1.8v vs. 2.2v


Jan 22, 2008
I have purchased a P35-DS4 and the specs say the memory supported is 1.8v but I purchased 4gb (2 sets of dual 1gb sticks) Kingston Memory that is stated as being 2.2v.

Is this going to be a problem?

Also, I do not understand memody latency. Is 5-5-5-15 better than 4-4-4-12? I suspect not but have not been able to find a definitive answer anywhere else.

BTW, I plan on using a Q6600 cpu.


Feb 21, 2006
No, it should not be a problem.

"Officially" 1.8v is the standard and therefore anything outside of that may not be supported.

However, most boards will let you increase the RAM voltage to higher numbers. This is done to get the RAM to run at faster speeds.

In general, the default values for the RAM will be less than what they say on the packaging. They may say "DDR2-800" but when you plug it in it is only at DDR2-667 until you manually adjust it in the BIOS.

This is because the RAM will not work at the DDR2-800 speeds @ 1.8V, which is the default. Once you increase the voltage, you can increase the speeds and all will be hunky-dory.

In regards to timings, 4-4-4-12 is better than 5-5-5-15, but you will not be able to ever notice the difference. It's too small to be humanly perceptible, so don't fret about it.