Performance per price, higher is better.
Intel Xeon E5645: specs and benchmarks
Aggregated performance score
Summary
Intel started Xeon E5645 sales 16 March 2010 at a recommended price of $294. This is a Westmere-EP architecture desktop processor primarily aimed at office systems. It has 6 cores and 12 threads, and is based on 32 nm manufacturing technology, with a maximum frequency of 2670 MHz and a locked multiplier.
Compatibility-wise, this is FCLGA1366,LGA1366 processor with a TDP of 80 Watt. It supports DDR3 memory.
It provides poor benchmark performance at 3.29% of a leader's which is AMD Ryzen Threadripper PRO 7995WX.
General info
Xeon E5645 processor market type (desktop or notebook), architecture, sales start time and pricing.
| Place in performance ranking | 1479 | |
| Place by popularity | not in top-100 | |
| Value for money | 0.99 | |
| Market segment | Server | |
| Architecture codename | Westmere-EP (2010−2011) | |
| Release date | 16 March 2010 (14 years old) | |
| Launch price (MSRP) | $294 | of 305 (Core i7-870) |
| Current price | $250 (0.9x MSRP) | of 17802 (Threadripper PRO 7995WX) |
Value for money
Technical specs
Basic microprocessor parameters such as number of cores, number of threads, base frequency and turbo boost clock, lithography, cache size and multiplier lock state. These parameters can generally indicate CPU performance, but to be more precise you have to review its test results.
| Physical cores | 6 (Hexa-Core) | |
| Threads | 12 | |
| Base clock speed | 2.4 GHz | of 4.7 (FX-9590) |
| Boost clock speed | 2.67 GHz | of 6.2 (Core i9-14900KS) |
| L1 cache | 64 KB (per core) | of 7475.2 (Apple M2 Pro 10-Core) |
| L2 cache | 256 KB (per core) | of 36864 (Apple M2 Max) |
| L3 cache | 12 MB (shared) | of 768 (EPYC 7373X) |
| Chip lithography | 32 nm | of 3 (Apple M3 Max 16-Core) |
| Die size | 239 mm2 | |
| Maximum core temperature | 76 °C | of 110 (Atom x7-E3950) |
| Number of transistors | 1,170 million | of 9900000 (Ryzen 5 7645HX) |
| 64 bit support | + | |
| Windows 11 compatibility | - | |
| Unlocked multiplier | No |
Compatibility
Information on Xeon E5645 compatibility with other computer components and devices: 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 | 2 | of 8 (Opteron 842) |
| Socket | FCLGA1366,LGA1366 | |
| Power consumption (TDP) | 80 Watt | of 400 (Xeon Platinum 9282) |
Technologies and extensions
Technological capabilities and additional instructions supported by Xeon E5645. You'll probably need this information if you require some particular technology.
| Instruction set extensions | Intel® SSE4.2 | |
| AES-NI | + | |
| Enhanced SpeedStep (EIST) | + | |
| Turbo Boost Technology | 1.0 | |
| Hyper-Threading Technology | + | |
| Idle States | + | |
| Thermal Monitoring | - | |
| Demand Based Switching | + | |
| PAE | 40 Bit | |
| Status | Discontinued |
Security technologies
Processor technologies aimed at improving security, for example, by protecting against hacks.
| TXT | + | |
| EDB | + |
Virtualization technologies
Supported virtual machine optimization technologies. Some are specific to Intel only, some to AMD.
| VT-d | + | |
| VT-x | + | |
| EPT | + |
Memory specs
Types, maximum amount and channel number of RAM supported by Xeon E5645's memory controller. Depending on the motherboard, higher memory frequency may be supported.
| Supported memory types | DDR3 | |
| Maximum memory size | 288 GB | of 786 (Xeon E5-2670 v3) |
| Max memory channels | 3 | of 12 (Xeon Platinum 9221) |
| Maximum memory bandwidth | 32 GB/s | of 460.8 (EPYC 9124) |
| ECC memory support | + |
Peripherals
Specifications and connection types of supported peripherals.
| PCIe version | 2.0 | of 5 (Core i9-12900K) |
Benchmark performance
Single-core and multi-core benchmark results of Xeon E5645. Overall benchmark performance 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.
Benchmark coverage: 68%
GeekBench 5 Single-Core
GeekBench 5 Single-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses only a single CPU core.
Benchmark coverage: 42%
GeekBench 5 Multi-Core
GeekBench 5 Multi-Core is a cross-platform application developed in the form of CPU tests that independently recreate certain real-world tasks with which to accurately measure performance. This version uses all available CPU cores.
Benchmark coverage: 42%
Send in your benchmark results
Send your test results of Xeon E5645.
Relative perfomance
Overall Xeon E5645 performance compared to nearest competitors among server CPUs.
Similar processors
Here is our recommendation of several processors that are more or less close in performance to the one reviewed.
Recommended GPUs
People consider these graphics cards to be good for Xeon E5645, according to our PC configuration statistics.
6.9%
6.1%
5.6%
4.8%
3.5%
2.6%
2.6%
These are the fastest graphics cards for Xeon E5645 in our user configuration statistics. There is a total of 230 configurations based on Xeon E5645 in our database.
0.9% (2/230)
0.9% (2/230)
0.4% (1/230)
1.3% (3/230)
0.4% (1/230)
0.4% (1/230)
0.9% (2/230)
0.4% (1/230)
0.4% (1/230)
0.9% (2/230)
