I am running at the stock clock of 2133. Getting overclocking motherboards, CPUs, and memory didn't make economic sense.

It's unlikely your RAM will run reliably faster. RAM is extensively binned.

Thanks, Mark. I really appreciate your evaluations. I will talk to Micro Center tomorrow about trade-ins.

So looking at the local offerings at Microcenter, there are a couple of possibilities. I can move up the line with Corsair for a reasonable price bump. They also have the G.Skill Aegis for a bit less. Again, I am looking at 2 x 8GB, so I don't know how the dual rank question shakes out.

The only other difference I see is that the Corsair seems to be 1.2V versus 1.35V. In reading around the web I have seen some folks preferring lower voltage so as to go easy on the memory controller. I would appreciate any views on this issue.

The lower voltage is probably better, but it's the 3000+ speed that will matter more.

You'll probably end up with single rank RAM. If you have the specific model numbers it may be possible to figure it out before buying.

The voltage usually depends on the speed. 1.35v kicks in with some lower latency 2666 kits, and pretty much everything 2800 upwards. I wouldn't worry about it either way.

Most recently I got Kingston HyperX 2x8GB 2666 because they were dual rank, and I didn't want the higher speed compatibility problems. You can look up the part number and they do list the rank configuration.

I did come across some Crucial Ballistix 4GB modules which were mis-labelled as dual rank though.

The G.Skill part is F4300C16D16GISB

The Corsair is CMK16GX4M2B3000C15
[URL]http://www.corsair.com/en-us/vengeance-lpx-16gb-2x8gb-ddr4-dram-3000mhz-c15-memory-kit-black-cmk16gx4m2b3000c15[/URL]

Looking at the Corsair site, it looks like the 1.2V listing at Micro Center may be an error. 1.35 V looks to be pretty much universal at DDR4-3000.

EDIT: Cross post. I have not found if Corsair lists the rank config. However, the 1.2 V rating only seems to apply at SPD 2133. XMP bumps it to 1.35.

Sometimes the listings can get confused, and they might list 1.2v which the modules could do at basic 2133 speed.

[QUOTE=mackerel;451054]Sometimes the listings can get confused, and they might list 1.2v which the modules could do at basic 2133 speed.[/QUOTE]
Thanks! That does seem to be the case, here.

And yes. Micro Center will still exchange what I have. :smile:

1.35v is probably the max safe voltage(some would say 1.4v). Given that there are so many 1.35v kits it can't be that damaging. 3000 was the sweet spot when I bought.

I have the trade lined up. I just have to drive over to the store. Thanks for all the responses.

I exchanged the XMP 2400 parts for XMP 3000. Strangely, running a single, four thread worker is slightly (0.10 to 0.20 ms) slower, now. Would the increased speed show up if I were running more than one worker?

EDIT: I did notice last night that the current RAM shows Single ranks in CPUZ>SPD. I don't know what the previous RAM indicated. I am supposing that it would be the same as these are from the same Corsair Vengeance LPX product line.