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Product Overview:
PowerForce Dual G4 Series 100


Compatibility Listing

Performance Benchmarks

Product Manual

Warranty Info


Panther Compatible


"Most impressively, the test results for a Mac upgraded with the PowerLogix Dual 1GHz card are on a par with Apple's current Dual 1GHz Mac .... The PowerForce Dual G4 is a great way to give an aging PowerMac a new lease on life". MacUser, UK, January 2003

The PowerForce Dual G4 Series 100 processor card (and its cousin, the single processor version) is the most advanced, highest performance CPU card available for any PowerMac, and the only one of its kind for the PowerMac G4. (Click here to find out which model of PowerMac G4 you have.)

The PowerForce Dual G4 Series 100 has many "firsts" to its credit. It is still the first and only dual processor upgrade, and now it's the first to utilize the latest (7457) processor.

The PowerForce Dual G4 was designed along with the single processor version. In fact, they share the same circuit board. This kept design costs to a minimum. In addition, we kept cost low in other ways; for example, L3 cache.

The goal was to deliver performance on par with the latest Macs at the lowest cost, which is why we didn't blindly follow Apple with regards to L3 cache. The cards have SDR cache instead of the more expensive (but quite unnecessary) DDR cache. This meant the incremental cost could be devoted to a second processor instead, which provides much greater performance. (As shown in our recently published L3 Cache White Paper, DDR cache offers zero performance advantage over SDR cache.)

The White Paper also shows that a larger L3 cache is best (not necessarily the speed or the type) and the PowerForce Dual G4 models have twice as much L3 cache as Apple's Dual 867 and Dual 1GHz models.

Speaking of DDR cache, it has recently become common knowledge that the latest PowerMac G4 architecture, in spite of a faster bus and DDR SDRAM, performs no better than previous generation models when benchmarked with identical processors. ( This is also true when comparing the latest models to a PowerMac G4 upgraded with a PowerForce Dual G4. Installing a PowerForce Dual G4 card into an older PowerMac G4 gives equivalent CPU performance to the 2002 PowerMacs, for significantly less expense. This preserves the user's investment in existing equipment.

There are even more unique design features...

For example, the power supply. The power supply on Dual G4 Series 100 card can easily provide up to 100 watts...i.e., much more than typically needed, but the card was designed to support the needs of dual processors. It's the same power supply pioneered on the single processor PowerForce G4.

A typical Apple power supply runs at 250KHz, single phase. The PowerForce Dual G4 Series 100 has a three phase power supply that runs at 1.2MHz, five times faster than Apple's. This means it can react to the processor's varying power requirements much more quickly. It's the first three phase power supply ever used on a Mac processor card.

This means cleaner power, better transient response, lower heat, and more reliability... especially important with the PowerPC Apollo at those high speeds. The power supply is also very small and compact, low profile, with no huge inductors or other large components taking up space.

The cards will accept faster 7457 processors as they become available.


Check out the single processor reviews on and


These upgrades require MacOS 9.2.2*, MacOS X 10.2.8 or 10.3 Panther. Classic in OS X 10.2.8 and 10.3 is fully compatible. PowerLogix also includes a firmware update so the system properly recognizes the 7457 processor. This update is required (but is easily reversible.)

Some early PowerMac G4 'AGP' models have a chipset that is not compatible with dual processors. For these machines we recommend the single processor PowerForce G4. To determine if your AGP is dual compatible, visit this page.

One note of clarification: if your PowerMac G4 came from Apple as a dual processor machine, it has a single card with two processors on it. This dual CPU card is removed and the PowerForce G4 card replaces the Apple card and *both* CPUs .It is not possible to install two PowerForce G4 cards to replace the two processors in your machine; only one card is required.

*Note: The dual card operates in single CPU mode under MacOS 9.2.2. For full dual functionality OS X is required.

Feature List: PowerForce Dual G4 Series 100
  • Two PowerPC 7457s @ 1.2GHz or 1.3GHz (technical specs)
  • 512 of L2 cache @ 1.2GHz or 1.3GHz
  • 2MB of L3 cache
  • 100MHz bus operation
  • Bus ratio of 12:1 or 13:1 depending on clock speed
  • Compatible with the following:
    • PowerMac G4 AGP Graphics (only dual compatible models)
    • PowerMac G4 Gigabit Ethernet

Specifications subject to change without notice.



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