I connected four U2715H to by Lenovo PC with NVS510 display card using the mini DP to DP cable (NVS510 had 4 mini DV out). But the monitors sometime works and sometime didn't. It show no signal, enter power saving mode or flashing. All 4 monitor had same issue ramdomly. But sometime all four monitor works well, but after a period of time or restart my PC, the issues happen again.
Do I need to switch to a better display card? Which display card can support four U2715H? I check that the NVS510 should able to support four 2560x1440 resolution monitor. But looks like the monitor didn't able to detect teh signal from the NVS510 display card.
