saves money
2. Computer and Ram
3. Saves space

[NiklasFalk]

Flexibility means you can use many more that the special-always-of-of-stock Mobos to use 9-13 GPUs even without M2 adapters.

You are limited to the number of Hi IO-lanes the board uses for other things than graphical cards (remember, Mining expert can handle 13 Video cards and 6 mining cards, not 19 cards with video out).

I did not have an extra card to test my mini-budget rig with QC5000M with a splitter for 6 cards, but it worked nicely with 5 (miniATX with 3 slots). The APU can mine a little as well :-)