RadiSys PL35Q - Processor, Memory, and Video

3
Processor
25
Processor
Q35 motherboards support Intel Celeron, Pentium Dual-Core, and Core 2 Duo processors in a
socketable LGA775 package.
For support of other processors, refer to the Procelerant Endura Q35 Supported Processors List
on the RadiSys Web site.
Voltage requirements
The power supply connects to a standalone 4-pin ATX +12V power connector on the
motherboard to provide power for the processor.
An onboard DC-to-DC voltage regulator generates the processor core voltages from the +12V
power supply, and core PLLs and processor I/O from the +5V power rail. Both the processor
voltage and the operating frequency are automatically adjusted by the motherboard to suit the
installed processor.
Thermal requirements
The Intel Celeron, Pentium Dual-Core, and Core 2 Duo processors support the THERMTRIP#
signal for catastrophic thermal protection. An external thermal monitor, Winbond Super IO
W83627DHG (www.winbond.com/), is also implemented to protect the processor and the
system against excessive temperature. If the external thermal monitor detects a catastrophic
processor temperature of 125ºC (maximum), or if the THERMATRIP# signal is asserted, the
voltage supply to the processor will be turned off within 500ms to prevent permanent silicon
damage due to thermal runaway of the processor.
The thermal monitor feature and the Thermal Control Circuit (TCC) will be enabled in the CPU
by the board BIOS. The CPU temperature can be read over the SMbus at any time.
See Tab le 20 on page 25 for the thermal design power (TDP) values for each processor type,
for which the junction temperature (Tj) specifications fall within 0ºC — 100ºC. The processor
must remain within the minimum and maximum junction temperature.
Table 20. Supported processors
Processor Branding Process CPU#
Clock
Speed
MHz
FSB MHz L2 Cache TDP
Number
of Cores
Core 2 Duo 45nm E4800 3.0 1333 3M 65W 2
Core 2 Duo 65nm E6400 2.13 1066 2M 65W 2
Core 2 Duo 65nm E4300 1.80 800 2M 65W 2
Pentium Dual-Core 65nm E2160 1.80 800 1M 65W 2
Celeron 65nm 440 2.0 800 512K 35W 1