it's actually not bad at all...the key of OCing is a sufficient Cooling System...Seriously, your chip age won't really be shortened by doing OC, but it's how you cool it that matters...As long as you cool it sufficiently, no matter how high you OC a chip, it won't really be dead in, perhaps, couple of months or so...so it's actually okay and say, if a chip were supposed to last like for 10yrs, i wouldn't really mind shorthening it to 5yrs by doing OC

I have no plan of keeping it for 5yrs anyway...hehehhe...still, i don't recommend everybody to OC like hell, OK?! (I just don't want anybody saying ****ty things if i say "I have no plan of keeping it for 5yrs anyway"

)
Mosfet cooling is quite needed if you OC with a pretty high voltage...but i don't really know how high is too high for your CPU in particular (Intel in general

)...i'd suggest you to try to give some cooling and see if it does bring more room for your OC...but like you said, it wasn't that hot...so could be unnecessary
btw, seems like that A-DATA uses TCCD chips...which aren't that good to be paired with Intel...it's such a shame to have such nice mem which are actually rated to run @250MHz running @ 'only' 229MHz (some people do consider that pretty good though

..it's quite relative anyway)...AFAIK, people OC Intel procs by changing the multi...but maybe it's not applicable to your chip...man i don't know too much bout Intel chips...i've always been playing with AMD Procs so far...XP-Mobile, Winnie 3000+, 3200+ and now Clawhammer 3500+...oh well...sorry...