I am not a very experienced builder, and I haven't done it quite sometime. My old system died on me and I decided to spoil myself a bit and upgrade.
The one thing I overlooked was the power supply and I am very lost. I went to a component sales store and the tech was trying to tell me I need over 1000W just based on my video cards. I'm pretty sure I saw a system builder marathon with similar components built with a 750W power supply.
80PLUS helps with power use and efficiency. I can't comment on the impact of having a good rated PSU on my bill because I don't pay for it
As for modular PSUs, yes they are indeed worth the price. The ability to remove cables you don't need helps a lot when you have cases with poor cable management, or not enough space.
I agree, get modular. I didn't go for one because the bill for my build was going a bit over my budget.
I have a similar build (sapphire 6850 and regular 2500) and after checking a few psu calculators online, the max I would get is like 600w, but I went with a 750w because I'm planning on crossfiring in the future.
If you're still unsure, calculate your power needs by googling psu calculator, and do it with several different ones to get an idea.
Also I reccomend maybe getting 8gb ram instead of 4gb.
Yes, over 750W would be overkill. Like I said, I'm getting it because I'm planning on crossfiring.
I waited for my stuff to go on sale, so if you're going go with andy's advice and you're on a budget but also not in a rush, wait for good ram to go on sale. If the ram slots on your mobo are dual-channel, wait for a pair of 4gb (2 sticks of 4gb that is) to go on sale. The extra 4gb does make a difference and you'll be glad you got it.
Any particular brands people trust? I've always used Corsair, but now there are a lot of names out there (yes, it has been a very long time for me).
I like the connection cables on the Corsair units, and I trusted the brand. Other companies offering the easy to disconnect cables now too?
I used a Corsair VX550 for my first build. It seems that a lot of people also trust Corsair as well, so you can consider that.
However, if you've got money to spend a Seasonic is apparently one of the best. Many of them are 80PLUS Bronze at minimum and if you step up to ones like X850 or X650, you get 80PLUS Gold. However they do command quite a premium ($220CAD for X850).