Kalman

Hi All, First off all thank you all in the forum to share with us your knowledge and experience! I would like to share with you how I tried to mod my T-shape heatsink to install RTX 3080 to P870DM2. I have a this P870 since 2021 before that I had an P751DM2, then I replaced 6700k to 9700k. I also did the easy BIOS chip access mod. For this work I used: Hot air blower (industrial) Solder paste Dremmel. Screws Isopropyl alcohol, compressed air 0,5 mm, 1 mm, 2 mm, 3 mm Gelid extreme pads Before soldering all parts was cleaned with alcohol. Hot air setup: 500 C, mid flow It took about 8 hours. I have a hot air for soldering but it was useless, had to use 2000W for the work. First I hed to cut down old MXM card holder, because it was touching the new card. I was lazy not to remove the motherboard but I used adhesive tape to hold as many metal dust as I can. After I used compressed air to remove what left of them. There is 2 place where the inductors are too high, for one of them I needed to cut. I just cut with the dremmel to see the solder and try to not cut the heatpipe. I heated up with hot air, then broke it down. I wanted to use the orginal copper(1 mm) for VRAM so I removed them. It took about 20 min to heat up the whole heatsink. I placed the heatsinks on the VRAMS then I saw I had to cut one of them to be shorter. Used and old thermal paste which I am no longer using and "glued" back to the heatsink. I marked the heatsinks places and used solder paste because it is easier to apply on the surface. Then I soldered them to place. It took me about 30 min. For VRAMs I planned to use 0,5mm pads, for test I used the old ones from the GTX 1080. I applied some thermal paste on the GPU to check the distance. I drilled the holes (3 mm) for the new screws, I did not do a good job. It was not well aligned since I not measured just drilled on sight. I planned to solder back one piece of copper on the heat pipe for the 4th screw but I could not do it. So I continued with 3 holes after all. I measured the components height that I think it should be cooled. VRAM Inductor 4mm Vram IC 1mm VRAM 1mm 5V rail inductor 2mm 5V rail IC 1mm GPU Inductor 4mm GPU Rail IC 1mm Basically all IC 1mm, big inductor 4mm, small inductor 2mm. Here is the pads thickness I used. I noticed the whole heatsink was bent, because the work, I bent it back. It can be seen the paste is not evenly distributed. I used some old screws with spring on 2 place and one without it. Here is the final work. After all the work I tested the system and I was really not happy with the results. It seemed all the heat up with the blower vaporized the gas from the heat pipes. The heat distribution just not worked well. There were a lot of thermal throttling at the test. On the thermal camera it can be seen the heat pipes are not working. I was really sad that I had work for nothing and wrecked the heatsink. However after a day and after a few days it seemed the heatsink started to work. I have no idea how does it possible.. If someone could explain me a the physics of this it would be great. The result are here it seems to be a bit low score. With automatic fan control the average 73 C. With full fan the avarage 60 C. During whole test the power limit is on.

On second thought AUTO setting does not matter it just adjust which one test first.

If you sure that you have the latest BIOS for the iGPU even that I think rewriting the latest BIOS with the programmer is a good step. If you have an older BIOS then I assume the iGPU will not work. The programmer itself cheap comparing to any hardware and it is pretty easy to use. You already suspecting the motherboard faulty there is nothing to lose to try. If the default setting for iGPU is auto and you remove the GPU then the system should post with iGPU. ( I think) Need someone to confirm the teory since I do not have x170. What is the latest BIOS? Is iGPU setting is AUTO on default?

This is what I found, If you have the latest BIOS you have iGPU setting. I have P870 it does not have iGPU. Also you could try flashing a BIOS If you have CH341A programmer.

Hi, I think x170 does not have iGPU just like P870. It is more likely based on the sympthons that the GPU is faulty. Because the fan speed change and keyboard lit, it seems the EC should work. For the BIOS/EC work the CPU should be working. I am no expert either but I would test the GPU first.