Compatible System: Dell: OptiPlex GX520 Small Form Factor/Desktop/Mini-Tower Features: OEM Part#: A0535239 Top grade chips and components – Each Axiom memory module is manufactured to meet or exceed OEM specifications. Fully tested – All memory chips that leave our warehouse are fully tested to guarantee quality and reliability. Guaranteed compatibility – Axiom guarantees that each system specific chip will work with its corresponding OEM computer. Lifetime warranty – Once you purchase an Axiom memory chip, you never need to worry about failure because all Axiom memory modules come with a lifetime warranty. Parts: Lifetime limited Labor: Lifetime limited