no problem but their are other things to consider besides those things.
Latency,Timings, ddr or sdram. many things
About latency=CAS Latency is the ratio of the memory's column access time divided by the current system clock. The column access time turns out to be a constant value, so you can see as you in increase the system clock it becomes harder to achieve a lower CAS latency (denominator grows-- numerator stays the same--
From this and the example up above you can conclude that the lower the CAS delay or latency, the better.
And timings well those arn't to important but you need to know if your mobo can support ddr or sdram. they are diverent sizes so make sure you get the right one. And if you get ddr ram make sure you get 2 sticks of 512mb to utolize the dual data interface integrigated on the ram