Crucial CT4G3S1339M

Overview

The Crucial CT4G3S1339M is a 4 GB DDR3L memory module designed to upgrade compatible Mac systems, including iMac, Mac mini, MacBook, and MacBook Pro models. Running at 1333 MHz with CL9 latency, it enhances multitasking and speeds up demanding tasks like photo editing and video trimming. Its dual-voltage support at 1.35 V and 1.5 V helps maintain energy efficiency and system stability.

Key features

• 4 GB capacity that provides additional memory for smoother multitasking and faster application performance
• DDR3L technology operating at 1333 MHz to balance speed and power consumption effectively
• CL9 CAS latency ensures quick data access, reducing delays during intensive workflows
• Dual-voltage compatibility supports both 1.35 V and 1.5 V operation, allowing use in a wider range of Mac models while keeping power usage low
• 204-pin SO-DIMM form factor tailored for Mac laptops and desktops, ensuring a proper fit and reliable connection
• Easy installation process that requires only basic tools, making it accessible for users upgrading their own machines

Key specs

• Memory type: DDR3L SO-DIMM
• Capacity: 4 GB
• Speed: 1333 MHz
• CAS latency: CL9
• Voltage: 1.35 V / 1.5 V dual-voltage support
• Pin count: 204 pins

Compatibility and usage

This memory module is compatible with select Mac models that use 204-pin SO-DIMM slots, including various iMac, Mac mini, MacBook, and MacBook Pro versions. It is well suited for users who want to extend the life of their existing Mac hardware by improving responsiveness and handling larger files or multiple applications more efficiently. Whether you are a student, creative professional, or home user, this upgrade can make everyday computing tasks feel noticeably faster.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

Deliveries are handled by major carriers such as USPS, UPS, and FedEx. Estimated delivery times are displayed at checkout and may vary depending on service level and location. Please note that these are estimates and can be affected by weather, holidays, or carrier volume. Once your order ships, you’ll receive a tracking number for real-time updates from pickup to final delivery.

Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

Learn more

Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, and include all tags, manuals, accessories, and original, unaltered packaging. To start a return, please email us for approval. Items sent back without approval may be refused or returned to the sender. If any item is kept, its value will be deducted from the refund.

Non-returnable items include opened TVs, combos, or monitors 37″ or larger, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method. Please allow 5–7 business days for the credit to post. Shipping and handling are nonrefundable. If an item is used, incomplete, or not in its original condition, a 30% restocking fee may apply. Direct exchanges are not offered. To exchange an item, please purchase the replacement separately and return the original for a refund.

Learn more

We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

Learn more