Clone Specs from Hell!


Power Computing

Power Computing RAM Types & Specifications

The information excerpted in this document is derived from Power Computing Corporation's Technical Database (aka PowerSource), now hosted on the web as a service to the Macintosh public by Jeff Keller's PowerWatch.

Memory form factor links below are to memory pages within the MacGurus website. Please utilize these links to check memory prices, confirm memory specifications, or order RAM.


Series &
Main Logic Board
Form
Factor
RAM
Speed
No.
Slots
Max
Memory
Max Bus
Speed
Power 100
Cold Fusion PPC 601
FPM SIMM 70ns 6 200MB 40MHz4
Power 120
Cold Fusion PPC 601
FPM SIMM 70ns 6 200MB 40MHz4
PowerWave 120
Tsunami PPC 604
FPM DIMM 70ns 8 512MB 50MHz5
PowerWave 132
Tsunami PPC 604
FPM DIMM 70ns 8 512MB 50MHz5
PowerWave 150
Tsunami PPC 604
FPM DIMM 70ns 8 512MB 50MHz5
PowerCurve 120
Catalyst1 PPC 601
FPM DIMM 70ns 4 256MB 50MHz5
PowerBase 180
Alchemy PPC 603e
EDO DIMM2 60ns 3 160MB 40MHz6
PowerBase 200
Alchemy PPC 603e
EDO DIMM2 60ns 3 160MB 40MHz6
PowerBase 240
Alchemy PPC 603e
EDO DIMM2 60ns 3 160MB 40MHz6
PowerCenter 120
Catalyst1 PPC 604
FPM DIMM 70ns 4 256MB 50MHz5
PowerCenter 132
Catalyst1 PPC 604
FPM DIMM 70ns 4 256MB 50MHz5
PowerCenter 150
Catalyst1 PPC 604
FPM DIMM 70ns 4 256MB 50MHz5
PowerCenter 166
Catalyst Plus3 PPC 604
FPM DIMM 60ns 4 256MB 60MHz5
PowerCenter 180
Catalyst Plus3 PPC 604
FPM DIMM 60ns 4 256MB 60MHz5
PowerCenter Pro (210/240)
Catalyst Plus3 PPC 604e
FPM DIMM 60ns 4 512MB 60MHz
PowerTower 166/180
Catalyst Plus3 PPC 604
FPM DIMM 60ns 4 256MB 60MHz5
PowerTower 180e
Catalyst Plus3 PPC 604e
FPM DIMM 60ns 4 256MB 60MHz7
PowerTower 200e
Catalyst Plus3 PPC 604e
FPM DIMM 60ns 4 256MB 60MHz7
PowerTower Pro 180
Tsunami PPC 604e
FPM DIMM 60ns 8 1024MB 50MHz7
PowerTower Pro 200
Tsunami PPC 604e
FPM DIMM 60ns 8 1024MB 50MHz7
PowerTower Pro 225
Tsunami PPC 604e
FPM DIMM 60ns 8 1024MB 45MHz7
PowerTower Pro 250
Tsunami PPC 604e
FPM DIMM 60ns 8 1024MB 45MHz7
1Note: Catalyst motherboards are certified at a maximum of 50MHz, although testing by PCC has demonstrated reliability up to 60MHz.

2Note: PowerBase requires Non-Parity, 2k refresh, buffered 5v EDO 168-pin DIMM with an access speed of 60ns. Power Computing technical documents stress that EDO DIMMs installed in Slot 1 (Bank 0) must be single-banked, and 32MB in density, or less, while EDO DIMMs installed in Slots 2 & 3 can be either single or double-banked in sizes up to 64MB.

3Note: Power Computing has modified and enhanced PowerTower and PowerCenter 166/180 MLBs (the so-called Catalyst Plus) to run at a maximum of 60MHz. Enhancements include ASICs and L2 cache certified reliable beyond 55.33MHz.

4Note: The PowerPC 601 used in the Power 100 supports clock multiples of 1:1, 2:1, 3:1, 4:1, 5:1, & 6:1. Since the max bus speed of the Power 100 is 40MHz, the fastest processor this motherboard could presumably support would theoretically run at 240MHz. In the real world, heat issues and ASIC limitations mitigate against this sort of clock-chipping, and MacGurus makes this data available for purposes of comparison only, not for implementation. Don't melt your logic board!

5Note: The PowerPC 604 used in the PowerWave-series supports clock multiples of 1:1, 1.5:1, 2:1, & 3:1. Since the max bus speed of the Tsunami-based PowerWave-series is 50MHz, the fastest PPC 604 processor this motherboard reliably supports runs at 150MHz, which happens to be the rated speed of the fastest machine in the series. The Catalyst Plus-based PowerCenter 166 & 180, along with the PowerTower-series, on the other hand, all acommodate processor speeds up to 180MHz due to their faster 60MHz system bus.

6Note: The PowerPC 603e used in the PowerBase-series supports clock multiples of 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, 5.5:1, & 6:1. Since the max bus speed of the PowerBase-series is 40MHz, the fastest 603e processor this motherboard reliably supports runs at 240MHz, which also happens to be the rated speed of the fastest machine in the series.

7Note: The PowerPC 604e used in the PowerTower 180e, 200e & PowerTower Pro-series supports clock multiples of 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 5:1, & 6:1. Since the max bus speed of the PowerTower-series is 60MHz, the fastest 604e processor this motherboard could theoretically support would run at 360MHz. Since the Tsunami-based PowerTower Pro-series has a comparatively sedate max bus speed of 50MHz, the fastest PPC 604e processor its motherboard could theoretically support would run at a mere 300MHz. MacGurus wishes to thank its esteemed correspondent DXTR for his kind corrections to our PowerTower Pro 225 specs. MacGurus would also like to emphasize that while Tsunami MLBs have been clocked at bus speeds beyond 60MHz, they were not, in fact, designed or engineered to run at bus speeds beyond 50MHz. Our own reliability testing leads us to highly recommend that no Tsunami MLB be pushed beyond 50MHz. MacGurus appreciates the time-saving assistance of Steve Hyman in this matter.

Interestingly, Power Computing has compensated for the slower bus speed of the Tsunami-based PowerTower Pro MLB by exploiting a large, fast L2 cache (1MB), and Tsunami's characteristic interleaved memory. Although the Catalyst-based PowerTower-series runs at a much snappier bus speed of 60MHz, its memory controller does not support memory interleaving, and this, in combination with its smaller L2 cache, yields overall MacBench processor scores equivalent to those clocked by the PowerTower Pro-series.

At the risk of overstating the obvious, only Tsunami-variants among the Power Computing product line utilize the HammerHead IC memory controller which enables memory interleaving. All other PCC MLB's lack this feature.

We appreciate your technical corrections and comments !




To Motherboards Directory