Intel Core i3-1215U vs Intel Core i7-7700 Comparison

FAQ

Q: Which processor has more cores and threads?

A: The Intel Core i3-1215U has 6 cores and 8 threads, while the Intel Core i7-7700 has 4 cores and 8 threads. Despite having two fewer cores, the i7-7700 matches the thread count because every core supports two threads.

Q: What is the difference in process node between the two chips?

A: The Intel Core i3-1215U is built on a 10 nm process, while the Intel Core i7-7700 uses a 14 nm process. The newer node allows the i3-1215U to operate at a 15 W TDP, compared to the i7-7700's 65 W TDP.

Q: Which CPU has a higher boost clock?

A: The Intel Core i3-1215U has a boost clock of 4.40 GHz, which is higher than the Intel Core i7-7700's boost clock of 4.20 GHz. The i7-7700, however, has a much higher base clock: 3.60 GHz versus 1.20 GHz.

Q: How do the two compare in Geekbench single-core performance?

A: The Intel Core i3-1215U scores 1485 in Geekbench single-core, which is 8.5% ahead of the Intel Core i7-7700's score of 1369. This indicates the newer architecture has a single-thread advantage.

Q: Which chip wins in Cinebench R23 multi-core?

A: The Intel Core i7-7700 scores 7344 in Cinebench R23 multi-core, beating the Intel Core i3-1215U's 6644 by 9.5%. The older desktop chip maintains a lead in this heavily threaded workload.

Q: What about memory support differences?

A: The Intel Core i3-1215U supports both DDR4 and DDR5 memory, while the Intel Core i7-7700 only supports DDR4. Both use dual-channel memory buses, and the i7-7700 has a recorded memory bandwidth of 38.4 GB/s.

Architecture Differences

The two processors come from different architectural eras and are designed for different market segments. The Intel Core i3-1215U belongs to the Alder Lake-U family, a mobile-focused line built on a 10 nm process. The Intel Core i7-7700 is a Kaby Lake desktop part manufactured on a 14 nm node. That process gap is a major factor in the power envelope: the i3-1215U is rated at 15 W TDP, while the i7-7700 draws 65 W TDP.

The physical configurations diverge significantly. The i3-1215U packs 6 cores and 8 threads, whereas the i7-7700 has 4 cores and 8 threads. This means the i7-7700 relies on Hyper-Threading across all cores, while the i3-1215U uses a hybrid arrangement where two of its cores are likely efficiency-oriented, given the lower base clock of 1.20 GHz versus the i7-7700's 3.60 GHz. The boost clocks are closer: 4.40 GHz for the i3-1215U and 4.20 GHz for the i7-7700.

Cache hierarchies also differ. The i3-1215U provides 80 KB of L1 cache per core and 1.25 MB of L2 per core, with a shared 10 MB L3. The i7-7700 offers 64 KB L1 per core, 256 KB L2 per core, and a shared 8 MB L3. In raw capacity, the i3-1215U has more L2 and L3 cache, which can help with data-heavy workloads.

Platform support separates the two further. The i3-1215U uses the Intel BGA 1744 socket and supports PCIe Gen 4 with 20 lanes (CPU only). The i7-7700 uses the older Intel Socket 1151 and PCIe Gen 3 with 16 lanes. Memory support is another differentiator: the i3-1215U accepts DDR4 and DDR5, while the i7-7700 is limited to DDR4. The i7-7700 has a listed memory bandwidth of 38.4 GB/s, a figure not recorded for the i3-1215U.

Integrated graphics differ as well. The i3-1215U comes with UHD Graphics 64EU, while the i7-7700 has HD 630. Neither chip has an unlocked multiplier, and both are still marked as Active in production status. The release dates reflect the generational gap: the i7-7700 launched in January 2017, and the i3-1215U arrived in February 2022.

The Verdict

The data points to a split decision based on workload type. The Intel Core i7-7700 wins the majority of head-to-head benchmarks, taking 11 of 19 tests. Its victories are concentrated in Cinebench and Geekbench multi-core tests, where it leads by roughly 5 to 10 percent. It also wins in data compression, extended instructions, and random string sorting. For users running rendering workloads, compression tasks, or legacy instruction-heavy software, the i7-7700 is the stronger performer.

The Intel Core i3-1215U, however, wins 8 of 19 tests, and its wins are often by larger margins. It dominates in floating-point math, integer math, data encryption, and single-thread Passmark scores. The i3-1215U also leads in Geekbench single-core by 8.5%. If the workload involves encryption, math processing, or lightly threaded tasks, the i3-1215U is the better choice.

The power profile is decisive for mobile use. The i3-1215U is a 15 W mobile chip with a BGA socket, while the i7-7700 is a 65 W desktop chip. The i3-1215U's lower TDP and support for DDR5 make it the more modern, efficient option for laptops and compact systems. The i7-7700's higher TDP and older platform limit its appeal to existing desktop builds. Users with a Socket 1151 motherboard and a need for multi-core rendering should stick with the i7-7700. Users prioritizing portability, encryption speed, or math throughput should choose the i3-1215U.

Specification Differences

The two CPUs diverge on nearly every core specification. The i3-1215U has 6 cores, while the i7-7700 has 4. Both have 8 threads. Base clocks differ sharply: 1.20 GHz for the i3-1215U versus 3.60 GHz for the i7-7700. Boost clocks are closer, 4.40 GHz versus 4.20 GHz, favoring the i3-1215U.

The process node is 10 nm for the i3-1215U and 14 nm for the i7-7700. TDP is 15 W versus 65 W. The sockets are incompatible: Intel BGA 1744 for the i3-1215U, Intel Socket 1151 for the i7-7700. Architecture names are Alder Lake-U and Kaby Lake, respectively.

Cache layouts differ per core: L1 is 80 KB for the i3-1215U versus 64 KB for the i7-7700, L2 is 1.25 MB versus 256 KB, and L3 is 10 MB shared versus 8 MB shared. Memory support is DDR4/DDR5 for the i3-1215U and DDR4 only for the i7-7700. The i7-7700 has a listed memory bandwidth of 38.4 GB/s, which the i3-1215U lacks. PCIe support is Gen 4 with 20 lanes versus Gen 3 with 16 lanes. Integrated graphics are UHD Graphics 64EU versus HD 630. The market segment is Mobile for the i3-1215U and Desktop for the i7-7700. The i3-1215U was released in February 2022, while the i7-7700 was released in January 2017.

Head-to-Head Benchmarks

The Intel Core i7-7700 establishes an early lead in Cinebench tests. In Cinebench R15 multi-core, it scores 740 against the i3-1215U's 669, a 9.6% margin. The single-core R15 test shows a similar gap: 104 versus 94, also 9.6%. Cinebench R20 multi-core sees the i7-7700 at 3084 versus 2790, a 9.5% lead, and the single-core result is 435 versus 393, a 9.7% edge. Cinebench R23 multi-core continues the pattern, 7344 versus 6644, a 9.5% difference, while the single-core result is 1036 versus 938, another 9.5%.

Geekbench splits the two. The i7-7700 wins multi-core with 4640 against 4365, a 5.9% lead. But the i3-1215U takes single-core with 1485 versus 1369, an 8.5% advantage. That single-core win is the first notable reversal.

Passmark tests reveal the i3-1215U's strengths. In data encryption, the i3-1215U scores 7041 versus 2974, a massive 136.8% lead. Floating-point math goes to the i3-1215U, 25379 versus 16904, a 50.1% margin. Integer math favors the i3-1215U, 35534 versus 27538, a 29% lead. The i3-1215U also wins Passmark multi-thread, 10472 versus 8635, a 21.3% difference, and find prime numbers, 32 versus 28, a 14.3% edge. Passmark single-thread is another i3-1215U win, 3218 versus 2442, a 31.8% margin.

The i7-7700 fights back in other Passmark tests. Data compression goes to the i7-7700, 122429 versus 116705, a 4.7% lead. Extended instructions favor the i7-7700, 8128 versus 6868, a 15.5% margin. Random string sorting is a clear i7-7700 win, 15509 versus 13046, a 15.9% difference. Physics is nearly tied, with the i7-7700 at 588 and the i3-1215U at 583, a 0.9% gap.

Where Each One Wins

The Intel Core i7-7700 is the choice for traditional multi-core rendering and compression tasks. It wins all three Cinebench multi-core tests, with leads between 9.5% and 9.6%. It also wins Geekbench multi-core by 5.9%, data compression by 4.7%, extended instructions by 15.5%, random string sorting by 15.9%, and physics by a slim 0.9%. This makes it suitable for users running Cinebench-based workflows, file compression, or applications that rely on older instruction sets. Its higher base clock of 3.60 GHz likely contributes to these wins, as does its desktop-class 65 W power budget.

The Intel Core i3-1215U excels in math and encryption workloads. Its 136.8% lead in data encryption is the largest margin in the comparison. Floating-point math is 50.1% higher, and integer math is 29% higher. The i3-1215U also wins Passmark multi-thread by 21.3% and find prime numbers by 14.3%. Single-thread performance is a standout: a 31.8% lead in Passmark single-thread and an 8.5% lead in Geekbench single-core. These results make the i3-1215U the better option for encryption, scientific computing, or any workload that stresses arithmetic units.

The use-case split is clear. The i7-7700 suits desktop users who need rendering power, compression speed, and compatibility with older software. The i3-1215U suits mobile users and those who prioritize single-thread responsiveness, encryption, and math-heavy tasks. The overall win count favors the i7-7700, 11 to 8, but the average benchmark score tells a different story: the i3-1215U averages 12604, while the i7-7700 averages 11914. Both sit at the 67th percentile among all CPUs, but the i3-1215U's higher average reflects its stronger performance in the workloads it wins.