Asrock 970 Extreme4, 4x R9 280X, 4x Powered Risers - page 2.

dminer69

sr. member

Activity: 322

Merit: 250

i had some what the some problem with my first rig evga x58 ftw3, i had to get 16x riser on the 3 pci e and one power 4 pin on my four card and i wouldnt get 100% on my 3rd and 4th card, so i ratter keep my rigs at 3 cards.

you could always get your self some use parts on ebay to run an extra card or 2 , did it my self got my self a dual pci e board for 50 bucks on ebay
and i was able to run 3 cards on it.

nnay_th

newbie

Activity: 36

Merit: 0

Quote from: suzanneg on January 01, 2014, 12:43:29 AM

Hi nnay_th,

Have you been to this site: http://www.cryptobadger.com/2013/04/build-a-litecoin-mining-rig-windows/.
I been looking forward to build the same rig, hope this site can help. Happy new year.

Hi suzanneg,

This is exactly where I got my info about building a rig! Best tutorial I could find so far! Grin

The difference is that I intend to use 4 GPUs with 4 powered PCIe 1x to 16x risers.

Quote from: cryptoprime on January 01, 2014, 01:13:27 AM

You might need pin shorting: https://bitcointalksearch.org/topic/list-of-motherboard-that-require-shorting-pin-a1-b17-for-pci-e-1x-to-work-36061

Hi cryptoprime,

Yes I'm considering doing this, but I can't find info from owners of the same mobo.

Do you know if I can safely short a PCI x16 slot? I found infos about shorting a 1x slot, but nothing about the 16x slots.

Also I read stories from people frying their mobo shortly after shorting their PCIe ports... simply horrifying.. Shocked

Quote from: justkid on January 01, 2014, 04:46:37 AM

What psu are you using?

Hi justkid,

I have two Akasa Cobra 850w running on the same rig, which are intended to power two GPUs each. With a total of 1700w, I think that might not be the issue.

justkid

newbie

Activity: 25

Merit: 0

What psu are you using?

cryptoprime

newbie

Activity: 57

Merit: 0

You might need pin shorting: https://bitcointalksearch.org/topic/list-of-motherboard-that-require-shorting-pin-a1-b17-for-pci-e-1x-to-work-36061

suzanneg

newbie

Activity: 8

Merit: 0

Hi nnay_th,

Have you been to this site: http://www.cryptobadger.com/2013/04/build-a-litecoin-mining-rig-windows/.
I been looking forward to build the same rig, hope this site can help. Happy new year.

nnay_th

newbie

Activity: 36

Merit: 0

Hello everyone!

I started mining WDC a couple of months ago with my gaming PC, then got caught in the game. I bought a mining rig a couple of weeks ago:

Asrock 970 Extreme4
AMD Sempron 145
2x2GB Hynix DDR3
3x Asus R9 280X DCU2 Top
Win 7 64-bit.

It is working great (about 720kh/s each) until I bought a fourth GPU. I decided to get 4 powered risers (PCIe 1x to 16x). When I use those, only one GPU is recognized, on the PCIe5 connector with a lower hashrate (600kh/s). And sometimes the fan of the GPU in the PCIe1 connector do not spin. I tried several connectors, and the only difference I had was a totally black screen.

All the GPUs are working fine if they are connected directly on the PCIe 16x connectors, but there are only three of those and heat is an issue.

Did anyone had this issue before?

Also, I don't know if it is relevant, but the powered risers have only a +12V molex connector, without Ground.

Thank you and Happy New Year!!! Wink

Topic: Asrock 970 Extreme4, 4x R9 280X, 4x Powered Risers - page 2. (Read 6028 times)