A significant constraint pertains to physical space; motherboards generally possess a restricted quantity of PCI slots, which may limit the quantity of expansion cards that can be installed concurrently. This can be a major problem for users who want ielts slotsto add more components to laptops or small systems where space is limited. Further reducing the number of expansion options available is the possibility that some high-performance cards will take up multiple slots because of their size or cooling needs. Compatibility problems with older software or hardware configurations are another drawback. Even though more recent PCIe standards are made to work with older versions, this does not always mean that hardware generations will perform at their best.
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