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I am looking to buy a ASUS M4A79 Deluxe motherboard at NewEgg and under the specs there is a note regarding the memory standard for this MB. It says:

Memory Standard:

  • DDR2 1300(O.C.)/1200(O.C.)/1066 * /800/667
  • ECC,Non-ECC,Un-buffered Memory
  • Due to AMD CPU limitation, DDR2 1066 is supported by AM2+ / AM3 CPU for one DIMM per channel only.

What does the limitation emphasized above means in layman's terms? The MB supports 16 GB of memory and it seems like the only way to max it out is by using DDR2 800 4G modules X 4. Is that a correct assumption? The main use for the system I'm building is as a development workstation that will run several VMs.

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up vote 1 down vote accepted

What it is saying that DDR2 800 and 667 is supported for all 4 DIMM slots. If you use DDR 1066, AMD specifies that DDR2 1066 is specified to work with only 1 DIMM per Channel (2 DIMM slots). If you add more memory or faster memory, then you are going outside the processor manufacturer's specifications (I believe O.C. here stands for "Over Clocking").

There is mention just under the memory support statement "Refer to for the memory QVL (Qualified Vendors Lists)." This means that Asus has tested specific DIMM modules and have found that they work with this specific motherboard. (Unfortunately, I can't find the QVL for this motherboard on ASUS' website.) The QVL gives information about which DIMM model they used and in which DIMM slots they passed. If a DIMM module is on the AVL as passing and it is greater than 1066 or 1066 with 4 DIMMs populated, then this means ASUS tested it and it works.

So, your assumed limitation is correct if you select memory not on the QVL.

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That is a correct assumption. Using an AM2+/AM3 cpu would limit you to two slots if you were using 1066 DDR2. You are correct in how to maximize that mb's ram with 4 - 4gb DDR2 800 sticks.

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So u would need 4 of these. As Troggy said, you are correct.

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