u/screwdriverfan

It still works. The left side looks chewed because it was difficult to open the mouse to clean and fix it.

My brother had a PSU in wardrobe that's been sitting there for years (he thinks it doesn't work anymore, but wants to test it on old pc). It's a semi-modular psu 850w LC power LC8850 Arkangel v2.2.

It's a semi-modular unit that comes with non-modular 20+4 pin motherboard cable and supposedly CPU cable (which is a 6+2 pin apparently?).

The 6 pins plug in just fine but the 2 don't match. Like, physically. The squared pins can't be plugged into rounded shaped pins. Images below.

https://imgur.com/2zH1357
https://imgur.com/f2CirGh
https://imgur.com/zO2jLJR

Motherboard in question is ASUS MSA99X EVO R2.0.

On the side of the cable is written PCI-E which confused me the most. Don't semi-modular power supplies come with a motherboard + cpu power already pre-attached? Why would it have motherboard and pcie (which is for gpu) cables instead? PC build guides have been telling me semi-modular power supplies come with motherboard+cpu power pre-attached, hence the confusion.

I'm going to assume the pre-attached cable is not for cpu power then. There's also this cable which I assume is supposed to be for cpu power then and the pigtail part (white ziptie) is that goes into the motherboard (since some motherboards use 8+4 power delivery system for cpus):
https://imgur.com/XJNZT6N

Is this correct then? The two red sockets marked PCIE are for gpu power then which are color coded with red and both end with 6+2 pins.
https://imgur.com/4NrP0fq
https://imgur.com/F7mguJ3

I'd love to refer to a manual but I tried searching and haven't found anything useful as there seemed to be 2.3 revision of the power supply and can't fine one for 2.2. The only thing I have is this little "diagram" that's also on power supply: https://imgur.com/xG0zArv