Resource Requirements for Zend core

["Roger Vicker, CCP" <rv-tech@xxxxxxxxxx>]

I am looking at an upper Model 800 with 1GB of memory at V5R4 that is 
purring along quite fine serving their static web pages. The system has 
Domino (7.0.2 going to 8.0.1 next week with 30 users) and about 5 power 
users plus a handful of light inquiry users. They are looking at going 
to a Power6 and 6.1 but that won't be till late summer.

Would it be a mistake to add the Zend Core load to this system to serve 
the 1 (one, singular) PHP island they want on their new home page or 
will the resource overhead be minimal enough to not wait for the new box?

Thanks.

Roger Vicker, CCP