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Power Miser PCs Save $$
September '93
submitted by: Gloria Short
Brain Storm Learning 713-550-8105
Power Miser PCs Save $$$
Reduce, reuse, recycle. Those three words will reshape the desktop
as PCs go "green." The first step is here: energy-efficient PCs.
The next generation of energy-efficient desktop computers is here
and promises to save you money by cutting your utility bills
without sacrificing performance. These machines, which in sleeplike
mode use an eighth the power of traditional desktops, also herald
an age of environment-friendly computers that are recyclable and
produced with fewer pollutants.
Our evaluation of three of the first energy-efficient PCs to reach
the market- AST Research's Bravo LP 486/66dx, Austin Computer
Systems' Green PC 486/66, and IBM's PS/2 E-uncovered a wide range
of power conservation features and other innovations. All three
power down after a period of inactivity to a notebooklike sleep
mode from which they can be awakened with the touch of a key or a
mouse movement.
Of the models we tested, Austin's Green PC 486/66 was the clear
winner. It offers a sleep mode that draws just 28 watts (system
with monitor) and traditional PC pricing- the DX2-66 version starts
at $2299. IBM's PS/2 E won high marks for technical innovation and
draws just 29 watts in sleep mode, but its high price and limited
expandability place the unit in a league of its own. For moderate
energy savings and a low estimated street price of under $2700,
AST's Bravo LP 486/66dx is a solid choice. It provides a sleep mode
of 55 watts.
To have their products included in this test drive, vendors
submitted computers they said qualified for the Environmental
Protection Agency's Energy Star Computers program, which requires
computers, monitors, and printers to consume a maximum of 30 watts
of electricity in an idle state (45 watts for printers faster than
15 pages per minute and all color printers). But there is no
monitoring program in place to ensure EPA compliance, and our
findings indicate that energy consumption- and your savings-will
vary greatly from vendor to vendor.
Our advice: Look further than the Energy Star logo to find the most
efficient product. Ask vendors for information on how they achieve
energy reductions, such as whether they use software modes,
low-voltage components, and energy-efficient monitors. And be
aware: Each add-in card you install, every peripheral you connect,
every bay you fill- even upgrading to a larger hard drive or adding
cache memory- will cause your system to use more power. How much
power it uses also depends on what you run. For example, the more
screen activity, the more power required, so Windows will generally
cost you more to run than DOS.
The IBM PS/2 E has the most innovative design of any desktop we've
seen in a while. For power management, the PS/2 E employs a number
of mobile computing technologies- and likewise suffers from some of
the common inconveniences of notebooks, such as limited
expandability and a high price. In our tests, a PS/2 E system
configured with a maximum 16MB of RAM (8MB is standard) and an LCD
monitor drew about 46 watts at the DOS prompt and 47 watts while
running Excel. In sleep mode, the combo drew 29 watts.
The power savings start with the CPU, a clock doubler IBM 486SLC2
with a 3.3-volt design that uses about half the power of
traditional 5-volt CPUs and runs at 50 MHz in a 25-MHz system. IBM
claims the system performs about as fast as a 33-MHz 486. The
company shaved off another couple of watts by using a 21/2-inch
120MB hard drive, a notebook-size device that draws about 2 watts-
half the draw of a comparable 31/2-inch drive. IBM opted against
standard expansion slots in favor of four PCMCIA slots. You can hot
swap PCMCIA cards simply by slipping them into the slot as you
would a floppy, which makes them a lot easier to install than
typical AT add-in cards. Unfortunately, PCMCIA cards cost a lot
more than AT cards, and you won't find as many options- yet. The
four PCMCIA expansion slots draw a maximum of 2 watts per device,
or about 25 percent of the power used by standard ISA devices,
according to IBM.
The IBM's optional 9-pound monitor is actually a 10.4-inch LCD
notebook screen incorporated into a desktop stand. While limited to
16 colors and 640 by 480 graphics, it has two low-power states. The
first keeps it ready for quick power-up; the second is a sleep
mode. The monitor never draws more than 30 watts and in PC World
tests drew 30 watts at the DOS prompt, 21 watts in the first ready
state, and 16 watts in sleep mode.
The PS/2 E also deserves kudos for achieving lows in three other
areas: noise (there's no fan), monitor emissions (the optional LCD
monitor is virtually emissionless), and desktop footprint (the
system unit measures 12 inches square, plus it's only 2.75 inches
high). One low the product doesn't offer is price: The 8MB system
with a 120MB hard drive, the VGA LCD monitor, and a floppy drive
costs $6780.
For the more price conscious, IBM offers a 14-inch CRT option that
powers down to 8 watts. The system with this 1024 by 768 monitor,
8MB of RAM, a 120MB hard drive, and a floppy drive costs $3385.
Don't look for the PS/2 E in a retail outlet; IBM is limiting
availability to special bid orders.
AST's Basic Philosophy
While IBM flexed its technical muscle, AST drew on its notebook
technology to transform its entry-level Bravo line with a
redesigned keyboard controller and a new BIOS. The resulting Bravo
LP line consists of three processors- 486SX-25, 486DX-33, and
486DX2-66- in two basic configurations: 170MB with 4MB of RAM, and
340MB with 8MB of RAM. All of them are expandable to 64MB of RAM
and offer local bus video, and you can upgrade to OverDrive for
DX2.
The keyboard controller, similar to those used in AST's notebooks
for power management, lets the Bravo LPs communicate with a new
family of low-emission monitors via a vacant pin in the video
connector. After a user-defined period of keyboard inactivity, the
controller signals the monitor to go to sleep. The monitors will
also be sold separately. While the Bravo LP systems are able to use
any monitor, the sleep signal works only with monitors equipped to
receive it. AST also reached into its bag of mobile computing
tricks to implement a hard drive power-down state that's user
definable in setup.
A relatively austere prototype configuration- the Bravo LP 486/66dx
with a single floppy drive, 8MB of RAM, a 170MB hard disk, and an
energy- efficient 15-inch monitor- pulled 55 watts in sleep mode.
With Windows idle, the unit- including monitor- pulled 100 watts.
This 486DX2-66 unit will have a street price under $2700.
The 486SX-25 Bravo LP 425s with a 170MB hard drive, 4MB of RAM, 1MB
of video DRAM, and the 15-inch, flat-screen, low-emission monitor
sells for about $1600 ($1200 without the monitor). That's $100 to
$200 more than similar Bravo PCs, but, company officials note, the
system includes local bus graphics, a larger hard drive, and a
larger monitor.
Austin's Optimum Innovation
For price and performance, the unit we preferred was Austin's
thoughtfully designed Green PC 486/66. Even with a 14-inch monitor,
16MB of RAM, a 340MB hard drive, a tape drive, and two floppy
drives, it had a sleep mode of just 28 watts in our tests- less
than half the EPA ceiling. The prototype we tested drew 79 watts at
the DOS prompt and 31 watts with the monitor off and the hard drive
spinning. The tested configuration sells for $3199.
In addition to turning off the monitor, Austin's Green PCs can shut
down the hard drive after a user-configurable period of time,
putting the unit in its 28-watt sleep mode. Or the system can leave
the monitor off while performing some activity, such as backup, at
night after you've gone home. Power management is activated after
a user-configurable period of time or via a button on the front of
the PC. To reduce noise pollution and energy use, the fan varies
its speed according to the operating temperature. The company plans
to offer a low-radiation monitor.
The Green PC 486/66 is the high end of Austin's new Green PC line
of 15 systems; the low end is a 486SX-25 model with 4MB of RAM
expandable to 32MB and a 170MB hard drive for $1499. The basic
Austin Green PC 486/66 with 4MB of RAM, a 340MB hard drive, and a
14-inch monitor is $2299. All the systems offer several
configurable power management options and solid Energy Star
benchmarks, and they include a low-emission, 14-inch super-VGA
monitor, local bus graphics, and an IDE hard drive adapter.
How does the power consumption of these PCs compare with that of
traditional computers and business equipment? A Texas Instruments
DX2-50 notebook, fine-tuned for power management, hovered around 21
watts for every task except an animated sequence in Microsoft Golf
that pulled 27 watts. A 66-MHz 486DX2 from CompuAdd's new
high-performance Centura line with a 500MB hard drive and Diamond's
Viper local bus video card drew 95.6 watts at the DOS prompt. A
Hewlett-Packard DeskJet 550C drew 7 watts while idle and around 11
watts while printing. The new Energy Star LaserJet 4L draws 180
watts while printing and powers down to 10 watts when idle,
according to HP.
There's More to Being Green
Cutting energy use is all well and good, but it's only a start in
creating truly "green" computers. Recyclability is also important,
and some vendors are already addressing the issue. Many of the
parts in the IBM PS/2 E are easily recycled, and 25 percent of the
plastic used in the unit is recycled plastic. Apple and TI were the
first companies to accept laptop batteries for disposal. You can
get advice on where to drop off your computer's packaging for
recycling by calling 800/944- 8448.
Industry watchers predict that within a year, energy-saving
features will be built into nearly every computer, monitor, and
printer sold. Once all computer equipment is energy efficient,
computer power use should drop by as much as 75 percent. Computers
currently account for about 5 percent of total U.S. power use,
according to EPA estimates. What does that mean in dollars and
cents? According to the EPA, if energy-saving computers and
monitors are left on 24 hours a day, you could save as much as $120
a year per system, or $600,000 for a corporation with 5000 PCs.
Makes you think: Is your PC on now?
AST Bravo LP 486/66dx
The top system in an extension of the Bravo line.
Key Features: Energy-efficient monitor Upgradable to OverDrive for
DX2 Power-down hard drive
Pricing: Under $2700 Availability: Immediate
AST Research Inc., 800/876-4278, 714/727-4141
Austin Green PC 486/66 Power management features at the same price
as traditional PCs.
Key Features: Multiple power management settings Local bus IDE and
graphics
Pricing: $3199 Availability: Immediate
Austin Computer Systems, 800/752-1577, 512/339-3500
IBM PS/2 E A radical design wraps notebook technology in desktop
form.
Key Features: No-fan, noiseless operation Four PCMCIA slots
Pricing: With LCD monitor $6780, with 14-inch CRT monitor $3385
Availability: Immediate
IBM Personal Computer Co., 800/772-2227