Mobile Sempron SI-42 vs Core 2 Quad Q9400

Place in the ranking	2256	3219
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Laptop
Series	no data	AMD Mobile Sempron
Power efficiency	1.34	0.79
Architecture codename	Yorkfield (2007−2009)	Sable (2008−2009)
Release date	August 2008 (16 years ago)	1 September 2009 (15 years ago)

Detailed specifications

Core 2 Quad Q9400 and Mobile Sempron SI-42 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)	1 (Single-Core)
Threads	4	1
Base clock speed	2.66 GHz	no data
Boost clock speed	2.67 GHz	2.1 GHz
Bus rate	1333 MHz	1800 MHz
L1 cache	64K (per core)	128 KB
L2 cache	6 MB (shared)	512 KB
L3 cache	0 KB	no data
Chip lithography	45 nm	65 nm
Die size	2x 81 mm²	no data
Maximum core temperature	no data	100 °C
Maximum case temperature (TCase)	71 °C	no data
Number of transistors	456 million	no data
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	0.85V-1.3625V	no data

Compatibility

Information on Core 2 Quad Q9400 and Mobile Sempron SI-42 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	1	no data
Socket	LGA775	S1g2
Power consumption (TDP)	95 Watt	25 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Quad Q9400 and Mobile Sempron SI-42. You'll probably need this information if you require some particular technology.

Instruction set extensions	no data	65 nm, 1.075 - 1.125
Enhanced SpeedStep (EIST)	+	no data
Turbo Boost Technology	-	no data
Hyper-Threading Technology	-	no data
Idle States	+	no data
Thermal Monitoring	+	-
Demand Based Switching	-	no data
FSB parity	-	no data

Security technologies

Core 2 Quad Q9400 and Mobile Sempron SI-42 technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	no data
EDB	+	no data

Virtualization technologies

Virtual machine speed-up technologies supported by Core 2 Quad Q9400 and Mobile Sempron SI-42 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core 2 Quad Q9400 and Mobile Sempron SI-42. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

no data

Gaming performance

Pros & cons summary

Performance score	1.35	0.21
Physical cores	4	1
Threads	4	1
Chip lithography	45 nm	65 nm
Power consumption (TDP)	95 Watt	25 Watt

Core 2 Quad Q9400 has a 542.9% higher aggregate performance score, 300% more physical cores and 300% more threads, and a 44.4% more advanced lithography process.

Mobile Sempron SI-42, on the other hand, has 280% lower power consumption.

The Core 2 Quad Q9400 is our recommended choice as it beats the Mobile Sempron SI-42 in performance tests.

Note that Core 2 Quad Q9400 is a desktop processor while Mobile Sempron SI-42 is a notebook one.

Should you still have questions on choice between Core 2 Quad Q9400 and Mobile Sempron SI-42, ask them in Comments section, and we shall answer.