I see in the NetBSD Alpha FAQ:

What video cards are supported by X11?
At this time, the following graphics cards are supported:

PCI tga ZLXp-E1 PBXGA-AA 2 1280x1024 8
PCI tga ZLXp-E2 PBXGA-BA 8 1280x1024 32
PCI tga ZLXp-E3 PBXGA-CA 16 1280x1024 32
PCI tga PowerStorm 3d30 PBXGB-AA 2 1280x1024 8
PCI tga PowerStorm 4d20 PBXGB-BA 16 1600x1200 32

Does this mean no other cards will work in X under the NetBSD Alpha port?

thanks