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All power
supplies meet ATX Specification 2.03, ATX12V Specification
1.1, and AMD Athlon requirements. ATX12V is an extension
to ATX 2.03, adding features required by Intel Pentium 4
motherboards, among others. Specifically, ATX12V power supplies
add increased +12V output capability, a new 4 pin output
connector, and increased +5VSB current. ATX12V is downward
compatible with ATX.
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Intel's Server System Infrastructure (SSI) define a set
of specifications for commonly used server components such
as power supplies. SSI power supply types include EPS2U,
EPS1U, and EPS12V. The aim of SSI is to avoid proprietary
designs and standardize server infrastructure, lowering
costs and providing other benefits. View the SSI website
for more information.
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Micro ATX power supplies are an ATX varient
focusing on reduced size and cost. The Micro ATX specification
requires the same output voltages as ATX with the exception
of -5V, which is optional. For full ISA compatibility, -5V
needs to be generated on the motherboard if not provided
by the power unit. Most modern systems using only PCI do
not require -5V and no action is necessary.
Micro
ATX power supplies come in Two form factors, SFX and PS3,
with industry standards consolidating behind SFX only
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Micro ATX power supplies come in Two form factors, SFX and
PS3, with industry standards consolidating behind SFX only
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Flex power supplies are a sub class of Micro ATX designed
to provide flexibility in designing compact, embedded and
portable computing devices. As with Micro ATX, the Flex
ATX specification requires the same output voltages as ATX
with the exception of -5V, which is optional. For full ISA
compatibility, -5V needs to be generated on the motherboard
if not provided by the power unit. Most modern systems using
only PCI do not require -5V and no action is necessary.
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The increase in demand for smaller systems results in unique
system layout challenges. The Thin Form
Factor with 12 Volt connector (TFX12V) configuration has
been optimized for small and low profile microATX
and FlexATX system layouts. The long narrow profile of the
power supply fits easily into low profile systems. The fan
placement can be used to efficiently exhaust air from the
processor and core area of the motherboard, making possible
smaller, more efficient systems using common industry ingredients.
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1U RackMount
1U rackmount ATX power supplies. Note that the 1U form factor
specifies a maximum height of 40.6mm, length and width may
vary depending on the particular 1U rack enclosure.
2U
RackMount
2U rackmount ATX power supplies.
The 2U form factor specifies dimensions of 200L x 100W x
70H mm
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The new Compact Form Factor with 12-V Connector (CFX12V) is
designed to support the expected power requirements of the
Balanced Technology Extended (BTX) systems in the 10 –
15 L chassis size range. The power ratings have been defined
to meet the requirements of today’s and the next generation
of high performance Intel Pentium® 4 processor-based systems.
In addition the design guides support power requirements of
PCI-Express* and Serial ATA* devices.
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