Yup, I totally get it. I had to tinker with power cables (the EVGA RTX 3090 required 3 x 8 pin power connectors). Also, cooling - I couldn’t get my hands on a blower-style RTX card, so the GPU just dumps its heat inside the chassis.

I also bought cheap “eBay memory” instead of the more expensive Lenovo offering and had to reseat DIMMs a few times to stop having ECC errors (the memory scrubbing feature is nice).