Topic: Motherboard designed for mining, and better riser cables in this thread. (Read 63341 times)

No all 4 risers do not need to be powered from the same supply.  You can have one feeding the two in the case for the risers and the cards and another feeding the two on the stand and their risers

Okay, I've been looking through this thread and others and keep coming up with different answers. Posting here because i'm seeing actual pictures of an excellent setup.

I want to run a p9x79 pro, 4820k, with 4 r9 290 cards. I know the mobo and cpu are overpowered for this, but I owned them before I decided to mine with them . . and mentioning them here helps me stress that I'd like to not destroy them. I want to use them to mine safely.

Anyways, I have a couple questions about using risers:

I will be using two different single rail 850w power supplies for this type of setup. If I mount them all on risers, do all 4 powered risers need to be powered through one PSU? If so, does it need to be the main psu that I'm using to power the mobo or the secondary psu powering only the two extra GPU's? If different, do the risers have to be on the same PSU as the GPU that is powered (2 risers on each PSU)? I intend to use the powered USB risers that have been linked here.

Alternatively, I already have a comp case . . so can I put two cards on the board in the case and two cards outside of the case on a stand? I'm asking this because I already built a stand that will hold 2 GPU's and the second power supply. I'd like to know if I should just put all 4 cards off the mobo and on the stand (I designed it to fit up to 4 cards, but only has supports for two right now)  . . or if I can get away with 2 in the case and two out? If the split 2in 2out option is ok . . should I still have the two powered risers that I'll be using on the main PSU or the one outside the case? If this isnt safe I have no problems modifying my stand . . but it would be nice to save time if I can do it safely.

Same, I use that exact same riser and have no issues with temp readings.  Usually you will either get all or none, because it shares the data channels for the whole operation of the card.  If you can mine with it, the riser is almost impossible to be the problem. I do remember you need a modified cgminer for the temp display to work with 290s.

You should be getting all signals from the GPU with the USB risers. I've had a few cards that didn't always do it, but the gpus were usually on the way out.

Hey;

I also use a powered usb riser a different model this one:

Am wondering are you getting the gpu fan speed and temp?

You should throw those away and get some USB risers. That's just silly.

I bought some 30 cm risers from hash rate store, and I think that the risers are the weakest link. I would experience on bootup of the motherboard, a single r9-290x would all of a sudden have the fan spin up to max and the computer would hang in the middle of booting up, requiring a hard restart.  After fiddling with the risers for a while, I wrapped aluminum foil around the cable, and then placed plastic wrap over that to prevent shorting.  Seemed to help a lot, eliminating the hang on boot problem, but i also noticed that just moving the riser cable a little before bootup could also cause the boot hang to happen.

Yes

can i use those PCI-E 1x usb riser on a 16x PCI-E port? thanks!

hmmmm........and for what reason?

I got a rig running without power (Molex) to the motherboard (Asrock H81 pro BTC) without powered risers with 5 R9 280X.

@pontiacg5
You got the sexiest rig I've seen so far! Awesome work dude!

Good to know that!

Thanks!

I went to your site when I saw it in another post on here.
I hope to order a couple of the 40" ones the end of next week.
Thanks for having reasonable prices I really appreciate.  I don't have much money so I have to stretch what I do have.

Or even on ebay, mine are the cheapest ones in the USA !! 
 
I even have a bitcoin payment site, www.magicgrowing.com and www.bitcoingrowing.com

What the heck, don't link to those overpriced ones!! Go to my website, only $20 each!

Thank you.  Just what I was looking for.
I appreciate it.

Yes here:
http://www.ebay.com/itm/Powered-PCI-Express-PCI-E-1x-to-16x-Riser-Flex-USB-Extender-Sata-not-Molex-1foot-/171237263210?pt=LH_DefaultDomain_0&hash=item27de89476a

Anyone have a good link to powered USB risers for GPU's?
The link here shows an ended auction. 
Also if it is a US or Canadian seller it would be great.
Thanks

ADL mismatch is a bug in cgminer 3.7.2 for the R9 290(x). New sgminer 4.0.0 has bugfixes to fix it!

If I decide to use my GA-Z87X-UD4H mobo with the additional power through a SATA power connector with 2x 7950s

If I wanted to add 2 more 7950s or 4x 7850s, would I need powered risers?

Also, I currently run the 2x 7950s on an Seasonic X850. How many watts would I need if I added 2x 7950s or 4x 7850s?