I have 6 of these brand new, unopened. PM me if interested.

These motherboards are great for mining because they will fit 4 double-wide GPUs.  I have 5 of these brand new, unused, unopened.

I ran 4 R9 290 cards on this model motherboard and had no issues.

I can accept PayPal or BTC or Cash in person (I'm in northern NJ).

I'm taking offers. PM me if interested.

I have 8 brand new Radeon R9 290X cards for sale. These are unopened, still shrink-wrapped.

Model VisionTek 900654 (reference cards)

Will sell any quantity, but prefer to sell all 8 at once.

I can accept PayPal or BTC or Cash in person (I'm in northern NJ).

I'm taking offers. Best offer gets them.  PM me if interested.

Could anyone tell me what the BTU rating of a server with 4 R9 290X cards would be?   I am able to meter the electricity used, currently 1.4Kw, but I don't know how to measure the heat output.

Has anyone tried different cards manufacturers? I'm wondering if they are all about the same. I've got two rigs, one with Sapphire R9 290 cards and the other with ASUS R9 290 cards.  The Sapphire cards are averaging about 890kh/s and the ASUS are averaging 875kh/s.   There are many other brands: HIS, PowerColor, MSI, XFX, Gigabyte, Diamond.  I'm thinking of going with HIS cards in my next rig, but I'm not familiar with that brand.

I built two rigs so far. Each with 4x R9 290 cards in them.  They run great. I am able to get 3.5MHs from each.  The only problem is that neither system will boot without a monitor attached. I think this may be a BIOS/Motherboard issue. In one rig I have an asrock z87 extreme9 motherboard and in the other I have an asus maximus vi extreme motherboard.  Can someone recommend a motherboard I could use so that my rigs can boot without a monitor attached?  (Dummy plugs won't work on 290 GPUs).

Hi All!

I just set up my first rig using four R9 290 (ASUS Brand).  I'm getting 3.5MH/s average doing scrypt mining. All is good. However my rig will not boot with out a monitor attached. The hard drive doesn't even start blinking so I don't believe it gets past POST.  If I plug in a monitor then it starts without issue. I'd really like to go headless though.  My MB is ASRock Z87 Extreme9/ac.  I tried upgrading the bios, no luck. The only setting I found in the bios was "primary video" the choices are onboard/PCIe.  If I select onboard, then windows doesn't find the GPUs. If I select PCIe than it doesn't post without a display attached.  Dummy plugs won't work because the R9 doesn't have RGB out. I probably need a different MB. Any other suggestions?