A:AnswerYes, it should work for that prebuilt. sorry for the late response but I just so happen to also be in need of an upgrade myself with the same system.
A:AnswerHi Patti,
Seems like you'd be fine using this kit with that system: https://support.apple.com/kb/SP758?locale=en_US
If you have anything else we can help with, please reach out: support.corsair.com
-Art
A:AnswerHi EJ,
Seems there are more specifics with this, please confirm which 310S desktop you actually have, and refer to its manual.
If you have anything else we can help with, please reach out: support.corsair.com
-Art
A:AnswerThe answer provided above is somewhat wrong. Your omen will only work with 2400 if you have "Pavilion Power chassis only".
Your Omen supports no more than 2133 so stay away from 2400. Specifically your model supports PC4-17000 (DDR4-2133).
https://support.hp.com/us-en/product/omen-by-hp-870-200/13687063/document/c05355651
