I know what the Micro ATX means.
I think the smaller board size will not dissipate heat as well.
My point is this. Out of all of the Micro Boards I've seen (using the
AM2+ slot), they all have a restriction that is not so widely known. They
state that they can handle AM2+ CPUs but in fact they handle AM2+
processors that don't draw over 95W. Many people are falling into that
trap of building their computer and later finding out that there burning
out the board. The AMD Athlon 64 X2 6400+ draws 125w and so does the
Phenom 9850 Processor.
So the point I was trying to make earlier is that it doesn't matter so
much if the Power Supply has 550W, 650W or 800W of power. These may all
be appropriate power supplies. However, if the motherboard Socket maxes
out at 95W.... you better not run the AMD 6400+ or Phenom 9850.
The example below shows a motherboard and cpu, which you would think is
compatible. But they are not.
Example:
Processor:
http://www.newegg.com/Product/Product.aspx?Item=N82E16819103280
Click on specifications. You will see that the Thermal power is 125W
Now look at the below motherboard (XFX Geforce 8200GPU)
http://www.tigerdirect.com/applications/searchtools/item-Details.asp?EdpNo=3939759&sku=P450-9120
This manufacture is one of the few that actually tells you that you can
run CPU's up to 95w max.
These two are NOT compatible