PCI-e bandwidth/capacity limitations

[ComputerGenie]

...
2.2. is "premium" Termaltake riser realy good for folding?
i know about 3M risers, they are perfect, but too expensive for just risers

Save $ and get something like: http://a.co/jfI80yM

[SteveWillis]

Save $ and get something like: http://a.co/jfI80yM

At least two reports of ruined motherboards from these in the reviews? No I don't think so. Quality powered risers are hard to find but you can tell these are quality just by looking at them.
http://www.ebay.com/itm/261459534757?_t ... EBIDX%3AIT
I have two with no problems. You get what you pay for, at least on a good day.

if you are looking specifically for unpowered risers I like these but they are out of stock right now.
https://smile.amazon.com/gp/product/B01 ... UTF8&psc=1

[ComputerGenie]

Save $ and get something like: http://a.co/jfI80yM

At least two reports of ruined motherboards from these in the reviews? No I don't think so...

I'm not sure how much I ever trust "customer reviews" on any site that allows novices to buy and review electronics. That aside, my point was simply that shielding is overkill. Personally, I have plain old dual-ribbon 16x-16x that I clipped and added power myself, which I got for $6 per.

[bruce]

On one system, my MB has room for two double-slot x16 devices plus a couple of single-slot x1 devices. I have two double-wide GPUs in the x16 slots and I wanted to add another GPU to use the x1 slot. I'm using one of the risers that converts a x1 PCIe slot to USB and back to x16 (something like this) which allows me to leave the GPU outside the case. I put the slowest of the 3 GPUs in that slot, assuming that it would need the lowest share of the total bandwidth. I suspect that it might fold a little faster if it was provided with a x8 or better slot, but my CPU doesn't have enough lanes for that and it's getting more than it was sitting on the spare parts shelf.

I did try some plain wired risers and had some troubles, but they'd probably work except for the fact that I needed the extra length of the USB cable to reach outside of the case.

I still have another x1 slot to try later.

[boristsybin]

Save $ and get something like: http://a.co/jfI80yM

already waiting for a couple of similar cheap risers, and i also ask about them

2.1. is cheap non-shielded pci-e x16-x16 or pci-e x16-x4 20cm riser enough to provide stable folding at pci-e 3.0 standard? if not, does handmade aluminium foil shield helps?

[ryoungblood]

FYI, those unshielded risers have a chance to drop your PPD. There is an ongoing discussion of this in the Overclockers.com Folding Forum. The EZDIY risers from Amazon are great. They have smaller ones that are in stock.

[ComputerGenie]

FYI, those unshielded risers have a chance to drop your PPD...

I had my GTX 1080s on an M5A99FX PRO (purchased for reasons unrelated to folding) and there was no discernible difference between with unshielded risers (even when laying directly on each other) and directly in the slots; so, I guess ymmv.

[foldy]

I guess it depends on slot speed, gen3 x16 with risers reducing bandwidth by half doesn't hurt. But the same on gen3 x4 bandwidth and PPD goes down.

[SteveWillis]

My apologies as I imagine this has been answered before but I can't find it. With a 1080 TI what, if anything, do you lose with pcie V2 vs V3?

[Nathan_P]

at x16 maybe 1-2% depending on the project.

[SteveWillis]

at x16 maybe 1-2% depending on the project.

Thanks Nathan_P!

[Sven]

These Graphiccards are specially made for mining.

Eventually there also interesting for Folding@Home, depending on the pricepoint.

https://www.techpowerup.com/234113/nvid ... their-gpus

[Sven]

And that's how one look like:

https://videocardz.com/newz/first-look- ... ng-station

[Aurum]

Horrible idea!!! Miners will take these and overvolt and overclock them and burn them up. Never buy one used as it will be near death. I've yet to see they offer any benefit for folding.

[Aurum]

Save $ and get something like: http://a.co/jfI80yM

At least two reports of ruined motherboards from these in the reviews? No I don't think so. Quality powered risers are hard to find but you can tell these are quality just by looking at them.
http://www.ebay.com/itm/261459534757?_t ... EBIDX%3AIT
I have two with no problems. You get what you pay for, at least on a good day.

if you are looking specifically for unpowered risers I like these but they are out of stock right now.
https://smile.amazon.com/gp/product/B01 ... UTF8&psc=1

I've fried two motherboards using a new powered riser. I didn't realize the riser was the problem and tried it on a second mb.
Too bad there's not a tester.
The blue tape is just there to hide the terrible Chinese workmanship. The cables are soldered off center and at an angle to connector plug. From what I've seen there appears to be no QA or inspection process whatsoever, just pack'em and ship'em.
When I get a new unpowered riser I lay it flat on my workbench and peel off the silly blue tape. I inspect both sides with a magnifying glass for shorted neighbors and broken connections, if any then trash. If not, I squeeze on a thick coat of Locite Vinyl, Fabric & Plastic transparent adhesive and leave it sit for a day to cure. Then I test it on an old rig.
Bending a riser at the ribbon cable connector joint is very likely to break solder joints or even the wire. The ribbon cables are way too stiff for this function and not meant to be bent.