Mixing MHz and timings on Dual-channel?

[peps1]

Hey guys, iv got 2x 2 GB DDR2-800 (6-6-6-18 @ 400 MHz) in my MOBO right now, and Id like to add another couple.

My MOBO data sheet says

4 x DIMM, 8 GB, DDR 800/667/533 ECC,Non-ECC,Un-buffered Memory

So is that 8GB in total or per DIMM?

and being Dual-channel would it still slow all the RAM down to the lowest speed? or say run 2 at 6-6-6-18 @ 400 MHz, and 2 at 5-5-5-18 @ 800 MHz?

 

[andy_mk3]

That's 4 slots, 8GB in total, so 4x2GB maximum. Whatever RAM you put in, it wall all run at the speed of the slowest stick.

 

[peps1]

Thanks Andy, and with DDR2 do you double the Frequency = where my Ram reads 400 MHz then its actually running at 800 MHz?

 

[Space Monkey]

Thanks Andy, and with DDR2 do you double the Frequency = where my Ram reads 400 MHz then its actually running at 800 MHz?

Yep, DDR= Double Data Rate