DLoa Posted March 15, 2022 Share Posted March 15, 2022 My i9-9900k cpu is delided for a direct die cooling setup using Conductonaute liquid metal, foam barriers and Der8auer OC (9th generation) frame in my Eurocome Sky X7c Clevo chassis laptop, which has a unified RTX 2080 GPU - i9-9900k CPU heatsink. I used a vaccum chamber 3mm thick on top of my cpu die. The thickness of the intel IHS top is 2.30mm after the STIM has been removed. The effective STIM tickness is assumed here to be around the reported 0.2mm since I lost the measurement made before delidding. This means that the original the z-height before deliding was about 2.5mm and therefore using a 3mm tick vaccum chamber increased it by up to 0.5mm. Note that, although the temps are fine after deliding, the GPU VRM temperatures are not known and I am conscerned this results in poor contact with heatsick or would require in places much thicker thermal pads rendering less efficient in hear transfers comparared to original setup. Project: In order to offset this 0.5mm increase in height and to improve both cpu die heat transfer (reduction of silicon top layer) and the contacts tolelerances with the cooling unified system, I am planning on lapping the CPU die using NLap tool by NUDEcnc and checking thichness with micrometer during sanding passes (400-2000 grit). With a cpu die 0.88mm above PCB and a tolerance of 0.1mm of OC frame below below the silicon die, would require that the OC frame base be sanded down by the same amount in order to preserve optimum direct die contact. Question: Roman / Der8auer initially reported temps after sanding/lapping down by 0.2mm but mentioned that the ticker silcon would be sanded down further 0.4 or more. Anyone has tried sanding their cpu die down by 0.4mm or more? Would 0.45-0.50mm be accpetable? Thank you for your inputs. Eurocom X7c (Clevo P775TM1-G): CPU: Delidded i9-9900K @ 3.6GHz (direct die cooling with vacuum chamber mounted onto unified cooling system, all with liquid metal), RAM: 64GB (4 x16Gb Kingston Technology HyperX Impact 2666MHz DDR4 CL15), Main Storage: m.2 Samsung SSD 970 EVO Plus 1Tb with Windows 11 Pro 64bit, Secondary Storage: 2 x stripped Seagate FireCuda 2TB Solid State Hybrid Drives Performance SSHD (ST2000LX001 - 1RG174) GPU: NVidia RTX 2080 8Gb GDDR6 (liquid metal). Link to comment Share on other sites More sharing options...
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