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Who can help me with this AMR

Hey guys, newbie here, please who can help me with AMR choosing.

AMRRQ3-315(www.kynix.com/.../AMRRQ3-315.html)
and
AMRRQ3-433(www.kynix.com/.../AMRRQ3-433.html)

which would be better for me to probe into? thanks a lot.
i noticed that the Hz is a big problem and does that really matter? is there any boundaries of this?