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7 guaranteed-fit options
System at a glance
Guaranteed-fit promise
Every kit is matched to your machine's slots and checked against its published specs before we list it.
DDR · DIMM · up to 266 MT/s · ECC supported · Registered
4×256MB = 1GB
Verified fit for your systemNot stocked right now. It's verified to fit — get an email the moment it's back.
Every option here is verified to fit this system. Muted means it fits too — we just don't stock it right now. Pick one to switch.
Software for your upgrade — matched to your IBM IntelliStation Z Pro 6221-xxx.
Checks the drivers on your IBM IntelliStation Z Pro 6221-xxx, installs the safe updates Windows offers, guides the rest to the official download — and confirms exactly which of the upgrades above your machine has room for.
IBM IntelliStation Z Pro 6221-xxx takes DDR DIMM/RDIMM memory, 4 slots, up to 8 GB. Every option above matches those requirements, so it typically installs and runs without any firmware change.
“Spec match” means the module matches your system’s published specifications; it isn’t yet confirmed against a manufacturer tool.
Specifications reported for the IBM IntelliStation Z Pro 6221-xxx.
Good to know
System notes
We've already verified which memory and storage upgrades fit this exact machine — they're just not in stock at the moment. Leave your email and we'll tell you the moment any of them is available again. Guaranteed fit, no wrong parts.