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Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K display. Refer to the older iMac Intel 27" Retina 5K Display (Late 2014 & 2015) guides as the system is very similar.

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VRAM Modules Pads or Paste

Going to upgrade the Kaby Lake CPU to a i7, upon reassemble should I use thermal pads or thermal paste on the VRAM Modules of the GPU, if pads what thickness should I use 0.5/1.0/1.5 or 2.0, like the ones used by EKWB on there GPU waterblocks, if paste should I go with K5-Pro, or the same thermal paste I use on the CPU Thermal Grizzly Kryonaut/Arctic Cooling MX-4.

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Normal thermal paste will work just fine.

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4 Comments:

If using thermal pads, what thickness should I use?

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Has anyone measured, please? I have to order right thickness and delivery is like 10 days.

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iMac 27” 2017 has a gap between VRAMs and cooler plate around 0.75mm.

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Hi,

so a squeezed 1mm thermal pad should be fine, right? Do you think I need to use a little more thermal paste on the GPU die, in order to have the contact with the heatsink? Thanks.

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John will be eternally grateful.
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