Long shot but might work. Uninstall nVidia drivers, then open device manager, remove any/all video cards listed and shut down computer. Pull the PCIe card out of the system and then boot into safe mode. Run Driver Sweeper and CCleaner then reboot. Find the latest nVidia driver that supports both cards (note: make sure it supports PCI and not just the card model) and install. Now run BOINC to find out if it can now see the card. If it does then shut down system. Install the other card and boot into safe mode. This is important as safe mode forces Windows to reset all pre-boot cache files and settings. Now reboot normally. 50/50 chance this will work. Windows is a flaky POS so sometimes you have to jump through a bunch of hoops that's in the middle of a gater infested swamp to get it to work like it is supposed to...... Its a pain!
will order one in may for my wifes old computer. think its a 1.2ghz or 1.6 but im sure it has a pci slot. going to max out the ram in that one too.
If I stick 4 of these and a single slot pcie 16 card in one box do I need more ram? I have 2 gb now.