Correct Ram?

is correct ram 17" imac g5 1.8 ghz 80gb sata?
http://www.1stchoicememory.com/catalog/configurator.asp?b=apple&m=22725

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this cheaper fit?
http://www.ebay.com/itm/512mb-apple...ltdomain_0&hash=item3a66aa0481#ht_2465wt_1165

 

both work, if want run 10.5 on imac i'd suggest max out 2gb.

 

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