4GB DDR3 SODIMM for Elitebook 8540w PN AT913AA or PN AT913UT?

the internet says the two 4GB DDR3 SODIMMs are compatible with my 8540w... which should I get?  There's a significant price difference but I can't tell why... thanks!


Both the modules have the same specs, you can choose AT913UT which costs less.
Although I am an HP Employee, I am speaking for myself and not for HP.
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