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290x stability

W

wand3r3r

Limp Gawd
Joined
Dec 17, 2011
Messages
422
I had a stable setup but switched things around. Here's the end result. I dropped my other card(s) out of this setup.

MSI Z87-G45 Gaming
Reference 290x x2 (Hynix & Elpida)
7950 DCUII

The hynix card has not been stable lately, I actually suspect the 16x riser is the issue because it's been unstable since I added it (it just dawned on me while writing this).

Has anyone had issues with 16x risers? It's stable at 900 core but when I bump it to stock it crashes. Each crash is accompanied by a jump in voltage to 1.15v (normally ~1.09v while mining). I don't know if the voltage jumps before or after the crash though since the screen freezes for a while.

Compulsory nerd art
x7iAHK2.png
 
I did. I ended up not using it. I'm using identical cards like you. 290x reference.

I could not for the life of me get it to run stable with the 16x riser. Now I just use 1x-16x risers with the ASRock BTC board. I hook up the additional molex in order to ensure stability of the board.

Since then, due to sheer noise, I got 3x Sapphire 290x's Tri-X and I've been quite happy.

The reference cards now mine in my watercooled system. Quiet + Mining = WIN.
 
I had a problem with a 16x-16x and changed it to 1x-16x riser with powered molex and fixed the problem on my 7950s.
 
Argh, it sucks to drop the riser, it helps keep temps in check a little more.

I'm really tempted to go aftermarket. I only wish I had known I would consider an open bench.
 
Having seen plenty of hard locks, I've fixed most by changing the PSU arrangement. In your arrangement, try switching the 7950 riser to the PSU2 (the one powering the PCIe) and cut the 12v+ lines that the riser has going into the mobo (on the ribbon cable). Google the PCIe pinout for which ones those are.

You're crossing 12v streams. If you power off PSU1 without powering off PSU2, it will likely feed back into PSU1 (you'll see the fan spin).

Two of my rigs exhibited hard locks and sick cards after a few hours. Fixing these issues made them 24/7 stable.
 
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free bump -- im building my first 2 PSU system now... and i swear for the life of me I can't get 5 or 6 cards active (powered usb risers all off the primary PSU) all (R9 270's)


right now I can't even get the machine to POST with 5 cards let alone 6.


mobo is gigabyte 990fx

Ive take special care to put all the molex power risers on the

sorry - not intending to thread jack -- 2PSU systems are new and pissing me off, im also sleepy and have surgery tomorrow (yay getting hernia fixed)
 
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