I'm building my first gaming pc from scratch and plan to order the remaining parts this weekend. (yay!) I've tried to keep my budget down, and settle for middle-range components with upgrade-ability. I currently have the case, mobo, cpu and gpu.
I'm looking for feedback on my PSU and RAM choices.
In particular: Is Seasonic worth the money, or should I go with something else? I do not want to risk my system to save $30.
And does it actually matter if RAM is configured in multiples of 3? Mostly I'm thinking about when I upgrade the RAM in a couple months - is it really better to have 6GB than 8GB? (or 12GB over 16GB)
AZZA Helios 910 Black Japanese ATX Mid Tower
ASUS P8P67 (just plain jane, not PRO or LE)
Intel Core i5-2500K
XFX Radeon HD 5770
Western Digital 500GB 7200RPM SATA
If you configure your RAM in multiples of three then it won't run in dual channel mode, as Sandy Bridge motherboards don't support triple channel RAM this means they will have to run in single channel mode. Single channel is very likely to have a performance penalty compared to dual channel, so in the future you should plan to go up to 8GB rather than 6GB.
Compared to that Corsair CX, yes the Seasonic is worth the extra money, it is much more efficient, it has higher quality internal parts, it's got a higher temp rating. So IMO you'd be 'risking your system' if you tried to save $30 by getting the Corsair; it is definitely not something that I would do.
One possibility to save money without sacrificing quality is to consider the Antec High Current Gamer HCG-620, which is based on the Seasonic S12II Bronze 620: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
It is $2 cheaper, doesn't have a shipping charge and has a potential rebate of $15. It also has a longer ATX12V/EPS12V (CPU connector) cable.