What is the difference between 800 mhz and 667 mhz

[MIKO30]

i have a something that confusing me,,when i have only 1 memory stick that installed on my mobo and when im booting in and go to bios it said that i have 800 mhz unchanged mode,then now that i installed another 2gb 667 mhz it only said on the bios that i have 667 mhz.,,is that normal when i put a higher gig of ram on my cpu??
why it isnt add each 800 and 667 to make it 1467 mhz?? is that normal?

i have a 3 gb now,,but im so confuse of that instead of adding each other but it goes down,,

 

[o1die]

Mixed ram always runs at the slower speed of the two. It's ok on some boards if you don't get any windows bluescreens.

 

[chesteracorgi]

And, some mobos will not even attempt to adjust the faster RAM to allow it to work.

 

[MIKO30]

i have the ecs 6100 mobo sir..,

 

[GI_JONES]

You are confusing the SPEED of the RAM..(800Mhz)..with the ammount of RAM (GB). If you have 2gb, and add 1gb, you then have 3gb. If your 2gb of RAM running at 800Mhz, and add 1gb of RAM running at 800Mhz, you then have 3Gb of RAM running at a speed of 800Mhz. In your case you added RAM with a speed of 667Mhz..which causes all of the RAM to run at 667Mhz, but your ammount of RAM still went up, it is the speed it operates at that went down

 

[MIKO30]

ohh yes thats what im asking for.., well i have 2 gb 667 mhz and 1 gb 800 mhz..but when i put that 2 gb it went down to 667...but its normal my memory is running smoothly...tnx for the info sir...