Re: Can I add DDR2 memory stick?

You have more memory, but in some machines this will kill the dual-channel memory mode, cutting the effective speed of the memory system in half.

What's more important, memory size or memory speed? It depends. But I'd guess that for most users, 512 megs in dual channel mode will be faster then 768 megs in single channel mode.

Note1: Not all systems support dual channel mode, no matter what you do. In a system that only has single channel memory anyway, obviously you go for more memory, since mixing a 256 and a 512 meg module doesn't slow anything down.

Note2: There certainly are situations in which 768 megs of single channel memory will outperform 512 of dual channel memory. This is user and application software dependent.


Roy wrote:

Yep, the "key" in the socket is in a different location.  You cannot
plug the wrong one in.  Well, unless you use a big hammer.  :-)



DDR and DDR2 are not "single and dual channel" memory.  They are totally
different types of memory ...  as different as SDRAM and DDR.  Not only
can you not mix them, but as far as I know, a machine made for one
(either one) won't take the other, at all, period.



What ever you people are thinking....I don't know if you really applied
those ideas of yours but I understand DDR and DDR2  are incompatible.
But ..I really   replaced one of the 256 MB with one 512Mb making the
total memory to to768 MB and my applications where larger memoryworks
better...

.

Relevant Pages

  • Re: Memory question
    ... motherboard supports dual channel memory, ... A single channel Nforce2 motherboard, versus a dual channel ... is the Nforce2 chipset is ...
    (alt.comp.periphs.mainboard.asus)
  • Re: DDR2 vs. Dual Channel DDR2
    ... Maybe what I should do is order some Dual Channel memory and see what ... I'll need to decide if I should try Dual Channel ... GX620's with 1GB ram on each. ... would it be true that if I install Dual Channel RAM and insure they ...
    (microsoft.public.windowsxp.hardware)
  • Re: Help! I already ordered the RAM Was it right?
    ... I've not heard of any x4 chips being used on 512MB DIMMs. ... The best memory config for a S939 board, ... When operating in this mode the DRAM interface never operates ... 1GB module and run 2x1GB in dual channel mode. ...
    (alt.comp.hardware.pc-homebuilt)
  • Re: Memory RAM Upgrade
    ... a four stick configuration usually ends ... overclock speeds on the memory bus. ... There is a difference between single channel and dual channel ... high density RAM is a mistake. ...
    (microsoft.public.windowsxp.hardware)
  • Re: Dual Memory Architecture...worth it in a business environment?
    ... memory speeds but also if we want to upgrade again, ... Is the dual memory architecture worth it ... dual channel memory configuration. ... system, I could tell the machine had single channel, just from ...
    (alt.comp.hardware.pc-homebuilt)