I'd guess it's 2.2 ns RAM... rated to about 455 mhz.
Could be 2.8 ns or 3.2 ns though, from the number. What kind of videocard is it on?
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<b>Radeon <font color=red>9700 PRO</b></font color=red> <i>(o/c 332/345)</i>
<b>AthlonXP <font color=red>3200+</b></font color=red> <i>(Barton 2500+ o/c 400 FSB)</i>
<b>3dMark03: <font color=red>5,354</b>