Is This AGI Turbojet DDR5-6400 Kit a Good Buy?

It should be fine as long as the modules are healthy and the seller is trustworthy. AGI is likely sourcing memory chips from one of the major manufacturers and selling the finished modules under its own brand. The important factors are the actual memory chips, how well the kit was binned, and whether it passes stability tests. CL36 at DDR5-6400 is a reasonable specification, though AM5 systems often have an easier time running around DDR5-6000 than 6400.

The unfamiliar branding alone doesn’t necessarily make it bad. A used kit pulled from a prebuilt could work perfectly, but you should confirm that returns are allowed in case it has an intermittent fault. A computer store may or may not test a single component, depending on its policy and whether you pay a diagnostic fee, so it’s best to ask first. If you buy it, test both sticks together with a memory-testing utility before relying on the system.