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How much you feel the difference beatween cl14 3000mhz and cl15 3200 mhz memory?

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How much you feel the difference beatween cl14 3000mhz and cl15 3200 mhz memory?
I am trying to pick a ram for my PC.
getting 128 gigs. 

Motherboard i have is https://www.asrock.com/mb/AMD/X399 Taichi/index.asp
Memory i was looking at was this
https://arvutitark.ee/est/tootekataloog/Arvutikomponendid-Malud-lauaarvutile-DDR4-malud-lauaarvutile400/GSKILL-Trident-Z-RGB-DDR4-64GB-4x16GB-3000MHz-CL14-135V-XMP-20-296955

and those
https://www.hinnavaatlus.ee/products/Arvutikomponendid/Mälud/ebac8f4bc96c30892d8e36e37216523d/?sort=-views

Question is how huge difference there is beatween for example cl14 and cl15 
I was comparing cl14 3000 mhz and cl15 3200 mhz

for my AMD Threadripper amd threadripper 1950x

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4 minutes ago, ISUther said:

How much you feel the difference beatween cl14 3000mhz and cl15 3200 mhz memory?

Probably none at all. You can most likely adjust the timings down on the 3200Mhz memory, or increase the frequency on the 3000Mhz memory... So either should be fine.
Since you're going with 128GB, I'd go with whichever kit is cheaper.

 

What work exactly will the machine be for?

CPU: Intel i7 6700k  | Motherboard: Gigabyte Z170x Gaming 5 | RAM: 2x16GB 3000MHz Corsair Vengeance LPX | GPU: Gigabyte Aorus GTX 1080ti | PSU: Corsair RM750x (2018) | Case: BeQuiet SilentBase 800 | Cooler: Arctic Freezer 34 eSports | SSD: Samsung 970 Evo 500GB + Samsung 840 500GB + Crucial MX500 2TB | Monitor: Acer Predator XB271HU + Samsung BX2450

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The higher clocks on the 3200 kit will make the infinity fabric run faster as well, which should improve performance slightly. And of course if you run any workloads that actually benefit from the extra memory bandwidth.

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