Intel Core i5-1240P vs Intel Xeon E5-2676 v3 Comparison

The Intel Core i5-1240P and the Intel Xeon E5-2676 v3 represent two very different approaches to computing, separated by nearly a decade of architectural evolution. The former is a modern, power-efficient mobile processor built on Intel's 10 nm process, while the latter is a legacy, high-power server/workstation part from the 22 nm Haswell era. Benchmark data from Cinebench reveals a fascinating split: the i5-1240P dominates in most tests, but the Xeon E5-2676 v3 pulls off a significant victory in the most demanding multi-threaded workload, Cinebench R23. This head-to-head comparison uses only the provided metrics to dissect where each chip excels and for whom each is better suited.

Where Each One Wins

The most striking finding from the head-to-head benchmark results is that the Intel Core i5-1240P wins the majority of the tests, taking 5 out of 6. Its victories are most pronounced in single-core performance and in older multi-core benchmarks. In Cinebench R15 single-core, the i5-1240P scores 226 against the Xeon's 155, a massive 45.8% lead. Similarly, in Cinebench R20 single-core, the i5-1240P scores 795, which is 22.7% higher than the Xeon's 648. This pattern indicates that for tasks relying on rapid, per-thread execution—such as everyday application responsiveness, light gaming, and legacy software—the i5-1240P is the clear choice.

The i5-1240P also wins in multi-core tests from the R15 and R20 generations. In Cinebench R15 multi-core, it scores 1566.5 versus the Xeon's 1102, a 42.2% advantage. In Cinebench R20 multi-core, the gap narrows but remains substantial: 5632 for the i5-1240P versus 4592 for the Xeon, a 22.6% difference. These results suggest that for workloads built around Cinebench's R15 and R20 rendering engines, the newer processor's superior IPC (instructions per clock) and higher boost clocks more than compensate for its lower thread count (16 threads vs 24 threads).

However, the picture changes completely in the newest and most demanding test, Cinebench R23 multi-core. Here, the Xeon E5-2676 v3 achieves a score of 10935, beating the i5-1240P's 9392 by a significant 14.1% margin. This is the Xeon's only win, and it is a decisive one. This suggests that in modern, heavily multi-threaded workloads that can effectively utilize all 24 threads, the Xeon's raw core count and larger 30 MB L3 cache allow it to pull ahead. The data indicates that for sustained, massively parallel rendering tasks in the latest Cinebench iteration, the older server chip can still outmuscle the newer mobile chip.

Architecture Differences

The architectural divide between these two processors is stark. The Intel Core i5-1240P is built on the Alder Lake architecture using a 10 nm process node from Intel. It features 12 cores and 16 threads, a configuration that implies a mix of performance and efficiency cores. Its base clock is 1700.00 MHz, with a boost clock of 4.40 GHz. The chip uses an Intel BGA 1744 socket and has a 28 W TDP, confirming its mobile, power-conscious design. Its cache hierarchy includes 80 KB of L1 per core, 1.25 MB of L2 per core, and a shared 12 MB L3 cache. It supports DDR4 and DDR5 memory in a dual-channel configuration and lacks ECC memory support. The i5-1240P features integrated Iris Xe 80EU graphics and provides 20 PCIe Gen 4 lanes.

In contrast, the Intel Xeon E5-2676 v3 is a server/workstation part built on the older Haswell architecture using a 22 nm process. It also has 12 cores, but it supports 24 threads via Hyper-Threading, giving it a higher thread count. Its base clock is 2.40 GHz, boosting to 3.00 GHz. The Xeon operates on the Intel Socket 2011-3 platform and has a much higher 120 W TDP. Its cache structure is different: 64 KB of L1 per core, 256 KB of L2 per core, and a large shared 30 MB L3 cache. It supports both DDR3 and DDR4 memory across a quad-channel bus, offering a memory bandwidth of 68.3 GB/s, and it supports ECC memory. The Xeon has no integrated graphics and provides 40 PCIe Gen 3 lanes. Its transistor count is 2,600 million on a 356 mm² die, compared to the i5-1240P's 217 mm² die. The Xeon is marked as end-of-life, while the i5-1240P is still active.

Head-to-Head Benchmarks

Examining the benchmark results in detail reveals the shifting balance of power. The most lopsided victory for the Intel Core i5-1240P comes in Cinebench R15 single-core, where its score of 226 eclipses the Xeon's 155 by 45.8%. This is a clear indicator of the i5-1240P's architectural and clock-speed advantage in light, single-threaded tasks. In the multi-core version of R15, the i5-1240P again triumphs with 1566.5 versus 1102, a 42.2% lead. This performance gap is so large that it suggests the Xeon's additional threads are not being effectively utilized by this older benchmark, which likely favors faster individual cores.

Moving to Cinebench R20, the i5-1240P continues its winning streak but with a reduced margin. Its single-core score of 795 beats the Xeon's 648 by 22.7%. In multi-core, the i5-1240P scores 5632 against 4592, a 22.6% advantage. These results show that as the workload scales, the Xeon's 24 threads begin to close the gap, but the i5-1240P's superior per-core performance still carries the day.

The trend reverses dramatically in Cinebench R23 multi-core. The Xeon E5-2676 v3 posts a score of 10935, defeating the i5-1240P's 9392 by 14.1%. This is a substantial turnaround. The Xeon's 24 threads, combined with its large 30 MB L3 cache, allow it to handle the more complex and scalable R23 workload far more efficiently than the i5-1240P's 16-thread design. However, the i5-1240P still manages to win in Cinebench R23 single-core, scoring 1600 versus 1543, a narrow 3.7% lead, proving its single-core dominance persists even in the newest test.

FAQ

Q: Which processor has a higher single-core score in Cinebench R20?

A: The Intel Core i5-1240P is the winner, with a score of 795 compared to the Xeon E5-2676 v3's 648, a difference of 22.7%.

Q: Is there any benchmark where the Xeon E5-2676 v3 outperforms the i5-1240P?

A: Yes. In Cinebench R23 multi-core, the Xeon E5-2676 v3 scores 10935 against the i5-1240P's 9392, leading by 14.1%.

Q: What are the thread counts of these two processors?

A: The Intel Core i5-1240P has 12 cores and 16 threads, while the Intel Xeon E5-2676 v3 has 12 cores and 24 threads.

Q: Which CPU supports ECC memory?

A: The Intel Xeon E5-2676 v3 supports ECC memory, while the Intel Core i5-1240P does not.

Q: What is the TDP of the mobile i5-1240P?

A: The Intel Core i5-1240P has a TDP of 28 W, which is significantly lower than the Xeon's 120 W.

Q: How much larger is the L3 cache on the Xeon compared to the i5?

A: The Xeon E5-2676 v3 has a shared 30 MB L3 cache, while the Intel Core i5-1240P has a shared 12 MB L3 cache.

The Verdict

The benchmark data paints a clear picture of two processors for very different purposes. The Intel Core i5-1240P is the superior general-purpose processor. It wins 5 out of 6 head-to-head benchmarks, including all single-core tests and the multi-core tests in Cinebench R15 and R20. Its performance is decisively better in legacy and moderately-threaded workloads, and its significantly lower TDP and integrated graphics make it the obvious choice for a mobile or power-constrained system. Users who prioritize responsive single-threaded performance or run older software will find the i5-1240P to be far more capable.

The Intel Xeon E5-2676 v3, despite being an older, end-of-life part, still holds a specific niche. Its victory in Cinebench R23 multi-core, by a substantial 14.1%, demonstrates that for modern, heavily multi-threaded applications that can leverage all 24 threads, it remains a potent force. Its support for ECC memory and quad-channel DDR4 also points to a workstation or server environment where data integrity and memory bandwidth are critical. Therefore, the verdict is straightforward: the i5-1240P is the pick for most users needing a fast, efficient, and versatile processor. The Xeon E5-2676 v3 is the pick for users running the most demanding, thread-scalable rendering workloads and who require ECC memory support, provided they can accommodate its 120 W TDP.