What is the thickness of the thermal spacers for the GPU memory?

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iMac Intel 27" Retina 5K Display (Late 2014 & 2015)

모델 A1419 / EMC 2806 / Late 2014 또는 Mid 2015. 3.3 또는 3.5 GHz Core i5 또는 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 또는 3.5 GHz Core i5 또는 4.0 GHz Core i7 (iMac17,1) 모두 Retina 5K 화면 장착

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zaa495 @zaa495

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What is the thickness of the thermal spacers for the GPU memory?

Good day,

I disassembled iMac 5K 27 Late 2015, M395X 4Gb to replace the thermal grease and clean the cooling system.

Tell me please: what thickness should there be thermal pads for video memory chips?

I bought these here Thermal Pad material for All Coolers

Thickness 1mm. Tonight I'll make an iMac and see :-)

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Zaa495, what have you discovered about the needed thickness of a thermal pad for your iMac? Is it 1mm or different?

I have to order one tomorrow, but don’t know the right thickness. For iMac 27” 2017.

Mitja Masten 의 2019년 7월 7일

@zaa495 - Thats what I use for pads you might as well order all three sizes just in case.

Dan 의 2019년 7월 7일

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

Should I use 0.5 mm or 1 mm thermal pads?

Mitja Masten 의 2019년 7월 21일

I would use the 1 mm pad material as you do want it snug.

Dan 의 2019년 7월 21일

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Dan @danj

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Apple (Nvidia) has used a few different chips on both the GPU boards and logic boards so I can’t really give you an exact size here. And I haven’t needed to replace the newer retina iMac’s pads yet.

For reference: You’ll need on the older chips (GPU board in 2008/9 systems) .5 mm as they stand a bit high and the newest chips will need a thicker one either 1.0 mm or 1.5 mm.

The best way here is to measure the gap. Dry fit the heat sink and then slide in a few pieces of card stock or use a feeler gage into the gap. Then measure the collection of pieces needed and use the next size up as you do want it snug.

Please let us know what you used.

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Zaa495, what have you discovered about the needed thickness of a thermal pad for your iMac? Is it 1mm or different?

I have to order one tomorrow, but don’t know the right thickness. For iMac 27” 2017. — Mitja Masten
@zaa495 - Thats what I use for pads you might as well order all three sizes just in case. — Dan
iMac 27” 2017 has a gap between VRAMs and cooler plate around 0.75mm.

Should I use 0.5 mm or 1 mm thermal pads? — Mitja Masten