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1. Turo boost basically means that the processor will normally run in 2.3 GHz mode, but can self ovreclock itself up to 2.8 Ghz automatically for certain durations without damage to the procesor. It's basically an energy saving gimick.

2. There is a whole range of I5 and I7 processors. you also have to take into account the socket type. For example. a socket 2011 I7 is going to run circles around a comperable socket 1155 I7. That being said, usually the difference between an otherwise comparable I5 and an I 7 is the I7 will often have hyperthreading, or additional virtual cores. That means that a quad core I7 shows up in your computer as an 8 core processor. They don't actually give you 4 additional full cores, but you will see about a 25% boost in machine performance with the I7 over the I5. The I5's also sometimes come in lower core number counts, so you have to be careful you get the right number of cores. The I3's are basically an I5 with a video card built in and usually a lower cache and core count. Speedwise though they are comparable to the I5's in many cases.

EQ2 likes lots of cores, as fast as you can get them. EQ2 also likes Nvidia video cards better than AMD / ATI, but it will run on both adequatly.

AMD vs Intel basically boils down to the AMD processors are going to be about 10-20% slower than their comparable Intel processors if we ignore the intel extreme edition processors, and 30-40% cheaper. Basically there is an argument for going with an AMD for the cost savings. I personally run Intel in all my computers, but you do pay for what you get.

3. I tend to prefer the Nvidia cards. The 6xx series cards just were released, so you can pick up a GTX 560 or 570 very inexpensivly at the moment.

Of the two computers you linked, the top one is very, very yellow and may cause retina damage if you look at it too long. It's also probably the newer processor, but its a slower quad core than the second link. THe video card in the first link is better than the one in the second. Either of them will run EQ2, and the pricing isn't horrible for what you get.