I unfortunately have the exact kit of ram you mentioned to avoid, it came with the Microcenter bundle.
I live ~2.5 hours from Microcenter, so I took a gamble-- reviews were very mixed but the price was insane. If I had bought this setup from my local BestBuy or online, I'd have returned it.
What's your plan if you can get that 256GB RAM config? Run some full-fat LLM's on your iGPU?