Thanks again for your help. :)

Hum indeed, 3000Mhz was maybe too much. :(

wardog wrote: Here: http://www.gskill.com/en/configurator?manu=52&chip=2276&model=2297 Shameless plug for the only memory brand I use. G.Skill has tested each kit listed in the above link and Guarantees compatibility.

Thanks for the reference, I may go with G.Skill if the issue is confirmed.

Unfortunately I have no other stick to test that, only old DDR3 sticks from my old PC. :(

You are totally right: I've plugged the beeper but no sound. :(

parsec wrote: This is your memory, correct: http://www.corsair.com/en-us/vengeance-lpx-16gb-4x4gb-ddr4-dram-3000mhz-c15-memory-kit-black-cmk16gx4m4b3000c15 Your memory model number is only one letter different than other Corsair models in your board's Memory Support list. For example, there is the CMK16GX4M4A2800C16 model, a Vengeance LPX model, of slightly different speed and latency. I wonder if that letter is a color code? Your memory seems as if it should be OK.

Exactly this one.

If not compatible that would be quite subtle.

parsec wrote: The PSU is a bit on the low power side for an X99 platform, but if you don't OC the CPU, and don't have a lot of other hardware, it may be usable. Is this the PSU model: http://www.bequiet.com/en/powersupply/518

Yes this one.

As of now I won't OC and I won't play games.

parsec wrote: If that is the PSU you have, I'm concerned about an aspect of its design. This PSU multiple rail design, with three 12V rails, rated at a maximum of 18A each.  The DC wattage of 18A at 12V is, 18A x 12V = 216W. The maximum combined 12V power in Watts is 384W. Note that this does not include the power draw from the 5V and 3.3V rails. Three 12V rails at 18A each would be 216W x 3 = 648W. Obviously beyond the 400W continuous and 450W peak power ratings. Again, this calculation ignores the power usage of the 5V and 3.3V rails. Using the maximum combined 12V power of 384W, that would be 128W for each 12V rail, ignoring the 3.3V and 5V rails. I cannot see the three 12V rails power distribution for all the cables, usually given on the label on the PSU. My point is multi-rail PSUs need to have their power draw balanced to prevent overload on each rail. Your usage of the PSU is not complicated, and given your hardware, it looks like you'll be Ok.

Only two rails are used: the ATX 24 pins and the CPU one.

And the GPU is directly powered by the PCIe.

So indeed should be OK, especially at boot time.

[QUOTE=parsec]Try using one DIMM only in the A1 slot. Try another PCIe slot for the video card. The connection to the video card makes no difference, just be sure your monitor will either auto select that input, or switch manually to HDMI, D-Sub, or whatever is in use.[/QUOTE]