Originally Posted by Fishie36
Getting faster memory than your board supports is fine if you are overclocking, since it will allow you to get back up to the rated speed of the memory. Other than that, sometimes faster memory is cheaper so it's fine to get it.
I don't really know much about overclocking FSB speed, but hey, this is overclock.net; I will probably search around once I find more time for myself.
I just did a little more research and I found out that the general DDR2-533 CL 4 RAM and DDR2-667 CL5 RAM are actually performance-wise virtually equal practically.
Although increasing clockspeed from 533 to 667 increased its theoratical bandwidth by 25%, the higher CL actually decreased its performance by 20% (4/5 = 0.8), though is kinda strange to me why CL is exactly, inversely proportional to RAM performance. But anyway, 1x * 1.25 * 0.8 gives you 1x again.
And somewhere along the thread (#27) in the first link below, one guy mentions that DDR2-533 CL3 is faster than DDR2-667 CL4, which I think according to calculations below, is true.
DDR2-533 CL3 : DDR2-667 CL4
1 : 1 * 1.25 * 3/4
1 : 0.94
I hope this info is useful to those who are having similar doubts regarding 533 and 667.
And once again, thanks for the replies so far. =)
Argh, just one more question popping out here:
"Faster DDR2 DIMMs though are compatible with slower DDR2 DIMMs. The memory would just run at the slower speed. Slower DDR2 memory are not compatible with faster memory (i.e. you can put a PC2-6400 module in a PC2-4200 compatible system, but you cannot put a PC2-4200 module in a PC2-6400 system)."
- Wikipedia (http://en.wikipedia.org/wiki/DDR2
Is the last part about "you cannot put a PC2-4200 module in a PC2-6400 system" true?