I'm looking to upgrade the cache on this board to 512k (primarily because I'm pretty sure the current 256k isn't working at all anyway)

The board settings are: http://th99.classic-computing.de/src/m/E-H/32703.htm

If I have my research correct, I'm thinking I need 4 of these:

And one of these (as the tag):

Is this correct?

Thanks in advance,

E