Need advice on a server build
So I have a Dell T320 case where the motherboard no longer works. My friend was incredibly kind to give me his old server build with a Supermicro X9SRA-3 but that came with new problems and I'm trying to find the best route from here.
I know the front panel connector and the back panel didn't work because they have some connectors that don't match on this new mobo, but I got that taken care of.
My next problem is the PSU. I have this [750w Server PSU from Dell](https://dsegunda.pe/storage/products/60677c3404e886c218f5c138523084e51b461fd5-1.jpg) with this [Power Distribution Board](https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Ftse1.mm.bing.net%2Fth%2Fid%2FOIP.a6Ze49IYY9Y6kpJUEjMIswHaG8%3Fpid%3DApi&f=1&ipt=b7489f60cfd1e72047414a2fc7ef1faf25ef06b1c75c99296580208e49b13891&ipo=images). I noticed the server will not boot if all of the connectors are not plugged in to a mobo.
I wanna know if it would be ok to use [something like this](https://www.ebay.com/itm/257588698104) as an alternative and if it is, will it be useful in plugging in the 24 pin for the mobo (which I do see this one is), the CPU, power for SATA, etc.
I know the CPU is a 4+4 pin, which I'm wondering if it would be safe to plug in that board with only 6 pins on there as well as the GPU, which I need 8 pins for this one.
Is this a good idea? Or should I scrap that and use a traditional ATX PSU like [this one](https://i.ebayimg.com/images/g/OQQAAeSwIVVqOmK4/s-l500.jpg) and find a way to make it fit inside the case, plugging in the cables I need? I'll be using a SFX PSU so it's smaller.
I mainly wanted to keep the server PSU since it fits in there nicely, it's 750w and it is platinum rated but I'm not opposed to the alternative.