problem with Architecture Selection

[badguy]

i have installed open bsd on a server

(http://www.supermicro.com/products/s...5A-H.cfm?typ=H)

how do i know which Architecture Selection for OpenBSD 4.5 to use among (alpha amd64 arm hppa i386 mips64 powerpc sh sparc sparc64 vax)?

I am asking this becasue I get the following error message when i try to install rrdtool

Can't install rrdtool-1.2.30: lib not found freetype.16.1
Dependencies for rrdtool-1.2.30 resolve to: libart-2.3.20p0, png-1.2.33
Full dependency tree is libart-2.3.20p0,png-1.2.33

and I have used i386 machine for my package path (i.e. ftp://ftp_path/pub/OpenBSD/4.5/packages/i386/)

thanks