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[Zcythe]

I was wondering on a motherboard if a memory standard is like DDR2 800 does that mean it can take DDR2 800 only or can it take some things below it too? Like could it take DDR2 667?

[AhMunRa]

Usually yes.

[Haswell]

Memory standard states the maximum the board can take. For example, a board with a standard of 1800 DDR3 can take anything below the specified frequency.

[AhMunRa]

Haswell that's not entirely true. It will take anything below the standard that fits the slot, if it has an improper pin out it won't work. IE, ddr2 will not fit a ddr3 slot.

[Haswell]

Memory standard on motherboards denotes the type of memory it is compatible with and the maximum supported frequency, yes. Never said anything about interchangeable compatibilities. Besides, the cutout on the PCB are different in the generations, wouldn't be able to fit DDR2 memory in DDR3 slots anyway.

[kls85]

What you guys are talking about is not about standards, just the type of ram a motherboard supports.

A memory standard is set by JEDEC. What they do is set a set of specific to a type of RAM and manufactures need to follow those specs.

Manufactures that don't follow those spec, then these types of RAMs won't be validated by JEDEC.

e.g. (Can't remember the exact standards)

JEDEC set the standard for DDR2 to run at 800MHz.
If a memory maker decided to make DDR2 run at 1066MHz, then this type of RAM would be consider as "overclock".
Take a look at your motherboard manual, you'll notice next to some ram specs a "(o.c)". This means it's not a standard

Here is a motherboard example, notice the (o.c) next to DDR2 1066MHz
link

@OP
If you have DDR2 @ 1066MHz, it will still work with your board, it will just down clock and run at 800MHz.