Unless you constantly use Photoshop or another resource-intensive program, you'll be fine with 8GB of RAM. Most games won't require that much memory; the majority of games out today are largely dependent on the processor or video card, if not both.
The "stock speeds" for RAM with the current Intel and AMD setup is DDR3 1066. While DDR3 1333 is slower than DDR3 1600, so far, nothing has indicated that you'll need more DDR3 bandwidth for "stock" operation.
The simplest way to determine the maximum amount of amperage available for a power supply is to divide the total number of watts going through the 12V rail by 12. In the case of the Antec Truepower New, its max load is 62A or 744 watts. Keep in mind, however, that 62A is the most that the power supply can handle; ideally, you shouldn't be coming anywhere near that amount.
The OEM (or Systems Builders') copies of Windows that we recommend are the full versions of the operating system. Full versions are standalone installations, meaning that you can install Windows onto a new system, whereas upgrade versions allow you to install the new OS on top of an existing older version (like Vista or XP). It's much easier for many people to work with the full version of Windows, so stick with that.
You have said nothing that indicates that you need Windows 7 Professional; stick with Windows 7 Home Premium. Get the 64-bit version, which allows you to run 32-bit and 64-bit programs. Upon activation, however, the OEM license key is "bound" to the motherboard and dies when the motherboard dies. In other words, it's illegal to transfer the key to a new computer. But since many people keep their machines for several years, we often recommend the OEM copy due to its lower price.
Socket 2011, aka Ivy Bridge, is the slated replacement for the Socket 1366 Core i7 processors and the X58 chipset. Yes, the older Socket 1366 platform becomes "outdated" upon Ivy Bridge's arrival, but it will take at least six months after its arrival before Socket 2011 fully supplants Socket 1366 as the "enthusiast" lineup of choice.
The integrated GPU in the Sandy Bridge processor acts like the onboard GPU that's part of the motherboard, provided that you have a board capable of utilizing that GPU. I don't know much about the integrated GPU, but it was never designed to replace dedicated video cards for high-resolution gaming.
So basically, the OEM version of the Windows 7 is a 1 time use, whereas the other version I can reinstall it to another machine if I decide to switch mobo? Edit: So if I choose the OEM version, and end up having to reformat my HD, I have no way of reinstalling windows 7? Does that mean I have to back up my system upon installation of Windows 7 first time?
Edit: I'll just stick with the gtx460
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