1 x 1gb + 2x 512mb

Cannot answer on an AMD setup.
On an Intel system you would need to use pairs of modules - so either 2 or 4.
 
I think I may have told a little "Porkie Pie" with regards a single memory module.
You'll of course have no dual-channel capability, however I believe that these days you can indeed install just a single module.
In fact I know I lied on the single module situation :)

I've just flicked through my last two motherboard manuals (I965 & I955 chipsets) and neither of them mention any 3 DIMM configurations.
Sorry - hopefully somebody else will pick up on this thread and confirm deny.
I think I'm thinking back to an older chipset.
 
Going back to the old Nforce 2 days, you could run 1 x 1GB and 2 x 512MB as long as each channel had the same amount of memory on it.

It should work the same for newer chipsets as well, Maybe the on chip memory controller doesn't allow it though.
 
My mobo manual just states each channel must have the same amount in each channel to work dual-channel, so I'd have to say yes.....

1*1GB in channel one, and your 2*512 into channel 2.......
 
Sorry for being thick here! :)

But, are we saying, for example, that you could have a 1GB stick in Slot 1, and 2 x 512MB sticks in Slot 3 & 4, and that will still work in 'Dual Channel' mode?

I was looking to upgrade my 2 x 512MB with another Gig, and didn't want to bin my current ram to do so.

Edit: Sorry for barging in here, but I think we're asking the same thing, and I don't mind being the idiot who needs it spelling out! ;)
 
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it will work depending on your chipset
i have atm 1.5 gig (1 x 1 gig 1x512mb) in DUAL channel mode and i renember when i used 1248 in cha 1 and 256 mb in cha 2 it still was dual channel according to bios post screen, cpu-z and everest, if you have a intel based system with a 945 series chipset or higher u can place them in any order and still have dual channel mode.

Can show u a pic of mine:
 
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