Intel Core i7-7820HK vs Intel Xeon E3-1280 v5 Comparison

Head-to-Head Benchmarks

The recorded data paints a clear picture: the Intel Xeon E3-1280 v5 wins every single benchmark comparison in this matchup, taking all six head-to-head tests. The Intel Core i7-7820HK, despite being a capable mobile processor, trails consistently across the entire Cinebench suite, with the Xeon holding a steady advantage of roughly 10% in every test.

In Cinebench R15 multi-core, the Xeon E3-1280 v5 scores 707 against the i7-7820HK's 635, a delta of -10.2% for the mobile chip. The single-core R15 test shows the same pattern: 99 for the Xeon versus 89 for the Core i7, a 10.1% deficit. These margins repeat almost exactly in the newer Cinebench versions. R20 multi-core sees the Xeon post 2946 while the i7 manages 2648, again -10.1%. R20 single-core is 415 versus 373, also -10.1%. The R23 results continue the trend with the Xeon at 7015 multi-core and 990 single-core, against the i7's 6306 and 890, respectively, each showing a 10.1% gap.

What stands out is the uniformity of the margin. Across six different workloads, the delta never deviates beyond 0.1 percentage points. This suggests a fundamental clock-speed and efficiency advantage for the Xeon rather than any workload-specific quirk. The Xeon's higher base clock of 3.70 GHz versus 2.90 GHz, and its boost clock of 4.00 GHz versus 3.90 GHz, explain part of this consistent edge. The i7-7820HK does have an unlocked multiplier, which could allow manual overclocking, but the stock benchmark data shows no such adjustment; these are factory-default scores.

Looking at the broader database context, the i7-7820HK sits at the 46th percentile of all CPUs with an average benchmark score of 2048. Its nearest rivals include the Intel Xeon E3-1270 v5 at identical 2048, the AMD Ryzen 5 7520U at 2046 (0.1% lower), and the Intel Xeon E3-1275 v5 at 2043 (0.2% lower). The Xeon E3-1280 v5, meanwhile, lands at the 45th percentile with an average score of 2029, placing it near the Xeon E3-1260L v5 (2029), the Xeon E3-1240 v5 (2030, 0.1% higher), and the Core i7-5775R (2031, 0.1% higher). Despite the i7-7820HK having a slightly higher percentile ranking, the direct head-to-head data shows the Xeon winning every test.

The average benchmark scores are close, 2048 for the i7 versus 2029 for the Xeon, but this aggregate metric masks the head-to-head reality. The i7's average is buoyed by its Geekbench results, which are not part of the head-to-head comparison. The Xeon has no Geekbench scores recorded in the database, so the head-to-head relies solely on Cinebench, where the Xeon is uniformly superior.

Where Each One Wins

The data offers no ambiguity: the Intel Xeon E3-1280 v5 wins in every measured category. There are no benchmark tests in the head-to-head set where the Core i7-7820HK comes out ahead. The Xeon's advantage spans both multi-threaded and single-threaded workloads, across three generations of Cinebench (R15, R20, and R23). This consistency indicates that the Xeon is the stronger choice for rendering, CPU-bound productivity, and any task that relies heavily on raw processor throughput.

For the i7-7820HK, the wins are not in performance but in platform characteristics. It is a mobile processor with a 45 W TDP, whereas the Xeon is a server/workstation chip with an 80 W TDP. The i7 includes integrated graphics (Intel HD Graphics 630), while the Xeon has no integrated GPU. The i7 also supports both DDR3 and DDR4 memory, while the Xeon supports only DDR4. These are not benchmark wins, but they matter for system design. A user building a compact laptop or a low-power mini-PC would find the i7's feature set more fitting, even though it loses every performance test.

The Xeon's ECC memory support is another differentiator. The i7-7820HK does not support ECC, while the Xeon E3-1280 v5 does. This makes the Xeon the only choice for workloads that require error-correcting memory, such as long-running server processes or financial computations where data integrity is paramount. The Xeon's market segment is explicitly "Server/Workstation," and its feature set aligns with that role.

The i7-7820HK's unlocked multiplier is its one clear performance-related advantage. The Xeon's multiplier is locked, meaning users cannot adjust the clock multiplier on the Xeon. The i7, being a "K" series part, allows overclocking. However, the recorded benchmarks show stock performance only; no overclocked results are in the database. At stock settings, the Xeon wins every test, but an overclocked i7 could potentially close or reverse the gap in some workloads. The data cannot confirm this because no overclocked scores exist.

The Verdict

From the recorded benchmark data, the Intel Xeon E3-1280 v5 is the outright performance winner. It beats the Core i7-7820HK by 10.1% in every single Cinebench test, both single-core and multi-core, across R15, R20, and R23. If raw CPU performance is the only criterion, the choice is straightforward: the Xeon E3-1280 v5.

However, the i7-7820HK is not without merit. It draws significantly less power, with a 45 W TDP versus the Xeon's 80 W. It includes integrated graphics, which the Xeon lacks entirely. It supports a wider range of memory types (DDR3 and DDR4 versus DDR4 only). And it has an unlocked multiplier for potential overclocking. For a mobile workstation or a compact desktop where power and space are constrained, the i7 may be the more practical choice despite losing every benchmark.

The Xeon E3-1280 v5, by contrast, is built for server and workstation duty. Its ECC memory support, higher clocks, and consistent 10% performance lead make it the better pick for a stationary machine where performance and reliability are the top priorities. The 80 W TDP is a non-issue in a proper workstation chassis with adequate cooling, and the lack of integrated graphics is irrelevant if a discrete GPU is already planned.

The percentile data shows the i7-7820HK at 46% versus the Xeon at 45%, but this is a global ranking across all CPUs and is influenced by the i7's Geekbench scores, which are not part of the head-to-head. When comparing these two directly, the Xeon wins 6-0. The verdict from the data: choose the Xeon E3-1280 v5 for performance, choose the i7-7820HK for power efficiency, integrated graphics, and overclocking headroom.

FAQ

Q: Which CPU is faster in multi-core workloads?

A: The Intel Xeon E3-1280 v5 wins all three multi-core Cinebench tests. It scores 707 in R15, 2946 in R20, and 7015 in R23, versus the i7-7820HK's 635, 2648, and 6306, respectively. The Xeon leads by 10.1% in each case.

Q: Is the i7-7820HK better in single-core performance?

A: No. The Xeon E3-1280 v5 also wins every single-core test. It posts 99 in R15, 415 in R20, and 990 in R23, while the i7-7820HK manages 89, 373, and 890. The margin is consistently around 10.1%.

Q: Does the i7-7820HK have integrated graphics?

A: Yes. The i7-7820HK includes Intel HD Graphics 630. The Xeon E3-1280 v5 has no integrated graphics at all, so a discrete GPU is required for any display output on the Xeon.

Q: Which CPU supports ECC memory?

A: Only the Intel Xeon E3-1280 v5 supports ECC memory. The i7-7820HK does not have ECC support. This makes the Xeon the only option for systems that require error-correcting memory.

Q: What are the power consumption differences?

A: The i7-7820HK has a TDP of 45 W, while the Xeon E3-1280 v5 has a TDP of 80 W. The i7 is designed for mobile use, while the Xeon is rated for server and workstation environments.

Q: Can either CPU be overclocked?

A: The i7-7820HK has an unlocked multiplier, so it can be overclocked. The Xeon E3-1280 v5 has a locked multiplier and cannot be overclocked. The benchmark data reflects stock settings only.

Q: How do these CPUs compare to their nearest rivals in the database?

A: The i7-7820HK averages 2048, identical to the Intel Xeon E3-1270 v5, and is within 0.2% of the Xeon E3-1275 v5 and 0.1% of the AMD Ryzen 5 7520U. The Xeon E3-1280 v5 averages 2029, matching the Xeon E3-1260L v5, and is within 0.1% of the Xeon E3-1240 v5 and Core i7-5775R.

Architecture Differences

The two processors come from different Intel generations and serve different markets. The Core i7-7820HK is built on Kaby Lake architecture (codename Kaby Lake-H) and released in 2017. The Xeon E3-1280 v5 uses Skylake architecture (codename Skylake-DT) and was released in 2015. Both are manufactured on Intel's 14 nm process node, and both use the same foundry, Intel. The die sizes are close: 126 mm² for the i7 and 122 mm² for the Xeon. The Xeon's transistor count is listed at 1,750 million, while no transistor count is recorded for the i7.

The core and thread counts are identical: 4 cores and 8 threads for both. Cache hierarchies are also the same: 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3. The difference lies in clock speeds. The i7-7820HK has a base clock of 2.90 GHz and a boost clock of 3.90 GHz. The Xeon E3-1280 v5 starts at 3.70 GHz base and boosts to 4.00 GHz. This 0.8 GHz base clock advantage and 0.1 GHz boost advantage explain the consistent performance lead.

The sockets differ significantly. The i7-7820HK uses Intel BGA 1440, which is a soldered, non-upgradeable mobile socket. The Xeon E3-1280 v5 uses Intel Socket 1151, a standard LGA socket that allows the CPU to be replaced. This makes the Xeon a more serviceable option in a desktop or workstation. The i7's BGA socket is typical for laptops, where the CPU is permanently attached to the motherboard.

Memory support differs as well. The i7-7820HK supports both DDR3 and DDR4, while the Xeon E3-1280 v5 supports only DDR4. Both use a dual-channel memory bus. The i7 supports non-ECC memory only, while the Xeon supports ECC memory. This is a critical distinction for server workloads. The i7 includes integrated graphics (Intel HD Graphics 630), while the Xeon has no integrated graphics. Both CPUs provide PCIe Gen 3 with 16 lanes from the CPU.

The market segments are polar opposites. The i7-7820HK is a mobile processor, designed for high-end laptops and compact systems. The Xeon E3-1280 v5 is a server/workstation processor. Both are end-of-life in production status. The i7 has an unlocked multiplier, making it overclockable, while the Xeon's multiplier is locked. The launch MSRP for the i7-7820HK is $378, while the Xeon E3-1280 v5 launched at $612. The part numbers are SR32P for the i7 and SR2LC for the Xeon.