Intel Core i5-8300H vs Intel Core i7-3960X Comparison

Head-to-Head Benchmarks

The benchmark data presents a striking split between these two processors. The Intel Core i7-3960X wins six of the eight head-to-head comparisons, while the Intel Core i5-8300H takes two decisive victories. The pattern is consistent: the older desktop part dominates Cinebench workloads, while the newer mobile chip crushes Geekbench tests.

In Cinebench R15 multicore, the i7-3960X scores 722 against 629 for the i5-8300H, a 14.8% advantage. The single-core R15 result is even more lopsided: 102 versus 88, a 15.9% lead. These margins repeat almost identically across the newer Cinebench versions. In R20 multicore, the i7-3960X posts 3011 versus 2622, again 14.8% ahead. The R20 single-core test shows 425 versus 370, a 14.9% gap. Cinebench R23 multicore delivers 7170 versus 6245 (14.8%), and R23 single-core lands at 1012 versus 881 (14.9%). The consistency of these deltas across three Cinebench generations suggests a stable architectural advantage rather than a workload-specific quirk.

The Geekbench results flip the script entirely. In Geekbench multicore, the i5-8300H scores 3920 against just 3193 for the i7-3960X. That is an 18.5% deficit for the older chip. The single-core Geekbench test is catastrophic for the i7-3960X: 657 versus 1286, a 48.9% gap. The Coffee Lake part more than doubles the Sandy Bridge part in this specific metric. This is the largest single margin in the entire comparison, and it highlights how differently these two chips respond to divergent benchmark methodologies.

What explains the split? The Cinebench suite leans on sustained multicore rendering, where the i7-3960X's six cores and twelve threads outmuscle the i5-8300H's four cores and eight threads. The Geekbench suite, conversely, appears to reward newer instruction sets and memory architecture more heavily. The Coffee Lake design's DDR4 support and modern memory controller give it an edge that raw core count cannot offset. The data shows that neither processor is uniformly superior; each leads decisively in the workloads that favor its design priorities.

The average benchmark scores tell a similar story of near-parity. The i7-3960X averages 2037 across all recorded tests, while the i5-8300H averages 2005. That is a difference of roughly 1.6%, statistically negligible. Both chips sit at the 45th percentile among all CPUs in the database. Their nearest rivals confirm the tight clustering: the i7-3960X sits within 0.2% of the AMD Opteron 6386 SE, the Intel Core i7-7700T, the AMD Ryzen 5 4500U, and the Intel Xeon E-2124G. The i5-8300H sits within 0.2% of the Intel Xeon D-1712TR, the Intel Core i5-8400H, the AMD Ryzen 7 2800H, and the Intel Core i5-8400T. Both chips occupy the same performance tier, just with very different win profiles.

FAQ

Q: Which processor wins more head-to-head benchmarks?

A: The Intel Core i7-3960X wins six of the eight head-to-head comparisons. The Intel Core i5-8300H wins the remaining two, both in the Geekbench suite.

Q: How large is the i7-3960X's advantage in Cinebench R23 multicore?

A: The i7-3960X scores 7170 versus 6245 for the i5-8300H, a 14.8% lead. The same 14.8% margin appears in R15 multicore (722 versus 629) and R20 multicore (3011 versus 2622).

Q: Where does the i5-8300H perform best relative to the i7-3960X?

A: The i5-8300H dominates Geekbench single-core, scoring 1286 versus 657, a 48.9% advantage. It also leads Geekbench multicore with 3920 versus 3193, an 18.5% margin.

Q: Do the two processors have similar overall benchmark averages?

A: Yes. The i7-3960X averages 2037 across all tests, while the i5-8300H averages 2005. Both sit at the 45th percentile among all CPUs in the database.

Q: Which processor has more cores and threads?

A: The i7-3960X has six cores and twelve threads. The i5-8300H has four cores and eight threads. The i7-3960X also has a larger shared L3 cache at 15 MB versus 12 MB.

Q: Are both processors still in production?

A: No. Both are listed as end-of-life. The i7-3960X was released in November 2011, and the i5-8300H in April 2018.

Architecture Differences

The two chips come from different eras of Intel design. The i7-3960X uses Sandy Bridge architecture, specifically the Sandy Bridge-E variant, built on a 32 nm process node. The i5-8300H uses Coffee Lake architecture, the Coffee Lake-H variant, built on a 14 nm process. The process shrink is substantial, and the database records confirm the physical consequences: the i7-3960X has a die size of 435 mm² and contains 2,270 million transistors, while the i5-8300H has a die size of just 126 mm² with no transistor count recorded. The newer chip packs its logic into roughly 29% of the physical area.

Core configuration differs as well. The i7-3960X offers six cores and twelve threads, while the i5-8300H offers four cores and eight threads. The i7-3960X carries 15 MB of shared L3 cache, the i5-8300H 12 MB. Both use 64 KB L1 and 256 KB L2 per core, so the per-core cache hierarchy is identical; the difference lies in core count and the shared L3 pool.

Memory architecture marks a clear generational split. The i7-3960X supports DDR3 memory over a quad-channel bus with a recorded bandwidth of 51.2 GB/s. The i5-8300H supports DDR4, though the database does not record its memory bus width or bandwidth. The i7-3960X also exposes PCIe Gen 3 with 40 lanes from the CPU, while the i5-8300H has no PCIe data recorded. Neither chip supports ECC memory.

The i7-3960X has no integrated graphics. The i5-8300H includes UHD 630 integrated graphics, making it a self-contained mobile solution. The i7-3960X targets desktop systems with a separate graphics card, while the i5-8300H is built for laptops where an iGPU is expected. The i7-3960X has an unlocked multiplier, the i5-8300H does not. The i7-3960X uses Intel Socket 2011; the i5-8300H uses Intel BGA 1440, a soldered mobile package. The i7-3960X launch MSRP was $990, the i5-8300H has no recorded launch price.

Specification Differences

The core count difference is the most consequential spec gap: 6 cores and 12 threads for the i7-3960X versus 4 cores and 8 threads for the i5-8300H. Base clocks differ too, with the i7-3960X at 3.30 GHz and the i5-8300H at 2.30 GHz. Both boost to 3.90 GHz, which explains why single-threaded Cinebench tests remain close in percentage terms despite the architectural gap.

Power consumption separates the two dramatically. The i7-3960X carries a 130 W TDP, the i5-8300H just 45 W. That 85 W difference reflects the desktop versus mobile positioning, and it also explains why the i7-3960X can sustain higher multicore throughput in Cinebench despite its older architecture. The i5-8300H achieves near-parity in average score while consuming roughly a third of the power budget.

Cache allocation differs in the shared L3 tier: 15 MB for the i7-3960X, 12 MB for the i5-8300H. Memory support differs as well, with DDR3 on the i7-3960X and DDR4 on the i5-8300H. The i7-3960X uses a quad-channel memory bus with 51.2 GB/s recorded bandwidth; the i5-8300H's memory bus details are unrecorded. The i7-3960X offers 40 PCIe Gen 3 lanes, the i5-8300H has no PCIe data recorded.

The i7-3960X includes no integrated graphics, while the i5-8300H includes UHD 630. The i7-3960X has an unlocked multiplier; the i5-8300H is locked. Socket types differ completely: Socket 2011 for the desktop part, BGA 1440 for the mobile part. Process nodes differ by generation: 32 nm for Sandy Bridge, 14 nm for Coffee Lake. Release dates are 2011 for the i7-3960X and 2018 for the i5-8300H. Both are end-of-life.

The Verdict

The data supports a clear division of use cases. Pick the Intel Core i7-3960X if the workload is heavily multithreaded rendering. Its Cinebench results are uniformly 14.8% to 15.9% ahead of the i5-8300H across R15, R20, and R23, in both single-core and multicore modes. The six-core, twelve-thread configuration with 15 MB of L3 cache delivers consistent rendering performance that the four-core mobile chip cannot match. The i7-3960X also offers quad-channel DDR3 memory with 51.2 GB/s bandwidth and 40 PCIe Gen 3 lanes, making it a more expandable desktop platform for systems that need sustained throughput.

Pick the Intel Core i5-8300H if the workload favors Geekbench-style short-burst performance or if power efficiency is a priority. Its Geekbench single-core score of 1286 is nearly double the i7-3960X's 657, and its multicore score of 3920 beats the i7-3960X by 18.5%. The 45 W TDP versus 130 W is a massive efficiency advantage, and the integrated UHD 630 graphics eliminate the need for a separate GPU in basic systems. The DDR4 memory support and newer Coffee Lake architecture give it modern platform features that the Sandy Bridge part lacks.

For users who need a rendering workhorse with upgrade potential, the i7-3960X wins on raw multicore muscle. For users who need a power-efficient mobile chip with strong short-burst performance and integrated graphics, the i5-8300H is the clear choice. The average benchmark scores are nearly identical, 2037 versus 2005, and both sit at the 45th percentile, so neither chip offers a universal performance advantage. The deciding factors are workload type, power budget, and platform requirements.