Crescendo G3 PB G3/333/512k - Sonnet (PowerBook1400)

The good news for PowerBook 1400 owners like me is that Sonnet Technologies' Crescendo/PB G3 upgrade cards can put a G3 processor inside the 1400. The bad news is, it's still a 1400 ... read more at Macworld

PowerForce G4/450MHz - PowerLogix (ZIF)

Easy to install; offers good performance boost ... read more at Macworld

Mach Speed MPe G4/500MHz - XLR8 (ZIF)

Excellent installation package, MP enabled; good software. ... read more at Macworld

Encore G4/500MHz - Sonnet Technologies (ZIF)

Relatively inexpensive; good documentation; robust firmware package. ... read more at Macworld

Mach Speed MPe G4/450MHz - XLR8 (ZIF)

Excellent installation package; MP enabled; good software. ... read more at Macworld

Mach Speed MPe G4/400MHz - XLR8 (ZIF)

Excellent installation package; MP enabled; good software; excellent value ... read more at Macworld

Encore G4/400MHz - Sonnet Technologies (ZIF)

Good documentation; flexible firmware package; excellent value. ... read more at Macworld

MACh Velocity MPe Dual G4/500/250/1MB - XLR8 (ZIF)

The XLR8 mach Velocity G4 MPe is a dual-processor G4 upgrade card designed for the beige Power Mac G3. This latest offering from XLR8 offers twin G4 processors running at either 400MHz, 450MHz or 500MHz ... read more at MacUser UK

MACh Carrier G4/450/225/1MB - XLR8 (PCI to ZIF)

Using Symantec's System Info to run some simple benchmark tests on the Power Mac 9600 showed that the 450MHz G4 card doubled the overall performance of the 9600 ... read more at MacUser UK

iMaxPowr G4/433 - Newer Technology (iMac)

Talk about giving your iMac a huge boost in power! The Newer Technology iMax-Powr G4 upgrade takes a stock iMac (without FireWire) and makes it run at G4 speed ... read more at MacAddict

Mach Speed G3z G3/500/250/1MB - XLR8 (ZIF)

There's very little real-world difference between these upgrades. Each of the four accelerators runs at 500MHz and carries a 1MB backside cache, so it's not surprising that they all yielded similar results. The Newer upgrade produced the best scores, with the PowerLogix and XLR8 cards close on its heels. The Sonnet accelerator consistently lagged behind the other three. All four significantly outperformed a 350MHz blue-and-white Power Mac G3. ... read more at Macworld

Maxpowr G3-G3/500/250/1MB - Newer Technology (ZIF)

There's very little real-world difference between these upgrades. Each of the four accelerators runs at 500MHz and carries a 1MB backside cache, so it's not surprising that they all yielded similar results. The Newer upgrade produced the best scores, with the PowerLogix and XLR8 cards close on its heels. The Sonnet accelerator consistently lagged behind the other three. All four significantly outperformed a 350MHz blue-and-white Power Mac G3. ... read more at Macworld

PowerForce G3/500/250/1MB - PowerLogix (ZIF)

There's very little real-world difference between these upgrades. Each of the four accelerators runs at 500MHz and carries a 1MB backside cache, so it's not surprising that they all yielded similar results. The Newer upgrade produced the best scores, with the PowerLogix and XLR8 cards close on its heels. The Sonnet accelerator consistently lagged behind the other three. All four significantly outperformed a 350MHz blue-and-white Power Mac G3. ... read more at Macworld

MaxPowr G4/400/200/1MB - Newer Tech. (ZIF)

The CPUs are a cinch to install; you just plug the card into the ZIF socket and add a system extension. Although there were early reports that blue-and-white G3 systems would not accept G4 upgrades, the extensions appear to solve any compatibility issues; we encountered no unusual system crashes or other anomalies after installing the CPU upgrades ... read more at Macworld

MACh Speed G4z G4/400/200/1MB - XLR8 (ZIF)

The CPUs are a cinch to install; you just plug the card into the ZIF socket and add a system extension. Although there were early reports that blue-and-white G3 systems would not accept G4 upgrades, the extensions appear to solve any compatibility issues; we encountered no unusual system crashes or other anomalies after installing the CPU upgrades ... read more at Macworld

iMaxPowr G3/466 (iMac) - Newer Tech

Newer Technology's iMAXpowr G3 466 is a 466 MHz PowerPC G3 processor upgrade for iMac computers, revisions A through D. These iMacs came with processor speeds from 233 MHz to 333 MHz ... read more at MacGamer

MAXpowr G4/400 (PCI) - Newer Technology

if you want to get speed that approaches that of a G4, you might instead consider one of the upgrades that use the PowerPC 7400 chip used in Apple's latest machines. Newer's MAXpowr G4 400 is just such an upgrade for the Power Mac 7500/8500/9500 series of machines and their derivatives ... read more at MacUser UK

MACh Carrier G4/400 (PCI to ZIF) - XLR8

With XLR8's G4 upgrade card installed, we managed to fool an old, by some standards defunct, Mac into thinking it was one of the fastest, most powerful personal computers in the world. The MACh Carrier G4 competes with and in some cases outperforms Apple's most recent Power Mac G3s ... read more at MacUser UK

MAXpowr G3 466MHz (PCI) - Newer Technology

The latest CPU upgrade card from Newer Technology is a 466MHz upgrade for machines which can be upgraded via a daughterboard slot on their motherboard. These machines include the Power Mac 7300, 7500, 7600, 8500, 9500, 8600, and 9600, and some clone machines from Umax and Power Computing ... read more at MacUser UK

ProG3 450MHz (Zif) - Formac

The Formac ProG3 is a CPU upgrade card for all Power Mac G3s. Like all processor upgrades of this kind, it's a ZIF (zero insertion force) card. The card we tested is rated at 450MHz and has 1Mb of backside cache running at a very fast 225MHz ... read more at MacUser UK

MACh Carrier Card (PCI to ZIF) - XLR8

The MACh Carrier G3 card from XLR8 is an upgrade card with a difference. It allows older, 604-based Power Macs to be fitted with the latest ZIF-based G3 upgrades ... read more at MacUser UK

Encore G3/500/250/1MB (ZIF) - Sonnet Technologies

There's very little real-world difference between these upgrades. Each of the four accelerators runs at 500MHz and carries a 1MB backside cache, so it's not surprising that they all yielded similar results. The Newer upgrade produced the best scores, with the PowerLogix and XLR8 cards close on its heels. The Sonnet accelerator consistently lagged behind the other three. All four significantly outperformed a 350MHz blue-and-white Power Mac G3 ... read more at Macworld

MACh Carrier G3/500/250/1MB (PCI to ZIF) - XLR8

This 500MHz version of XLR8's MACh Carrier G3 is, in terms of clock speed, the fastest PowerPC processor we've seen. But don't be fooled by the numbers ... read more at MacUser UK