The difference between single channel and dual channel RAM is insignificant.
https://m.reddit.com/r/buildapc/comments/1fcs77/discussion_ram_single_vs_dual_channel_speed/
Yes, a little more power is needed for SLI, although most users find putting a single GTX xx70 or xx80 runs most games better than 2 way xfire/sli
Persribed pills, if you want to look at different size PSU's, here's my recommendations:
550w
650w
750w
850w
Meanwhile, the notion that a 2 x R vs. a 1 x R ram configuration is not supported by most RAM research these days. It's partly due to the way RAM of yore worked, and partly due to a fear that if one RAM stick blew out, you'd still have a working one. The biggest factor deciding between (in this instance) a 2x8 vs. a 1x16 is price. We are so used to seeing RAM sticks sold in pairs, we have been conditioned to think that's how they need to be bought. I know I'm more likely to upgrade RAM before a GPU, so if I'm running a mobo with 64 gb over 4 slots, there's no problem filling one up with 16,getting 16 more at another time, and keeping on until I have 64 gb, without having to dispose of old RA sticks. It's actually a greener approach to computer building. One small step...
At the end of this article
Click here it states: As for whether it's "worth it" to get a kit of two, the answer is generally going to be yes -- but primarily because it's rare not to find a good deal with two sticks. If you're on a budget or an ultra-budget and are trying to spare every $5 or $10 you can, then perhaps grab a single stick of RAM. It feels so wrong saying that, but we have to trust the results of this test, and the results say that it simply doesn't matter for those types of users. Anyone building a ~$500 or cheaper system shouldn't spend the time of day being concerned about 2x4GB vs. 1x8GB as long as the price works out in their favor. Price is the biggest factor here, and with recent fluctuations, you're just going to have to check the market when you're buying.
Then there's this
article that concludes: Conclusions
Besides that, theoretically, the dual-channel mode doubles the bandwidth between the CPU and the memory, it does not mandatorily result in a perceptible impact on the performance of a specific program. In most of the games we tested, there was not significant performance gain when we enabled the dual-channel mode.
In some cases, there was actually a performance drop when the dual-channel mode was enabled. It can be a simple statistic fluctuation (the ideal was to repeat each test dozens of times in each configuration to avoid it, which is not viable) or even a behavior of the CPU memory controller, working more optimally (maybe with smaller latencies) in the single channel mode.
The fact is that, in the configuration we used an in the games we select, there was no advantage in using memories on dual-channel. This means that, in some cases, when an 8 GiB module is less expensive than two 4 GiB ones (for example), you can install only one memory module with no fear of losing performance.
But please keep in mind that those results apply only for the hardware and software configuration we used. With a different setup, results may be different.
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