Is it compatible?

[Xador]

Hello, let's say I'd try to stick a 4 gb 400 mhz memory stick into a motherboard that supports memory clocks like 1600 mhz and so on, would it work?

 

[davcon]

Nope doesn't sound right to me.
Most ram of the 400 mhz variety is DDR2(200-pin) or earlier.
Boards that support 1600Mhz ram speeds are generally DDR3.(204-pin)
What are you trying to do exactly?
Be specific! makes and models.

 

[willard]

I'm with davcon here. The way the question is posed suggests that the OP doesn't really understand the question he should be asking instead.

 

[h3sham]

you couldnt even seat the ram in the slot if you tried so it wont work that ram is a DDR2 and the MB's DIMMs are DDR3