Insprion 1720 memory upgrade issue

[lehighace06]

So i bought the below linked memory kit, after doing research that showed it would be compatible with my laptop, DDR-2, 800MHz and total of 4gb (2x2GB) all should be within the limits of the laptop. The original memory is DDR-2 667MHz and 2GB (2x1GB), and I do not have any way to test if one of the dimms is DOA or if there's a compatibility issue. Is there any reason the 800MHz memory is not working? I obviously need to send back what I've bought, but should I do a return and purchase 667MHz memory, or should I do an exchange for the same item? Thanks for your help.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231156

 

[Rosebud]

Think you need to clear RTC RAM,sorry dont know how to do that on a laptop

 

[lehighace06]

RTC RAM? whats that?

 

[Rosebud]

resets ram

 

[Rosebud]

or clears it