Skip to main content

OWC SSD Flash Storage UpgradesiMac G4 15" & 17" Early 2003

capacity icon

Up to 12x the capacity of the original drive

performance icon

Up to 41x faster than the original drive


Money Back Guarantee
Test drive your OWC SSD for 30 Days. If you're not satisfied send it back for a full refund


Quality You Can Trust
OWC SSDs are made to the highest quality standards, built for your Mac first


Free Install Videos
Step-by-step videos guide you through the entire installation process


Free Shipping
Free shipping on all OWC SSD orders

Icon Search How to find Model ID

Works with the following model IDs:

  • PowerMac4,2
  • PowerMac4,5

Find your Mac Model ID in OS X

Click here for a Bookmarkable Web Page handy for future reference and with more information too.

Find Model ID

SSD Flash Storage Options For Your Mac

Icon Pro

OWC Mercury Pro Legacy


OWC Neptune 6G


High performance for everyday tasks – up to 511MB/s


Backed by OWC’s 3-Year Limited Warranty.

Icon Speed

Engineered for Mac first. No extra software needed.

OWC Neptune 6G

Drive Only +Up to 2 x Drives Inside!

120GB $17.75 Learn More Buy Now
250GB $38.75 Learn More Buy Now
500GB $69.75 Learn More Buy Now

OWC Data Doubler

Add a second drive in your Mac


Quality & Performance You Can Trust

OWC SSDs are built to the highest quality standards, custom made for Mac first and rigorously lab tested for reliable performance long into the future.


Industry Leading Warranty & Support

All OWC SSDs are backed by exceptional warranties up to 5 years, as well as our expert customer support program.


30 Day Money Back Guarantee

Test drive your OWC SSD for 30 Days. If you are not completely satisfied, simply contact OWC Customer Service to request a full refund. No hassle, no restocking fees - that's the OWC Difference.