64 to 128 GB ram, worth it?

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Currently running 8x8 GB 2666 MHz Corsair Vengeance kit on a new X399 platform but am only seeing 2133.

Contemplating a huge investment in entirely new GSkill Flare X 2999 8x16 GB kit.
Besides the extra headroom I've seen some tests which claim up to 50% performance improvement in certain simulations when going from 2133 to 3200.
Anyone else considering going up to or is currently running 128 GB?
Is it worth it?
Thanks
Edited by art3mis - Dec. 20, 2017 16:06:22
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I've only run Houdini on a 16GB machine.

Even though I've heard you can get by on 32GB and also heard one saying if $ is a concern that 64GB can be a sweet spot;

That I would probably go for 128GB on my next rig anyway.

The reason being is that even with only having worked with 16GB I get the sense that no matter how much you have, you can certainly up your ‘ambition’ to match and make use of what you have,e.g. larger size sims, more concurrent sims, higher resolutions, etc.

…but perhaps you should keep an eye on this thread from those who have actually used rigs with varying amounts of ram
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art3mis
Currently running 8x8 GB 2666 MHz Corsair Vengeance kit on a new X399 platform but am only seeing 2133.

Have you enabled the XMP profile for the memory in the BIOS/EFI motherboard setup? That's usually the issue with lower memory speeds.
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