If you have an intel chip, you have to go into your bios of your motherboard (if it allows: can't on OEM computers like gateways or dells, only on premium boards like Abit, Asus, Gigibyte, MSI, DFI etc.) and raise your front side bus. For instance I have a P4 2.6 CPU with the 800Mhz bus. That means my CPUs internal speed is 200Mhz and is what intel refers to as quad pumped to end up at an 800Mhz front side bus. The CPU's multiplier is x13 so 13 times 200Mhz gives me my final speed of 2.6 Ghz. I have my front side bus set at 250, so that means my memory bus is 1Gbz and my system is now 13 times 250 so 3.25 Ghz.
My friend has a 2.8 chip so he doesn't have to raise his fsb as high to hit the same speed, but raising your speed gives you more memory bandwith, so for instance when I compare my system to a 3.2 or 3.4 pentium running stock at the 800Mhz bus, my system achieves higher scores in the benchmarks.
Now the bad news. You need to have the same type of memory to overclock in dual channel mode. That is why if you look at memory manufacturers they sell dual channel kits, these are matched dimms so that they work together well and can overclock. If you are not in dual channel mode, (two sticks of matched memory on a motherboard that supports dual channel) then you are running at half the bandwith, and are slower than a system running Rambus memory. So long story short, no matter how lucky you get with your overclock, your system would be a lot faster with dual channel memory at stock speeds.
Originally Posted by Korke
Hello, i got one stick , the other one of this i gave to my mother http://www.komplett.se/k/ki.asp?sku=304466&cks=PRL
and i got a 512 PC3200 which works and everything but cpu-z says it's a PC3500 and in that little bar below it says, PC3500
CL 2.5, 217
Conclusion: i got a 256 Kingston value ram, and a 512 Twinmos Speed Premium, as seen on the link above.. How do i overclock??
I will post some pictures from cpu-z so you can easily tell me why it says PC3500 and 217, i haven't overclocked them yet, how do i overclock mem?