The latest computers are likely to have a mixture of PCI and PCI Express slots, which means you may not be able to install all the PCI data acquisition cards that you used in your last system.
ADLINK have produced a range of PCI Express data acquisition cards that are direct replacements for the high performance analog output DAQ-2500 series. Install a DAQe-2501 PCI Express analog output card, instead of a DAQ-2501 (PCI version) and no changes to software are needed.