1100 .. but i think was a problem from the mobo or something else... bc this problem happen only when i use the pcie1 .. if i use others pcie it start (but with more than 1 gpu the gpuS aren't detected...)
Note that you !MUST! use powered risers with this mobo since there is no separate connector on the mobo for the pci-e slots. Even though the cards are powered by an onboard power connector they still draw some power from the motherboard.
In addition, there may be some bios settings on this mobo regarding the detection of GPU's
Order of troubleshooting as follows:
1. GPU's - Test each one with the pci-e x16 slot one at a time and see if each one mines.
2. Risers next - Test each one at a time to see if the GPU mines...I have seen this test fail. Also make sure the single wire on the Molex connector is not popping out when you plug it in....triple check this.
3. Now start adding one card at a time rebooting and checking to see if the newly added GPU mines.
If a newly added GPU stops mining then go to this forum for more help
https://bitcointalksearch.org/topic/list-of-motherboard-that-require-shorting-pin-a1-b17-for-pci-e-1x-to-work-36061A good rule of thumb for PSU's is 300W for any cpu or gpu in your system as follows:
-mobo and 1 GPU = 600W
-mobo and 2 GPU = 900W
-mobo and 3 GPU = 1200W etc
This assumes you are using at least 80 plus high end name brand power supplies...personally I like to use Gold. Stay completely away from none name brand PSU's