What is the correct replacement a/c adapter for HP EliteBook 8760w?

[Georgia_in_MS]

I have the HP EliteBook 8760w with 2.70 gigahertz Intel Core i7-2620M.  I lost the power cord from the brick to the wall and am trying to buy a new a/c adapter.  The part numbers on the HP website are for 200W and 230W.  However, the brick that came with the laptop (bought on eBay) is PN #534093-001, which is 90W.  Was it sold to me with the wrong voltage adapter?   If you Google HP EliteBook 8760w power adapter, you get probably 50 different part numbers.  I have tried figuring this out on my own, but uncertain what I need to do.  Would someone please tell me the correct part number for the a/c adapter?  And why is a 90W working but everything seems to lean toward 200W or 230W?

[banhien]

@Georgia_in_MS

From tha manual, machine can run with 2  AC Adapters

• 230W RC/V Slim AC Smart Adapter part # 611533-001
• 200W RC/V Slim AC Smart Adapter part # 645154-001

The 90W adapter is too weak for a mobile workstation class machine. Normally it is for for travelling because it is much lighter

Regards.

[Georgia_in_MS]

Thank you. I will order the 230W.  I did not know adapters were interchangeble;  I thought they would ruin your PC if you used the wrong size adapter.