The heat sink mounting screws are set in arms that end up applying the pressure. Without that pressure, pretty much no laptop heat sink would work well.
You don’t need to worry about the correct pressure unless you’re designing a whole heat sink and mounting replacement.
1 psi is about 6.895 kPa 1 kPa is 1000N/m^2 the 7840/7940HS had 178 mm^2 which is 0.000178m^2.
1.22731N/0.000178m^2=6895Pa=1psi, so you need about 42N on the heat sink for the PTM to work properly
That is what I was trying to get at. If the PTM needs 30-40psi, we are going to need torque screwdrivers in order to get the PTM replacement done correctly.
I think you are overthinking it.
Just tighten the heatsink down as far as it will safely go… dont over-tighten it and snap off the screws… just tighten it down snug - same as you would for any other paste.
The torque settings are more for industrial server applications (what PTM7950 was designed for)
Funny Thing, i closed the Vents of the dGPU today, with black Vinyl. i only left open two of the Squares of each Vent.
I wanted to check how it increases the Pressure and Airspeed through the CPU Cooling Vents, Effectivly it reduces the Noise of the Device alot and keeps the Cpu a teenie tiny bit cooler.
I will leave the Vents closed for my stationary Work with my eGPU and just open them if i am traveling and i need the dGPU.
There are technically two issues. One is the liquid metal escaping.
Two, which I think is more important, is the bonding (of the silver shim with the heatsink).
On a CPU only workload (cinebench) I get 43/44W consistently with multiple versions of the paste (my Thermal grease, the original liquid metal, and the Arctic Silver).
When I am playing a game with a GPU+CPU load, the bigger active area (of the GPU+CPU) caused the hotspot temperature to drop.
Furthermore, as @PSierra117 has demonstrated, replacing the shijm and modding the heatsink allows for substantially higher thermal transfer, of 62W in cinebench.
This is near 50% higher than stock or Heatsink Compound or Arctic Silver, and still 10% higher than the seemingly PTM results.
Not surprised. GIven that the fan blows on the separate GPU and CPU heatsink, but only one is doing the work.
This is good for expansion shell users, who would otherwise want to believe they are losing out significantly on the fans’ horsepower. Not really.
I do get higher than 14500 (probably near 15000 territory), 7840HS. 3992MHz, sometimes 4017.
But it’s still only 42Watts.
I kept saying, “don’t worry about score, just check power counter”
Seems like the higher-pitched sound is coming out of the inner slots in thos back vents per this post. I closed the same 4 inner slots on both sides and it also helped me, so I’d recommend rather leaving the outer slots open.
If LM is no longer used, can’t you just remove the shim? When I searched about vapor chamber most results were vapor chamber vs heat pipe, not vapor chamber & heat pipe. The FL16’s heat transfer route is like CPU → shim → vapor chamber → heat pipe. Heat transfer is like electricity conduction, putting resistors in series adds up the total resistance. Is using vapor chamber between the CPU and heat pipe really a good idea?
Yeah I just tested my RMA board that I’ve had for around 3 months and got similar results compared to the numbers I got when I first installed the board. I filled out the PTM 7950 request form, so we’ll see how it goes when those start shipping.
Heat pipes aren’t flat, you loose contact area each time the pipes connect to each other.
The shim/vapor chamber is to make sure the entire die is touching the heatsink assembly.
Without the shim, there is no contact, or you’re relying on thermal material to make up the difference, which isn’t as good as just copper
I’m wondering that if you use PTM7950/7958 do you still need the shim?
Ptm is still thermal paste. It’s not as efficient as pure copper in conductivity. The more metal you replace with tm, the worse results you get
I came across this thread and tried to perform this test on my Batch 1 FW16 machine. And it seems I got the worst results across the thread 
Am I missing something, or the situation is so bad?
prerequisites:
Original FW16 180W charger - connected
Battery - 100%
Performance mode is on
results:
Cinnebench result - 11858
During the test: CPU package power max - 27.5W
Core 4 reached 100 degrees C
I think that’s the lowest score that’s been reported on this thread so far. I’m sorry to hear that your performance is likely worse than it started after all that work. Thanks for sharing though so the rest of us can learn from it.
At the manufacturing level, sure. DIY? I really doubt it.
It would be nice if Cooler Master would revamp the design of the vapor chamber so it would contact the CPU die without need of an added shim. But as it stands, I doubt you could just remove the shim and still have everything contact properly.
thank you for your reply.
Now the only question I have: will the replacement to PTM7950 help, or it’s something more severe, and I should write straight to the customer support? Could the improper LM thermal application harm the CPU somehow?
Just removing the Shim for direct Contact does not work. The Contractpressure and Angles are not fitting for a full contact to the Die.
Updated my previous support case asking to rma for a ptm board -
“ Thank you for your reply. Currently, the implementation started at the factory in mid-November, but there is still an existing stock of mainboards without PTM pads that need to be utilized first.
If you would like a PTM pad, you can fill out the request form via this link: Phase Change Thermal Pad Kit Request form “
So people with issues are now basically stuck until next year and even then you can only get the pad kit.
@Destroya @nrp - Is that correct? Issue boards have no priority?
As there are no old boards without this issue I don’t see why they should 
Sending us the PTM kits seems faster and more cost effictive
Whats your Problem? You sent the Request and you get PTM, you vould have already bought yourself some.
The procedure of getting it is not an RMA but the Typeform Request.
