Pentium 4 HT 651 vs Core 2 Extreme QX9650

Primary details

Comparing Core 2 Extreme QX9650 and Pentium 4 HT 651 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	not rated	not rated
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Architecture codename	Yorkfield (2007−2009)	Cedar Mill (2006)
Release date	November 2007 (17 years ago)	January 2006 (18 years ago)

Detailed specifications

Core 2 Extreme QX9650 and Pentium 4 HT 651 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	2
Base clock speed	3 GHz	no data
Boost clock speed	3 GHz	3.4 GHz
Bus rate	1333 MHz	no data
L1 cache	64K (per core)	28 KB
L2 cache	12 MB (shared)	2 MB
L3 cache	0 KB	0 KB
Chip lithography	45 nm	65 nm
Die size	2x 107 mm2	81 mm2
Maximum case temperature (TCase)	64 °C	no data
Number of transistors	820 million	188 million
64 bit support	+	+
Windows 11 compatibility	-	-
Unlocked multiplier	+	-
VID voltage range	0.85V-1.3625V	no data

Compatibility

Information on Core 2 Extreme QX9650 and Pentium 4 HT 651 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	1
Socket	LGA775	775
Power consumption (TDP)	130 Watt	86 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Core 2 Extreme QX9650 and Pentium 4 HT 651. You'll probably need this information if you require some particular technology.

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 Extreme QX9650 and Pentium 4 HT 651 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 Extreme QX9650 and Pentium 4 HT 651 are enumerated here.

VT-x

+

no data

Memory specs

Types, maximum amount and channel quantity of RAM supported by Core 2 Extreme QX9650 and Pentium 4 HT 651. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

DDR1, DDR2, DDR3

Pros & cons summary

---

Physical cores	4	1
Threads	4	2
Chip lithography	45 nm	65 nm
Power consumption (TDP)	130 Watt	86 Watt

---

Should you still have questions on choice between Core 2 Extreme QX9650 and Pentium 4 HT 651, ask them in Comments section, and we shall answer.

Vote for your favorite

Do you think we are right or mistaken in our choice? Vote by clicking "Like" button near your favorite CPU.

---