frighten98 wrote:That only means that you can't install two CPU on a Z420.
Also means that the 2665 support 2 CPU, not that you can't install it on a single socket motherboard like the one on the Z420.
Well when I seen the sheet its also mentioned the PSU is 600 watt But UAE with z420 only 400 watt PSU come, may be vary country to country. I'm bit confuse, but if HP document saying that motherboard will support then you can buy it but still the block date will be problem, just go to the this thread.