This message was posted on behalf of Intel Corporation
When it comes to wireless adapters, there are many form factors available (connector type + adapter size).
In this case, it's likely that the new board you purchased was intended to be used with a different wireless adapter type, hence the mismatching wireless antennas. This won't necessarily limit you to 802.11n, it will only limit which adapter model and brands will work for your laptop.
Our recommendation will be to contact your computer manufacturer (Lenovo*), as they are the only ones who can tell you which wireless adapters are approved for your replacement motherboard. We don't keep this sort of information on file, as it's possible that it may not be an Intel® adapter. We also recommend purchasing the adapter and the antennas from your computer manufacturer, if at all possible.
- Computer Manufacturer Support Websites.
As an additional resource, you may like to review the following articles:
- Regulatory Information Regarding Wireless Hardware Installation or Upgrade.
- Why Doesn't My Laptop Recognize My New Intel® Wireless Adapter?
We hope this information helps. If you require further assistance, please let us know.