i7-840QM vs Xeon D-1521
Aggregate performance score
Xeon D-1521 outperforms Core i7-840QM by a whopping 191% based on our aggregate benchmark results.
Primary details
Comparing Xeon D-1521 and Core i7-840QM processor market type (desktop or notebook), architecture, sales start time and price.
| Place in the ranking | 1509 | 2310 |
| Place by popularity | not in top-100 | not in top-100 |
| Cost-effectiveness evaluation | 2.40 | no data |
| Market segment | Server | Laptop |
| Series | Intel Xeon D | Intel Core i7 |
| Power efficiency | 7.53 | 2.59 |
| Architecture codename | Broadwell (2015−2019) | Clarksfield (2009−2010) |
| Release date | 1 November 2015 (9 years ago) | 20 June 2010 (14 years ago) |
| Launch price (MSRP) | $199 | $568 |
Cost-effectiveness evaluation
Performance per price, higher is better.
Detailed specifications
Xeon D-1521 and Core i7-840QM 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 | 8 |
| Base clock speed | 2.4 GHz | 1.86 GHz |
| Boost clock speed | 2.7 GHz | 3.2 GHz |
| Bus type | DMI 2.0 | DMI 1.0 |
| Bus rate | no data | 2.5 GT/s |
| Multiplier | 24 | 14 |
| L1 cache | 64K (per core) | 64 KB (per core) |
| L2 cache | 256K (per core) | 256 KB (per core) |
| L3 cache | 1.5 MB (per core) | 8 MB (shared) |
| Chip lithography | 14 nm | 45 nm |
| Die size | 246.24 mm2 | 296 mm2 |
| Maximum core temperature | no data | 100 °C |
| Maximum case temperature (TCase) | 80 °C | no data |
| Number of transistors | 3,200 million | 774 million |
| 64 bit support | + | + |
| Windows 11 compatibility | - | - |
Compatibility
Information on Xeon D-1521 and Core i7-840QM 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 (Uniprocessor) | 1 (Uniprocessor) |
| Socket | FCBGA1667 | FCPGA988,PGA988 |
| Power consumption (TDP) | 45 Watt | 45 Watt |
Technologies and extensions
Technological solutions and additional instructions supported by Xeon D-1521 and Core i7-840QM. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® AVX2 | Intel® SSE4.2 |
| AES-NI | + | - |
| AVX | + | - |
| vPro | no data | + |
| Enhanced SpeedStep (EIST) | + | + |
| Turbo Boost Technology | 2.0 | + |
| Hyper-Threading Technology | + | + |
| TSX | + | - |
| Idle States | + | + |
| Thermal Monitoring | + | + |
| PAE | no data | 36 Bit |
| GPIO | + | no data |
Security technologies
Xeon D-1521 and Core i7-840QM technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | + |
| EDB | + | + |
| Secure Key | + | no data |
| OS Guard | + | no data |
Virtualization technologies
Virtual machine speed-up technologies supported by Xeon D-1521 and Core i7-840QM are enumerated here.
| VT-d | + | + |
| VT-x | + | + |
| EPT | + | + |
Memory specs
Types, maximum amount and channel quantity of RAM supported by Xeon D-1521 and Core i7-840QM. Depending on the motherboard, higher memory frequencies may be supported.
| Supported memory types | DDR4, DDR3 | DDR3 |
| Maximum memory size | 128 GB | 8 GB |
| Max memory channels | 2 | 2 |
| Maximum memory bandwidth | 34.124 GB/s | 21.335 GB/s |
| ECC memory support | + | - |
Graphics specifications
General parameters of integrated GPUs, if any.
| Integrated graphics card | no data | None |
Peripherals
Specifications and connection of peripherals supported by Xeon D-1521 and Core i7-840QM.
| PCIe version | 2.0/3.0 | 2 |
| PCI Express lanes | 24 | 16 |
| USB revision | 2.0/3.0 | no data |
| Total number of SATA ports | 6 | no data |
| Number of USB ports | 8 | no data |
| Integrated LAN | + | no data |
| UART | + | no data |
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.
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.
Pros & cons summary
| Performance score | 3.58 | 1.23 |
| Recency | 1 November 2015 | 20 June 2010 |
| Chip lithography | 14 nm | 45 nm |
Xeon D-1521 has a 191.1% higher aggregate performance score, an age advantage of 5 years, and a 221.4% more advanced lithography process.
The Xeon D-1521 is our recommended choice as it beats the Core i7-840QM in performance tests.
Be aware that Xeon D-1521 is a server/workstation processor while Core i7-840QM is a notebook one.
Should you still have questions on choice between Xeon D-1521 and Core i7-840QM, ask them in Comments section, and we shall answer.
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