Dell Precision T3600 PSU options

The last time I was upgrading my Precision T3600 I was told that my power supply unit couldn't really handle a new upgade. So I started searching for PSU options but the best was 635W which I currently have. Is there a better PSU for T3600 than 635W.

This might be useful or useless I have no idea.

CPU: Intel Xeon E5-1603 0                       130 W
GPU: Nvidia GTX 1660                             120 W
SSD: SSDPR-CX400-512                          ? W
RAM: Toshiba-0098 KHX1600C10D3/8G  ? W
Toshiba-0098 KHX1600C10D3/8G            ? W
Hynix-00AD HMT325U6CFR8C-PB/2G    ? W
Hynix-00AD HMT325U6CFR8C-PB/2G     ? W

Pyry