yes to both.
as for memory, i've never had much luck running the k7s5a with ddr ram. maybe it's just me but this board has never been stable for me at 133 fsb and ddr memory.
i did build a duron / sdram system on a k7s5a for my father that is stable, however
for performance you want ddr ram IF you can get the board stable.
safe bet to get the board stable is sdram.
this is only my experience. others have had good luck with the k7s5a running ddr ram. i think that it's pretty much how good your power supply is and if you get a good mb from ecs.
there are good forums on the k7s5a here and at ocworkbench.com
good luck