i have old workstation dell precision 690 & want to try mining with it ; but i found herehttps://www.dell.com/downloads/global/products/precn/en/spec_precn_690_en.pdf
only 512 MB memory available for each PCI Express ( is that a bottleneck for any new GPU ) ;
only 150 watt available ( is that a bottleneck for any new 8 pin or 2x 6pin GPU )
PS: power supply is 750 watt .
am i missing something or that is true ?