Topic: Bad mining component - risers (Read 943 times)

The only riser I will ever buy

http://www.ebay.com/itm/301894195252?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

They work great and I had a problem on one of them, the seller shipped another out no questions asked.  The problem with that riser was a small solder bridge and i broke the unintended bride with my knife so I have an extra riser now.  The replacement riser they sent was a brand new unopened package.

I bought 2 from the same guy, "kuentl", both USB cables were bad.. I asked him if he would send me a couple of new cables and he wanted video proof LOL.. I'll just ask for a refund.. if he provides prepaid label I'll send them back, otherwise just toss it in the trash. Ebay gives you the money back either way.

Funny, I purchased risers from this guy and they were also DOA: http://www.ebay.com/itm/272233659507?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

I complained but he wanted me to submit video proof!??


The above risers are sold by many. The version number on these is 3.

I am using this:
http://www.ebay.de/itm/371601173117?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

2 of 2 are working

Here's a good one I found, it's the latest, version 6, a bit more pricey but works great:
http://www.ebay.com/itm/182233329507

Anyone know of a place to get good risers? Just got 4 risers from ebay that was dead on arrival.

I have big R9 380s that work very fine with qualitative risers coming from Amazon. Ebay is full of crap so don't get surprised ...

I think risers can  work fine... to a point. What kind of card are you using?  A lower wattage card (like an RX 470 or RX 480) can work just fine with a riser.  If you're pulling some major wattage through a riser... you may be asking for trouble.

Just my two cents....

I've noticed I have the most trouble with the longest ribbon cable risers.  Given that they are transmitting high-speed (>100Mhz) signals and don't have shielded or twisted pairs, there are likely to be signal quality problems.  I've also noticed some types of cards give me more problems than others.  I suspect it has to do with the PCIe bus driver chips(or bus driver circuitry built into the GPU chip).
When I'm having problems with a card I just swap in a USB riser (or put it in the mobo 16x slot) to figure out if the problem is with the card or with the riser.

I have used several kinds of 1X to 16X risers.

This one in particular, is by far the worst: http://www.ebay.com/itm/261433040898?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

I'm in the process of replacing them all. The major fault of this riser is having a card go offline (as in not showing up on aticonfig --list-adapters). If a card goes offline, the miner goes offline usually. Replacing this riser has always cured this fault. This particular riser is also mixed in with other types which makes fault isolation easier.

I've had trouble with a few other risers, but explaining to the relevant ebay seller the technical issues is hopeless. Most of these guys sell hundreds of items and any kind of return is hopeless and not worth the hassle.

I believe the problem with this particular riser is the ribbon cable mechanical attachment at both ends. I believe this particular pressed mechanical attachment results in an uneven contact area. If the contact area is small your jamming  more current through a smaller pipe. My stuff gets pretty warm at midday, so it's also possible that the mechanical connection is oxidizing. The small gauge of the ribbon cable conductors just enhances this problem.

The solution I use is to use risers which are either soldered at both ends or USB based risers. With USB risers you are leveraging a standard that for years has transported high frequencies as well as DC currents.

FYI -  All risers have their own power connection direct to the power supply.