# Installing fast RAM on very old computer

**URL:** <https://forum.kirupa.com/t/installing-fast-ram-on-very-old-computer/282462>\
**Category:** random\
**Created:** [February 22, 2009, 5:13pm UTC](https://forum.kirupa.com/t/installing-fast-ram-on-very-old-computer/282462 "2009-02-22T17:13:12Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![NeoDreamer](https://avatars.discourse-cdn.com/v4/letter/n/ccd318/32.png) [@NeoDreamer](https://forum.kirupa.com/u/NeoDreamer)\
**Post date:** [February 22, 2009, 5:13pm UTC](https://forum.kirupa.com/t/installing-fast-ram-on-very-old-computer/282462/1 "2009-02-22T17:13:12Z")

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My 4 year old Dell Dimension manual only suggest that I install DDR2 400 or 533 RAM. I have some DDR2 800 lying around. If I put these into the PC, will it underclock properly or will something bad happen like the mobo frying or the RAM getting damaged?