Can I put laptop motherboard and cpu in to a ATX case?
If you laptop MB has a wifi card, it should be mounted on a mini-pcie connector, meaning it could be possible to replace the wifi card by a full pcie x1 deported riser (allowing desktop GPU card). This kind of riser must be powered by a desktop PSU and comes with a kit to power it on and off, meaning you could also use the power of the psu to powered some extra devices (fan, 3'5 hdd etc etc).
you should also have a look to your cpu to define if it could be upgraded or not, in my case, i upgraded a core2duo t5750 to a T9300 and really see a difference for a 12euros investment.
the CPU/GPU fan of the laptop was dead, so i removed the fan and the heatsink heatpipe couple, i ordered a larger alu heatsink and a pack of copper square of different height (gpu and cpu didn't have the same height so i had to adjust with the small copper square). the alu was easy to drill and not complicated to thread according to present holes around the cpu and the gpu. I use some brace for keep the alu at the ideal space from the cpu/gpu and fill the required space with relevant cooper's square. when the matching composition is found with copper's square, thermal paste is added (on the chip, then put a cop square, then paste, then cop square and so on until the alu heatsink finally join the thermal paste).
I didn't finish yet, so i just drop a 12mm fan on the heatsink to ensure the pc didn't get too hot (for now, the mobo is attached to brace fixed horizontally on a wood board, i think to manage the board to be positioned vertically with a square hole inside so the heatsink will go cross it, allowing a balance. vertical position would also be better for heat dissipation. Right now, I'm almost always 10degres celcius less than with the original cooling system, without noise..
the fan i use is a pc case silent 12mm fan with a 3pin connector, so i cut one old an unused usb cable and soldered it with the relevant 3 pins (only 2 used, i used the pin connector that came the the fan on a 3pins to molex adapter). but of course, if you use a pcie adapter with a pus, you could put the 12mm fan on a molex and so get it work at his max perf. I still don't know what i will do with the battery (maybe open it, test modules and repack some in order to offer a small battery to the system).
Ignore the usb disk on the fan on pictures, it's a dying one and i'm fighting to copy it's data before it really stops for ever (and so use the fan to keep it cold).
BIOS has been updated to get the intel virtualisation platform offered by the t9300 activable https://www.bios-mods.com/forum/Thread-Fujitsu-Siemens-Amilo-Li2735-Phoenix-Bios
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