quick memory speed question

[Braka]

what kinda speed differnce would i see going to a 7-7-7-20 from a 5-5-5-15

would it be noticeable? (i know it will be slower? i think)

talking about ddr2

edit: from 2x1gb ddr2 dominators to TWIN2X4096-8500C7 PC2-8500 4GB Kit 7-7-7-20

do u think its worth it or should i keep looking till i find the same timings? 5 5 5 15 ?

 

[Braka]

its a 2x2gb kit as far as i know

the guy linked me towards this
Corsair site

and said it was model TWIN2X4096-8500C7

mabe im confusing things i hope not

 

[Braka]

it would be 2nd hand from mm asking 55 im hoping to slip a 45 offer in

ye iv been told elseware also about the kington incase i cant claim warrenty on the 2nd hand ram , but in this day and age saving a few pound when possible might be the better option even tho i would normally prefer to buy new