Actually kinda new to graphics cards. I am planning to buy imac 24. core2 duo 3.06 ghz , 1tb hard drvive and there are two options for graphics card. ATI Radeon HD 4850 and Nvidia Geforce GT 130. I am having problem in selecting between the two graphics card as I might use imac for some heavy gaming. Kindly suggest....
Go for the HD 4850. But if your going to be gaming your making a huge mistake getting a mac. They don't support many games even when they are running windows. You should build yourself a gaming pc. I can tell you from experience for the money you spend on the mac you can get a pc that has alot higher specs and is much more capable of doing what you want
DO NOT BUY THE MAC!!! I am actually Apple Certified and have seen a lot of the 20 inch versions of the new iMac. We've got 150 or so of these, and so far have had a decent amount of problems. I work for a school district, and my boss in fact said he is not buying another 20 inch iMac. Heating issues, computer sometimes shut off at random, Apple claims replacing a cable may resolve some of this, but a lot of the time, if you need say a logic board replacement, you are looking at almost the price of the machine for repair.
So in short, do not get that iMac. If you want to game, get a pc. Again, this is from someone who actually has their Apple Certification.