I think you should replace the PSU. While 500W is technically sufficient, that supply is not 80 PLUS certified or from reputable brand. It does not have a flat efficiency, but a typical "bell curve" response so it will only deliver peak potentials at one load (top of the bell) value. But computers present a wide variety of loads, depending on what the computer is doing, from near no-load at idle, to full load when taxed. A
80 PLUS PSU is certified to ensure at least an 82% "flat" efficiency rating across "all"
realistic loads. I prefer Corsair, Seasonic, and Antec PSUs, but it should be noted achieving a high, flat efficiency across a wide range of loads requires quality design, quality parts, and quality construction - regardless the brand name stamped on the case.
As for your RAM, you can check the
motherboard's QVL (qualified vendors list) to ensure your RAM will be compatible. There are too many RAM makers and models for motherboard makers to test them all so you don't have to buy from the list, but you do need to buy RAM with the same specs as listed RAM. There is a CPU QVL too, and you must buy from that list to ensure the board supports the CPU.
Also, you most likely need to buy a new Windows license because for licensing purposes, a new motherboard is considered a new computer - not to mention you totally changed from AMD to Intel, so it is a new computer. A common misunderstanding among many users is they assume they can use their old Windows license on a new computer, or with their upgraded motherboard. The fact is the vast majority of Windows licenses are NOT legally transferable. Only the "boxed" full
Retail license can be transferred to a new computer (or upgraded motherboard). It is
illegal to use an OEM/System Builders license that came with or was purchased for one computer on another computer. A disk “branded” with a computer maker’s brand name, or is labeled with “OEM", "OEM/System Builder”, “Upgrade”, “Academic Edition”, or "For Distribution with a new PC only", is
not transferable to a new PC (or upgraded motherboard) under
any circumstances. These OEM licenses are inextricably tied to the "original equipment". And most importantly,
as users, we agreed to the terms of the end-user licensing agreement (EULA) when we decided to continue to use the software on the original computer. And that makes it
legally binding.
With that in mind, if you need to buy a new license I recommend 64-bit (because you have more than 4Gb) Windows 7 or Windows 8, or one of the many free Linux alternatives.
Note I am just the messenger here ensuring you have all the information needed to make informed decisions so you are not unknowingly doing something illegal.
