Core 2 Duo E6540 vs Core 2 Duo T9400

Place in performance ranking	2732	2837
Place by popularity	not in top-100	not in top-100
Market segment	Laptop	Desktop processor
Series	Intel Core 2 Duo	no data
Architecture codename	Penryn (2008−2011)	no data
Release date	15 July 2008 (16 years ago)	1 July 2007 (17 years ago)
Launch price (MSRP)	$316	no data

Detailed specifications

Core 2 Duo T9400 and Core 2 Duo E6540 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	2 (Dual-core)	2 (Dual-core)
Threads	2	no data
Base clock speed	2.53 GHz	2.33 GHz
Boost clock speed	2.53 GHz	no data
Bus rate	1066 MHz	1333 MHz
L1 cache	128 KB	no data
L2 cache	6 MB	no data
L3 cache	6 MB L2 Cache	4 MB L2 Cache
Chip lithography	45 nm	65 nm
Die size	107 mm²	no data
Maximum core temperature	105 °C	72 °C
Number of transistors	410 Million	no data
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	1.05V-1.162V	0.85V-1.5V

Compatibility

Information on Core 2 Duo T9400 and Core 2 Duo E6540 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.

Socket	BGA479,BGA956,PBGA479,PGA478	PLGA775
Power consumption (TDP)	35 Watt	65 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Duo T9400 and Core 2 Duo E6540. You'll probably need this information if you require some particular technology.

Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	-	-
Hyper-Threading Technology	-	-
Idle States	-	+
Thermal Monitoring	-	+
Demand Based Switching	-	-
FSB parity	-	-
Status	Discontinued	Discontinued

Security technologies

Core 2 Duo T9400 and Core 2 Duo E6540 technologies aimed at improving security, for example, by protecting against hacks.

TXT	+	-
EDB	+	+

Virtualization technologies

Virtual machine speed-up technologies supported by Core 2 Duo T9400 and Core 2 Duo E6540 are enumerated here.

VT-x

Synthetic benchmark performance

Various benchmark results of the processors in comparison. Overall score is measured in points in 0-100 range, higher is better.

Combined synthetic benchmark score

This is our combined benchmark performance rating. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.

Core 2 Duo T9400 0.65
+25%

Core 2 Duo E6540 0.52

Passmark

Passmark CPU Mark is a widespread benchmark, consisting of 8 different types of workload, including integer and floating point math, extended instructions, compression, encryption and physics calculation. There is also one separate single-threaded scenario measuring single-core performance.

Core 2 Duo T9400 1006
+24.5%

Core 2 Duo E6540 808

Gaming performance

Pros & cons summary

Performance score	0.65	0.52
Recency	15 July 2008	1 July 2007
Chip lithography	45 nm	65 nm
Power consumption (TDP)	35 Watt	65 Watt

Core 2 Duo T9400 has a 25% higher aggregate performance score, an age advantage of 1 year, a 44.4% more advanced lithography process, and 85.7% lower power consumption.

The Core 2 Duo T9400 is our recommended choice as it beats the Core 2 Duo E6540 in performance tests.

Be aware that Core 2 Duo T9400 is a notebook processor while Core 2 Duo E6540 is a desktop one.

Should you still have questions on choice between Core 2 Duo T9400 and Core 2 Duo E6540, ask them in Comments section, and we shall answer.