Pentium 4 HT 661 vs Pentium D 915

Primary details

Comparing Pentium D 915 and Pentium 4 HT 661 processor market type (desktop or notebook), architecture, sales start time and price.

Place in the ranking	3110	not rated
Place by popularity	not in top-100	not in top-100
Market segment	Desktop processor	Desktop processor
Power efficiency	0.29	no data
Architecture codename	Presler (2005−2007)	Cedar Mill (2006)
Release date	23 July 2006 (18 years ago)	5 January 2006 (18 years ago)
Launch price (MSRP)	$74	$401

Detailed specifications

Pentium D 915 and Pentium 4 HT 661 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)	1 (Single-Core)
Threads	2	2
Base clock speed	2.8 GHz	3.6 GHz
Boost clock speed	2.8 GHz	3.6 GHz
L1 cache	16 KB (per core)	28 KB
L2 cache	2 MB (per die)	2 MB
L3 cache	0 KB	0 KB
Chip lithography	65 nm	65 nm
Die size	2x 81 mm2	81 mm2
Maximum case temperature (TCase)	63 °C	69 °C
Number of transistors	376 million	188 million
64 bit support	+	+
Windows 11 compatibility	-	-
VID voltage range	1.2V-1.3375V	no data

Compatibility

Information on Pentium D 915 and Pentium 4 HT 661 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,PLGA775	775
Power consumption (TDP)	95 Watt	86 Watt

Technologies and extensions

Technological solutions and additional instructions supported by Pentium D 915 and Pentium 4 HT 661. You'll probably need this information if you require some particular technology.

Enhanced SpeedStep (EIST)	+	+
Turbo Boost Technology	-	no data
Hyper-Threading Technology	-	no data
Idle States	+	no data
Demand Based Switching	-	no data
PAE	32 Bit	no data
FSB parity	-	no data

Security technologies

Pentium D 915 and Pentium 4 HT 661 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 Pentium D 915 and Pentium 4 HT 661 are enumerated here.

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

Memory specs

Types, maximum amount and channel quantity of RAM supported by Pentium D 915 and Pentium 4 HT 661. Depending on the motherboard, higher memory frequencies may be supported.

Supported memory types

DDR1, DDR2, DDR3

DDR1, DDR2, DDR3

Graphics specifications

General parameters of integrated GPUs, if any.

Integrated graphics card

On certain motherboards (Chipset feature)

no data

Pros & cons summary

---

Recency	23 July 2006	5 January 2006
Physical cores	2	1
Power consumption (TDP)	95 Watt	86 Watt

---

Should you still have questions on choice between Pentium D 915 and Pentium 4 HT 661, 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.

---