On the basis that your current card is an old Fermi based 5000,which was 6 pin, 152 Watt card. NV-DS-QUADRO-5000-Jul10-LR-final.pdf (nvidia.com) Then your 1650 should not offer any complications as it is a very low power draw at 75w. The spec says your card will  draw all the power it needs through the PCIe slot anyway and not even need to be connected to the power supply unit. GeForce GTX 16 Series Graphics Cards | NVIDIA .Just be aware that it's a fairly low spec card so you won't be running games at 1440 or max/ultra settings. Once you physically install it, then your res might drop down until you install the correct drivers from nvidia's website.        
Hey guys, i just got a secondhand Dell T5600 workstation with one Intel Xeon e5-2609 and the 635W PSU, and im going to upgrade the standard Quadro 5000 to a GALAX  Geforce Gtx 1650 (1-click oc), but before that i want to ask you guys about the compability, is it compatible? Are there any stuff that i have to know before upgrading the GPU? 
Do gtx 1650 compatible with Dell T5600?