Question Wrong size on be quiet! Pure Power 12 M 850W?

[zraaviisen(ZVN)]

Hello!
I just bought a new RTX 4070ti and wanted to upgrade the PSU aswell.
The case I'm using is an older NZXT S340 black and the new PSU is a be quiet! Pure Power 12 M 850W.
My older PSU was an EVGA SuperNOVA 750 G2.

From what I can tell they both are ATX PS2 but when i installed the PSU today it was too small. I understand that there's mounts that changes the chassi from ATX PS2 to SFX but that wouldn't solve this issue right? I'm scratching my head trying to figure out what I did wrong in my research. Any help is appreciated!
Cheers,
ZVN

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[kira-faye]

That model is a standard size ATX PSU, so I don't know what to tell you... You shouldn't need any kind of adapter plate. Did you leave a mounting plate on the old PSU without realizing, maybe? That case uses a rectangular plate held on with 4 thumb screws to mount the PSU - if it's missing the resulting hole would be too big.

 

[stonecarver]

That case uses a rectangular plate held on with 4 thumb screws to mount the PSU