Sims 4 + All Expansions PC Requirements

@gemski2012  The motherboards in the B450 category are all about compromises—getting the features you really want and not minding if the ones you don't need aren't included.  The best choice will also depend on price, since a board might be worth an extra $20 but not $40, depending on how much you're looking to spend overall.  The high-quality boards are the X570 models, which have newer features like PCIe 4.0 support that you wouldn't be able to use now but might in a few years.  Of course, those boards start at double the price of the B450 models, so it might not be worth it to you.

Are you buying from somewhere in particular, or are you doing comparison shopping?  Since you're building this PC yourself, you might want to check out PCPartPicker.  I don't know how often the Australian site updates its prices, but the American one catches price changes in a couple of hours.  You can narrow by category and feature and then sort by price and see the cheapest deal available.

https://au.pcpartpicker.com/

The micro ATX boards will be cheaper but have fewer features.  They're also smaller, obviously, which means they can be a bit harder to work with when building, especially if you haven't done it before.

There are quite a lot of boards on the list, and I don't have time to check them all out—my existing knowledge of AMD boards isn't great—but if you pick a few in your price range, I can look them up.

With memory, it's often easier to pick the motherboard, check its list of supported RAM, and then pick one from a good brand that isn't overly expensive.  The performance from the top manufacturers will be the same regardless, so you can choose based on price and board specs.  And yes, TS4 won't really use the faster RAM, but an AMD CPU will benefit in general.

As far as the graphics card goes, I meant that an Nvidia 1060 or AMD 580 will likely always run all packs on ultra settings, and a 1660 ti (or even just a regular 1660) will give you a buffer above that.  EA's listed requirements for TS4's more demanding EPs don't take into account the cost of running them all at the same time, but that's what I was assuming you wanted when I wrote out the requirements.

By the way, you certainly don't need a 650W PSU for any of those cards.  Even a 1660 ti would be fine with a 500 or 550W model.  But if you're looking to futureproof, and 650W isn't that much more expensive, then it's a good choice.