FWIW - 76-77C is the normal running temp for the northbridge in a dual processor machine in Australia, if you have an upgraded GPU, multiple drives, ethernet, wifi, bluetooth etc all connected up and running,
If you don't want to use pushpins for the heat sink, Jaycar (for folks outside .au, an electronics component seller) sells nylon nuts, washers & bolts that fit without drilling.
Thanks, I'll check Jaycar, and the advise on the length given here. Thanks guys.
As far as my setup goes, I am still using 85 watt I think 4 thread slow CPUs ... I have high watt coming. I've several drives, just one small SSD run a CD space.
A thing about digital drives (SSD/NVME) versus Winchester drives - the digital drives use less power. But IMO, the digital drives produce much more heat. I guess the spinning motor use energy for mechanical operations, but IMO they run much cooler than do digital.
I'll likely now put in metal GPU which will increase heat.
I really should put in an extra fan and a silent one, while I am at it.
So, it's time to do some maintenance. A proper very careful clean must be a good idea. I don't have an anti static setup though. Funny thing is that people advise earthing anti-static matts and wrist wires to hydronic heaters - but my house's hydronic heaters are connected with plastic hot water pipes rather than the traditional copper pipes! And where I'd do the cleaning, the floors heat the house! Sometimes one has to be careful of the advise one learns on Youtube!
The Northbridge and the CPUs, and the motherboard, deserve maintenance after so much time.