Two measurements define a saw chain.
Pitch distance between the pins that hold the chain together. usually expressed as either a fraction 1/4" 3/8" 1/2" or a decimal .325" ,404"
And the gauge which is the thickness of the drive teeth and subsequently the thickness of the cutters and usually expressed in thousanths of an inch .050" , .063" etc
If you are thinking of running the 1/2" pitch chain ( .500" ) on that saw, forget it.
The next size up is 3/8 low profile which is marginally bigger than the ,325 and your saw will handle that easily.
It might just be able to cope with a 3/8 standard chain, but only if you are cutting soft woods.
It is always best practice to over power rather than over size as once the saw starts to bog down under heavy loads it just stops cutting and jambs.
As you go up in chain size you generally go down in bar size thus reducing the load on the saw.
Bigger theeth men bigger cuts which mean bigger loads on the saw.
If speed is what you are after then you need to look at thinner chain, which cuts less wood so you can saw through a log faster.
Chain with names like Pico, & Microlite cut the fastest. but because the channel they cut is very thin they have specific uses.
So what are you cutting ? , type of wood ? feling or limbing or logging ?