Core 2 Quad Q9400s vs Xeon X5550

Primary details

Comparing Xeon X5550 and Core 2 Quad Q9400s processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	1961	not rated
Place by popularity	not in top-100	not in top-100
Cost-effectiveness evaluation	0.32	no data
Market segment	Server	Desktop processor
Power efficiency	1.90	no data
Architecture codename	Gainestown (2009−2010)	Yorkfield (2007−2009)
Release date	30 March 2009 (15 years ago)	18 January 2009 (15 years ago)
Launch price (MSRP)	$62	no data

Cost-effectiveness evaluation

Performance per price, higher is better.

Detailed specifications

Xeon X5550 and Core 2 Quad Q9400s basic parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters indirectly say of CPU speed, though for more precise assessment you have to consider their test results.

Physical cores	4 (Quad-Core)	4 (Quad-Core)
Threads	8	4
Base clock speed	2.66 GHz	2.66 GHz
Boost clock speed	3.06 GHz	0.67 GHz
Bus rate	no data	1333 MHz
L1 cache	64 KB (per core)	64 KB (per core)
L2 cache	256 KB (per core)	6 MB (shared)
L3 cache	8 MB (shared)	0 KB
Chip lithography	45 nm	45 nm
Die size	263 mm2	2x 82 mm2
Maximum core temperature	75 °C	no data
Maximum case temperature (TCase)	no data	76 °C
Number of transistors	731 million	456 million
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	no data	0.85V-1.3625V

Compatibility

Information on Xeon X5550 and Core 2 Quad Q9400s compatibility with other computer components: motherboard (look for socket type), power supply unit (look for power consumption) etc. Useful when planning a future computer configuration or upgrading an existing one. Note that power consumption of some processors can well exceed their nominal TDP, even without overclocking. Some can even double their declared thermals given that the motherboard allows to tune the CPU power parameters.

Number of CPUs in a configuration	2	1
Socket	FCLGA1366,PLGA1366	LGA775
Power consumption (TDP)	95 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Xeon X5550 and Core 2 Quad Q9400s. You'll probably need this information if you require some particular technology.

Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	1.0	-
Hyper-Threading Technology	+	-
Idle States	+	+
Thermal Monitoring	-	+
Demand Based Switching	+	-
PAE	40 Bit	no data
FSB parity	no data	-

Security technologies

Xeon X5550 and Core 2 Quad Q9400s technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	+
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Xeon X5550 and Core 2 Quad Q9400s are enumerated here.

VT-d	+	+
VT-x	+	+
EPT	+	no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Xeon X5550 and Core 2 Quad Q9400s. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types	DDR3	DDR1, DDR2, DDR3
Maximum memory size	144 GB	no data
Max memory channels	3	no data
Maximum memory bandwidth	32 GB/s	no data
ECC memory support	+	-

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

N/A

On certain motherboards (Chipset feature)

Peripherals

Specifications and connection of peripherals supported by Xeon X5550 and Core 2 Quad Q9400s.

PCIe version

2.0

2.0

Pros & cons summary

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Recency	30 March 2009	18 January 2009
Threads	8	4
Power consumption (TDP)	95 Watt	65 Watt

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Should you still have questions on choice between Xeon X5550 and Core 2 Quad Q9400s, ask them in Comments section, and we shall answer.

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