Hi Greg,
As the second answer states, you cannot install PC133 SDRAM in a motherboard designed for DDR RAM.
While the DIMMs are the same physical size, you will notice 2 physical differences.
First, is the pin count.
Second, they have different notches on the socket edge to prevent you from installing the wrong style of DIMM in the wrong socket.
Next, you need to answer one question before choosing RAM for this motherboard.
Which specific Intel CPU are you going to use?
According to the supported CPU page at Intel's site, (answer 1) this motherboard does NOT support the existing 1.5GHz CPU.
Further, is the old CPU a socket 423 or 478?
You can't swap CPU types between sockets.
Intel list a number of 1.5GHz CPUs. Most are socket 423.
http://processorfinder.intel.com/scripts/list.asp?ProcFam=483&NoNav=NO&CorSpd=4999&SysBusSpd=ALL&MfgTech=ALL&step=ALL&cache=ALL&PkgType=ALL&btnFOS=Filter+on+selections
This motherboard supports:
"Four 184-pin DDR SDRAM DIMM sockets
Support for DDR 400, DDR 333, and DDR 266
Support for up to 4 GB of system memory"
DDR 266 is for only the 400 MHz FSB
DDR 333 is for 533 MHz FSB
DDR 400 is for 400 MHz FSB.
Since the motherboard does support a 400 MHz FSB, you might get lucky if you have a socket 478 CPU.
Chas
