XLR8 today announced a dual-550MHz G4 upgrade for Graphite Power Mac G4 systems. To take advantage of the upgrade, customers send their current single- or dual-processor G4 card to XLR8, which then upgrades the card’s processors and tests the performance. The upgrade costs US$429.00. XLR8 also offers an “Advance Ship Option” whereby the company sends the user a 550MHz G4 processor card to use while the upgrade is being performed. The customer then sends the loaner card back to XLR8 when they receive their dual-550MHz upgrade.