I have a blue and white yosemite and it's running os 9.2 with 448MB of ram (64MB+(3)128MB). I was wondering if it would make much difference to buy two 256MB sticks of ram. Since there are only 4 ram slots, I would then have 768MB. Would this have a noticeable performance in the computer(448MB to 768MB). I will be running some design programs, such as photoshop, illustrator and quark. I was planning to upgrade the OS to panther as well. Would 448MB of ram be sufficient to run panther? Any help would be great. Thanks.