Hi, A month ago, I was offered the 24" iMac at a very favorable price, and accepted that to be delivered this December. Now, I just recieved word, that they cannot deliver that anymore, but instead they offer the 27". The price range remains about the same, but I am abit wary regarding the specs on the 27" they are offering. The key differences I see between the new and the old, is the cache, which was 6MB I think on the 24" and as far as I can read, only 3MB on the new 27". Both are the Dual Core version btw. Another big issue is the difference in graphics memory - the 24 had a Geforce130 with 512MB whereas the new is equipped with the low ATI 4670 with just 256MB ram. I am not so much into the GPU specs - but in my world, 256MB is less than 512MB Question is, if the overall performance of the ATI card is better than the "old" Nvidia, even if it has less memory. Any insights on this ? I am not a heavy gamer, but I will playing Everquest on a Windows 7 installed on this machine, other than that, the computer will mostly be used for Photoshop work. Even though the design is nicer and it has a larger screen, will I be downgrading in performance if I am to accept this new offer ? Edit: Is it possible to upgrade from 4670/256MB to a 4850/512MB after purchase - or is this a factory pre-configuration only?