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In an attempt to vet some stability issues I've been having the last few days, I've come to decide my risers could be a contributor (drivers crash with them, sporadically, and with 7950s directly in mobo: stable for hours and hours +).

What  brand risers do you use / trust to put in your rigs?

Are there any you're suspicious of for quality reasons?

Other reasons behind these crashes you can think of?

+1

I will be monitoring this thread.

Disclosure: I recently ordered PCI-e16X->PCI1X w/molex risers from Cablesaurus.

PS: Anyone got any idea how long they take to ship? I ordered a week ago.. :-*

I saw those from Cablesaurus ... not sure with the molex connector is for. But this could explain a lot due to differences in power specifications:

"All sizes of ×4 and ×8 PCI Express cards are allowed a maximum power consumption of 25 W. All ×1 cards are initially 10 W; full-height cards may configure themselves as 'high-power' to reach 25 W, while half-height ×1 cards are fixed at 10 W. All sizes of ×16 cards are initially 25 W; like ×1 cards, half-height cards are limited to this number while full-height cards may increase their power after configuration. They can use up to 75 W (3.3 V/3 A + 12 V/5.5 A), though the specification demands that the higher-power configuration be used for graphics cards only, while cards of other purposes are to remain at 25 W.[10][11] Optional connectors add 75 W (6-pin) and/or 150 W (8-pin) power for up to 525 W total (75 W + 3×150 W)" from http://en.wikipedia.org/wiki/PCI_Express#Power

So by plugging a x16 card into a x1 riser, you're only able to pull 10-25W max from the PCI-E side. A graphics card might be expecting 25-75W, hence the instability.

Good Find!  That may well be the problem if I'm reading that right.  I'm going to mod (https://bitcointalk.org/index.php?topic=76121.0) a spare 16->1x riser to have molex over the next few days (hopefully tomorrow) and will retest the system for stability and report back.

In the mean time... Anyone want to chime in on what manufacturers/vendors you like to use?

I think Cablesaurus is the only molex-modded seller. I'd look into how to make my own but with BTC (and LTC   ;) ) time=difficultie$

Not true! I sell them as well for much cheaper, and based in the US :)

do you ship them to europe as well?

Yep, I ship internationally!

Good to know there is a different option.  I think at least some of Cablesuarus items are on backorder right now...

They are way too expensive and over priced anyway. ;)

I buy chinese 1x > 1x risers and file off the end so it is open ended. 2 bucks each, and easy to plug in/unplug. Won't damage the video cards or motherboard. I find 16x risers need an excessive amount of force to plug in/unplug and the risers easily break because of this.

First a note on my project - making the molex riser is easy as oatmeal.  First time, including watching a video on soldering (it has been quite a while heh forgot to use flux as I don't use it with LEDs), and practicing a few times <20 min.  Welds are solid.  Will take <5 next time :)

But comp still crashes sporadically every ~5 hours.   What a pain I'm pissed at my rigs right now - but thats another topic..



Thanks for the info Cryptocables, you have decent prices for sure!  And domestic shipping is LEGIT.


That Is a trick I surely will have to try...

I use these ones: http://goo.gl/YSDhR

http://i.ebayimg.com/00/s/NzI0WDkyNQ==/$(KGrHqR,!jYE+pswuPpDBP7-huiSNg~~60_1.JPG?set_id=880000500F

I get stable 660 mh/s on my xfx 7970 black edition.

what are you settings for your xfx 7970?

i get the cheap ones off amazon from hong kong, no problems yet