Replaced PSU, now pc is much slower.

[WyattB]

I don’t have anyone I can borrow a fan from. Tried changing to the old PSU, but it was even worse now. So the new psu must have done something bad.

[phillpower2]

As said the Corsair is multiple times better than the AcBel so swapping that in has not done any harm.

Can you tell us what the actual problem is, is it slow all round performance or just video.

If the chipset is overheating that will throttle and slow down the whole system and if you don`t do something about it something will fail completely pretty soon.

[WyattB]

It has slowed down all around, opening programs as well as lagging games.
Nothing emits heat inside the case, and the problems started along with the psu replacement, so it must be connected somehow.

[phillpower2]

That behaviour is typical of something overheating and running out of free storage space on the storage space where Windows is installed, both problems that can be seen in your Speccy report.

Nothing emits heat inside the case,

Do you happen to know what the chipset does and where it can be found on the MB.

The chipset is what enables the MB to be able to communicate with all the other hardware and because it is shown to be overheating it would explain the slow performance you are getting, the chipset on your particular MB is called the Southbridge and you can check it`s temp in Speccy.

[phillpower2]

Thread closed due to lack of feedback from the OP.