Here's my machine : It's a P4 3.2 (Socket 775), memory of 1024 (2 512 (3200) in dual channel), a Chaintech 6600GT, WD SATA Hard drive (200Go) and a mobo V915P. I've already overclocked my cpu (from (200fsb x 16) to (220fsb x 16) (from 3200 to 3520)) and I had no problems (I also raised the cpu voltage from 1,3875 to 1,4 to make sure it stays stable; I passed a couple of benchmarks and cpu stress tests and got no crashes or errors. (Idle temp is around 54 celcius after ocing it which is quite good for a presscott using stock fan (which is a decsent fan). Now I would like to oc my memory a bit as well ; it's 2 512DDR400 (pc3200) stick in dual channel (mushkins). Since they're still running at stock speed, I assume they're running at 200MHz so, from what I've learned reading forums, I should raise them to 220MHz (just like my cpu fsb) to get a 1:1 ratio. But the problem is that I really don't know how to raise my memory frequency. I tried to lower the CAS latency time from 2.5 to 2 but the computer wouldn't boot! (I was freaking out at that point :p) So I went back to the bios, put it back to 2.5 and came here to get some infos bout how to oc memory properly! Everest (a program that lists all your computer hardware caracteristics and stuff) says my memory is running at 2.5-3-3-8 @ 200MHz... dunno if that'll help.

CPUZ is a better program for checking your CPU & RAM settings:

http://www.cpuid.com/cpuz.php

Lowering your CAS from 2.5 to 2.0 can cause instability, as you already found out. To be able to overclock, you may find it's necessary to go the opposite way & change to 3.0. That's not overclocking the RAM though, it has to due with memory timing.

Read your motherboard manual and/or look thru your BIOS settings. The options vary from board to board - it may be CPU:DRAM ratio, in which case, you'll wanna set it at 1:1. It could be a percentage, in which case you'll wanna set it to 100%. There may be a setting that is currently on AUTO...it may have to be changed to MANUAL or USER DEFINED before the other options can be used.

Asus A7N8X-X
1800+ @ 8 x 210MHz
512MB PC3200
Asus Ti4200 128MB
WinME/WinXP Pro

I can't change my memory frequency just like that... looks like it's more complicated... I put the DRAM Timing Selectable to manual (default is by SPD) which gave me acces to CAS Latency Time, DRAM RAS# to CAS# Delay, DRAM RAS# Precharge and Prechage Delay sections but I found no scetion talking about a 1:1 ratio.... Is that by changing those sections value that I'll raise my memory frequency? There is a System Memory Frequency section but the only available options are Auto (default), 333MHz and 400MHz... why would I want to put it to 333MHz or 400Mhz?? That's way to high! I don't wanna fry my memory! I just want it running at 220MHz like my cpu FSB!
I'm so confuse about all this! Please help!

Actually, PC3200 runs at 200MHZ (200MHZ X 2)
400MHZ is the system memory frequency you would use for 200MHZ DDR Ram. 333MHZ is the system memory frequency for 166MHZ DDR Ram. If your FSB is running at 220MHZ, it should be 880MHZ effective speed, since Intel Quad pumps the FSB. You should try to set your memory at a 1:1 if you can, but as Jam said you want to set
your CAS to 3.0...since a higher setting is usually needed for stable (high) overclocks.

If your system fails to boot to Windows, fails to boot at all or is crashing (may included error messages in utilities test), you may want to lower your FSB, since you want to run at 1:1.

Sempron 2400+ OCed to 2.2GHZ
Abit NF7-S2
1 GB PC3200 Ram
Thermal T2-M4 HSF
rmackie@microtailors.com
www.microtailors.com

AIGHT! I just downloaded CPU-Z and it says that my memory runs at 220MHz as well (as my cpu FSB) with a 1:1 ratio! So no need to worry about that anymore! What's weird is that Everest tells me it's at 200MHz...
Do you think I should push my FSB a bit more or is 200MHz to 220MHz al ready a lot? (I don't wanna fry my cpu or something else....)

You won't fry anything by raising the FSB...the system will simply become unstable if you go too high with it, or it may not boot at all. If that happens, you'll have to reset the BIOS (Clear CMOS) & start from scratch.

Keep the memory timing at "BY SPD"

Asus A7N8X-X
1800+ @ 8 x 210MHz
512MB PC3200
Asus Ti4200 128MB
WinME/WinXP Pro

GG- How did you get it to 3.5? Did you use the program I suggested or did you try a different one? Glad to hear it's all working out.

ASUS P5GD1
P-4 3.4 SOCKET 775
1G Corsaire PC400
ABIT RX600SE 256MB PCI-E