Intel Core i7-3930K vs Intel Xeon E3-1230 v5 Comparison

The Intel Core i7-3930K and the Intel Xeon E3-1230 v5 occupy different corners of the Intel lineup, yet their benchmark scores land them in the same percentile bracket. Both sit at the 44th percentile among all CPUs, and their average benchmark scores are nearly identical: 1960 for the i7-3930K versus 1947 for the Xeon E3-1230 v5. The data shows a generational clash: a six-core Sandy Bridge-E desktop flagship from 2011 against a four-core Skylake server/workstation part from 2015. The older chip wins every single head-to-head benchmark, but the margins are consistently slim, ranging from 3.2% to 3.4%. This makes the choice less about raw speed and more about platform features and workload fit.

Where Each One Wins

The Intel Core i7-3930K wins in every benchmark category recorded. In Cinebench R15 multicore, it scores 701 against the Xeon's 678, a 3.4% lead. The single-core R15 result is 98 versus 95, a 3.2% edge. The pattern holds across Cinebench R20 and R23, with the i7-3930K posting 2921 and 6955 respectively, while the Xeon E3-1230 v5 reaches 2827 and 6733. Geekbench results also favor the i7-3930K: 2991 multicore and 617 singlecore, though no Geekbench scores are listed for the Xeon. The i7-3930K also benefits from an unlocked multiplier, meaning the headroom for overclocking exists, while the Xeon's multiplier is locked.

The Xeon E3-1230 v5 does not win a single benchmark in this comparison, but it wins on platform attributes. It supports ECC memory, which the i7-3930K does not. It also supports both DDR3 and DDR4, whereas the i7-3930K is limited to DDR3. The Xeon's 80 W TDP is significantly lower than the i7-3930K's 130 W, and its 14 nm process node is much more modern than the 32 nm node of the older chip. For a workstation or server build where stability and memory integrity matter more than peak multi-core throughput, the Xeon's feature set is the deciding factor.

Architecture Differences

The i7-3930K is built on Sandy Bridge-E, a 32 nm design with 2,270 million transistors on a 435 mm² die. It packs six cores and twelve threads, with a base clock of 3.20 GHz and a boost clock of 3.80 GHz. The L3 cache is 12 MB shared, and each core gets 64 KB of L1 and 256 KB of L2. Memory support is DDR3 over a quad-channel bus, yielding 51.2 GB/s of bandwidth. The PCIe interface is Gen 3 with 40 lanes from the CPU. It was released on November 13, 2011, with a launch MSRP of $583, and its production status is end-of-life.

The Xeon E3-1230 v5 is a Skylake-DT part built on a 14 nm process, with 1,750 million transistors on a 122 mm² die. It has four cores and eight threads, with a base clock of 3.40 GHz and a boost clock of 3.80 GHz. The L3 cache is 8 MB shared, with the same per-core L1 and L2 sizes as the i7-3930K. Memory support includes both DDR3 and DDR4, but the bus is dual-channel, capping bandwidth at 34.1 GB/s. PCIe is Gen 3 with 16 lanes from the CPU. It supports ECC memory, a key differentiator. Released on October 18, 2015, with a launch MSRP of $261, it is also end-of-life.

The architectural gap is stark: two process generations apart, with the Xeon using a much denser 14 nm node and a smaller die. The i7-3930K compensates with more cores, more cache, and a wider memory bus. The Xeon counters with newer IPC, lower power draw, and ECC support.

FAQ

Q: Which CPU has more cores and threads?

A: The Intel Core i7-3930K has six cores and twelve threads, while the Intel Xeon E3-1230 v5 has four cores and eight threads.

Q: Does the Xeon E3-1230 v5 support ECC memory?

A: Yes, the Xeon E3-1230 v5 supports ECC memory. The Intel Core i7-3930K does not support ECC memory.

Q: What is the performance difference in Cinebench R23 multicore?

A: The i7-3930K scores 6955, and the Xeon E3-1230 v5 scores 6733. The i7-3930K wins by 3.3%.

Q: Which CPU has a higher base clock speed?

A: The Xeon E3-1230 v5 has a base clock of 3.40 GHz, which is higher than the i7-3930K's 3.20 GHz base clock. Both have the same boost clock of 3.80 GHz.

Q: Can either CPU be overclocked?

A: The Intel Core i7-3930K has an unlocked multiplier, so it can be overclocked. The Xeon E3-1230 v5 has a locked multiplier and cannot be overclocked.

Q: Which CPU has a higher memory bandwidth?

A: The i7-3930K has a quad-channel memory bus with 51.2 GB/s bandwidth. The Xeon E3-1230 v5 has a dual-channel bus with 34.1 GB/s bandwidth.

Specification Differences

The two CPUs differ in nearly every core specification. The i7-3930K offers six cores and twelve threads, while the Xeon E3-1230 v5 offers four cores and eight threads. The base clock favors the Xeon at 3.40 GHz versus 3.20 GHz, but the boost clock is identical at 3.80 GHz. The i7-3930K has a TDP of 130 W, whereas the Xeon E3-1230 v5 draws only 80 W. Process technology separates them: 32 nm for the i7-3930K, 14 nm for the Xeon.

The die size difference is dramatic: 435 mm² for the i7-3930K versus 122 mm² for the Xeon. Transistor counts are 2,270 million and 1,750 million, respectively. L3 cache is 12 MB on the i7-3930K and 8 MB on the Xeon. Memory support shows the Xeon accepting both DDR3 and DDR4, while the i7-3930K is DDR3-only. The memory bus is quad-channel on the i7-3930K and dual-channel on the Xeon, with bandwidth of 51.2 GB/s versus 34.1 GB/s. ECC support is exclusive to the Xeon. PCIe lanes are 40 on the i7-3930K and 16 on the Xeon. The socket differs: Intel Socket 2011 for the i7-3930K, Intel Socket 1151 for the Xeon.

The i7-3930K has an unlocked multiplier, while the Xeon's is locked. Market segments also differ: the i7-3930K is a desktop part, and the Xeon E3-1230 v5 is a server/workstation part. Release dates are November 13, 2011, for the i7-3930K and October 18, 2015, for the Xeon.

Head-to-Head Benchmarks

The head-to-head results are consistent across all six Cinebench tests: the i7-3930K wins every time, and the margin is tight. In Cinebench R15 multicore, the i7-3930K scores 701 against 678, a 3.4% delta. The single-core R15 test shows 98 versus 95, a 3.2% delta. Cinebench R20 multicore results are 2921 versus 2827, a 3.3% delta, and single-core R20 is 412 versus 399, also a 3.3% delta. Cinebench R23 multicore follows the same pattern: 6955 versus 6733, a 3.3% delta, with single-core R23 at 981 versus 950, a 3.3% delta.

These margins tell a clear story. The i7-3930K's advantage comes from its two extra cores and four extra threads, which help in multicore workloads. The single-core results are closer, with the i7-3930K leading by about 3%, which is surprising given the Xeon's newer architecture. The Xeon's higher base clock of 3.40 GHz does not translate into a single-core win, as the i7-3930K's 3.80 GHz boost clock matches the Xeon's, and the older architecture still edges ahead.

Geekbench data is incomplete for the Xeon, but the i7-3930K posts 2991 multicore and 617 singlecore. The average benchmark score for the i7-3930K is 1960, and for the Xeon it is 1947, a difference of 13 points. The i7-3930K's nearest rivals include the Intel Xeon D-2712T with an average score of 1964 (a -0.2% delta) and the AMD Ryzen 5 2600H at 1967 (-0.3%). The Xeon E3-1230 v5's nearest rivals include the Intel Core i5-1035G7 at 1948 (-0.1%) and the Intel Core i7-9850HL at 1941 (+0.3%). Both CPUs sit in the same performance neighborhood, surrounded by different competitors.

The Verdict

The data points to a straightforward split. If you need multi-core throughput and the ability to overclock, the Intel Core i7-3930K is the pick. It wins every benchmark, with a 3.4% lead in Cinebench R15 multicore and a 3.3% lead in R20 and R23 multicore. Its six cores and twelve threads provide more parallel processing headroom, and the unlocked multiplier allows for tuning beyond stock clocks. The quad-channel memory bus with 51.2 GB/s bandwidth is another advantage for memory-heavy tasks.

If you need ECC memory support and lower power consumption, the Intel Xeon E3-1230 v5 is the better fit. It draws 80 W versus 130 W, uses a modern 14 nm process, and supports both DDR3 and DDR4. Its dual-channel memory bus limits bandwidth to 34.1 GB/s, but for a server or workstation where data integrity is critical, ECC support outweighs the slight performance deficit. The Xeon also carries a lower launch MSRP of $261, though the i7-3930K's $583 launch MSRP reflects its higher core count and desktop flagship status.

The benchmarks show that the i7-3930K is faster in every test, but the margins are slim enough that the Xeon's platform features can justify its selection in the right context. Neither CPU is a clear winner overall; the choice depends on whether you prioritize raw performance and overclocking or ECC reliability and efficiency. Both are end-of-life products, so availability and platform fit will likely be the deciding factors in practice.