Dell R730 with single E5-2623 3V3 CPU - can I add a second?

Hello

Yes, the R730 supports two CPUs and the E5 2630L V4. You can find documentation for the R730 on the support page.

http://www.dell.com/support/

Thanks

Hi DELL-Daniel My

If i want to upgrade my server PowerEdge R730

What hardware to required?

Intel Xeon E5-2620 V4

Heat sink

Only above item?

Hello, please note that you have to use the same processor for the upgrade.
Also I don't know how many fans you received from the factory when you first purchased the server, but all the fans should be plugged in as well.
Respectfully,

Hi DELL-Young E

same processor with heat sink only? 

for fan will check how many we have

Thanks

Yes the same Intel Xeon E5-2620 V4 and heatsink.

Thanks