Intel Core i3-1305U vs Intel Core i7-7700 Comparison

Where Each One Wins

The recorded data splits these two processors along clear lines. The Intel Core i7-7700 takes 10 benchmark wins, while the Intel Core i3-1305U takes 7. The nature of those wins tells the real story: the i7-7700 dominates in compression, sorting, extended instruction workloads, and every Cinebench test, while the i3-1305U counters in encryption, prime number finding, floating point math, integer math, and raw single-threaded performance.

For content creation and legacy desktop workloads, the i7-7700 is the stronger choice. Its Cinebench R23 multi-core score of 7344 beats the i3-1305U's 7183, a 2.2% margin. The single-core Cinebench R23 result also favors the i7-7700 at 1036 versus 1014, again a 2.2% advantage. These are narrow wins, but they are consistent across every Cinebench version in the database: R15 multi-core 740 versus 723 (2.4% ahead), R15 single-core 104 versus 102 (2%), R20 multi-core 3084 versus 3016 (2.3%), and R20 single-core 435 versus 425 (2.4%). If a workload relies on the Cinebench rendering pipeline, the i7-7700 holds a small but repeatable edge.

The i7-7700's largest victories come in data compression and string sorting. In PassMark data compression, it scores 122429 against 92767, a 32% lead. Random string sorting shows a 42.4% advantage, 15509 versus 10889. Extended instruction throughput is also heavily lopsided: 8128 versus 5240, a 55.1% gap. The physics test adds another win at 588 versus 523, a 12.4% margin.

The i3-1305U's wins are concentrated in math-heavy and single-threaded tasks. Its PassMark single-thread score of 3115 crushes the i7-7700's 2442, a 21.6% advantage. Data encryption is its standout: 5895 versus 2974, meaning the i7-7700 trails by 49.6% (the delta is expressed as -49.6% from the i7's perspective). Floating point math favors the i3-1305U at 19687 versus 16904, a 14.1% lead. Prime number finding goes to the i3-1305U at 36 versus 28, a 22.2% edge. Integer math is nearly tied but still a win for the i3-1305U: 27925 versus 27538, only 1.4% ahead. The PassMark multi-thread score also slightly favors the i3-1305U at 8747 versus 8635, a 1.3% margin.

Architecture Differences

The two CPUs come from different eras and different design philosophies. The i7-7700 is a Kaby Lake desktop part, built on Intel's 14 nm process with 4 cores and 8 threads. It runs at a base clock of 3.60 GHz and boosts to 4.20 GHz, with a 65 W TDP. It uses the Intel Socket 1151 and supports DDR4 memory over a dual-channel bus with 38.4 GB/s of bandwidth. Its cache layout is 64 KB of L1 per core, 256 KB of L2 per core, and 8 MB of shared L3. The integrated graphics are HD 630, and it provides PCIe Gen 3 with 16 CPU lanes. It launched in early 2017.

The i3-1305U is a Raptor Lake-U mobile processor, built on Intel's 10 nm process with 5 cores and 6 threads. It has a base clock of 1600.00 MHz (1.60 GHz) and a boost clock of 4.50 GHz, with a TDP of just 15 W. It uses the Intel BGA 1744 socket and supports both DDR4 and DDR5 memory over a dual-channel bus; the database does not record a memory bandwidth figure for it. Its cache structure is larger per core: 80 KB of L1 per core, 1.25 MB of L2 per core, and 10 MB of shared L3. The integrated graphics are UHD Graphics 64EU, and PCIe connectivity is Gen 4 with 8 CPU lanes. It launched in early 2023.

The core count difference matters. The i7-7700 has fewer physical cores (4 versus 5) but more threads (8 versus 6) thanks to Hyper-Threading on all cores. The i3-1305U's 5 cores with 6 threads suggests a hybrid arrangement where one core lacks Hyper-Threading, which explains its higher single-thread boost at 4.50 GHz versus the i7-7700's 4.20 GHz. The newer 10 nm process and newer architecture give the i3-1305U a clock speed advantage in single-threaded bursts, and the larger L3 cache (10 MB versus 8 MB) helps in cache-sensitive workloads.

Neither processor supports ECC memory. Neither has an unlocked multiplier. The i7-7700 is a desktop part with a 65 W TDP and 16 PCIe Gen 3 lanes; the i3-1305U is a mobile part with a 15 W TDP and 8 PCIe Gen 4 lanes. The i3-1305U's launch MSRP is $309.

The Verdict

The database points to a clear split based on workload type. Choose the Intel Core i7-7700 for rendering, compression, sorting, extended instruction throughput, and physics simulations. Its Cinebench wins are consistent though small, and its data compression and string sorting advantages are massive (32% and 42.4% respectively). The 55.1% lead in extended instructions makes it the better choice for workloads that leverage SIMD or specialized instruction sets. Its 67th percentile ranking among all CPUs, with an average benchmark score of 11914, places it just above the i3-1305U's 66th percentile and 11200 average.

Choose the Intel Core i3-1305U for single-threaded responsiveness, encryption, and floating-point math. Its 21.6% single-thread lead is substantial, and its encryption score is nearly double that of the i7-7700. The 14.1% floating point advantage and 22.2% prime number edge make it the better fit for numerical workloads that scale with clock speed rather than core count. The 15 W TDP also makes it the only sensible choice for mobile platforms.

The overall average benchmark score favors the i7-7700: 11914 versus 11200, a difference of roughly 6.4%. The rival comparisons reinforce this. The i7-7700 sits within 0.9% of the AMD Ryzen 5 3500X, Intel Xeon Bronze 3408U, and Intel Xeon Gold 6314U, and matches the AMD EPYC 7453 exactly. The i3-1305U sits within 0.7% of the AMD EPYC 7452 and within 0.4% of the AMD EPYC 7542, while edging out the Intel Xeon Gold 6336Y by 0.1% and the AMD Ryzen 5 3500U by 0.2%. The i7-7700 competes in a higher performance tier overall.

FAQ

Q: Which CPU has more cores and threads?

A: The i3-1305U has 5 cores and 6 threads. The i7-7700 has 4 cores and 8 threads.

Q: Which processor is faster in single-threaded benchmarks?

A: The i3-1305U wins PassMark single-thread with 3115 versus 2442, a 21.6% lead. However, the i7-7700 wins every Cinebench single-core test, including R23 at 1036 versus 1014.

Q: How do the two compare in multi-core rendering?

A: The i7-7700 wins all three Cinebench multi-core tests: R15 740 versus 723, R20 3084 versus 3016, and R23 7344 versus 7183. Margins range from 2.2% to 2.4%. The i3-1305U wins PassMark multi-thread at 8747 versus 8635.

Q: Which CPU is better for encryption workloads?

A: The i3-1305U is far ahead. Its PassMark data encryption score is 5895 versus 2974 for the i7-7700, a 49.6% advantage from the i7's perspective.

Q: What are the TDP differences?

A: The i7-7700 has a 65 W TDP and is a desktop part. The i3-1305U has a 15 W TDP and is a mobile part.

Q: Which processor supports faster PCIe?

A: The i3-1305U supports PCIe Gen 4 with 8 CPU lanes. The i7-7700 supports PCIe Gen 3 with 16 CPU lanes.

Q: What memory types does each support?

A: The i7-7700 supports DDR4 only. The i3-1305U supports both DDR4 and DDR5.

Head-to-Head Benchmarks

The head-to-head table reveals where each processor earns its keep. Starting with the i7-7700's wins, the most dramatic is PassMark data compression. At 122429 versus 92767, the i7-7700 is 32% ahead. This is a workload that benefits from the i7-7700's 8 threads and desktop-oriented design. Random string sorting is even more lopsided: 15509 versus 10889, a 42.4% margin. Extended instructions show the largest gap of all, 8128 versus 5240, a 55.1% lead. These three tests alone suggest the i7-7700 is substantially better at data manipulation and specialized instruction execution.

The physics test goes to the i7-7700 at 588 versus 523, a 12.4% win. This is notable because physics simulations often scale with thread count, and the i7-7700's 8 threads outperform the i3-1305U's 6 threads here. The Cinebench suite, as noted, is a clean sweep for the i7-7700 across all six tests (R15, R20, R23, each in multi-core and single-core), with deltas between 2% and 2.4%. These are not large margins, but they are consistent, indicating a small architectural advantage in rendering workloads.

Now the i3-1305U's wins. PassMark data encryption is the standout: 5895 versus 2974. The delta of -49.6% means the i7-7700 scores less than half of the i3-1305U's result. This is likely due to newer AES instruction support on the Raptor Lake architecture. Floating point math also favors the i3-1305U at 19687 versus 16904, a 14.1% edge. Prime number finding shows a 22.2% advantage for the i3-1305U (36 versus 28), a test that rewards raw clock speed and efficient integer division.

Integer math is nearly a tie but goes to the i3-1305U: 27925 versus 27538, only 1.4% apart. PassMark multi-thread also goes to the i3-1305U at 8747 versus 8635, a 1.3% margin, which is surprising given the i7-7700's higher thread count but consistent with the i3-1305U's higher boost clock and newer architecture. Finally, single-thread performance is a clear i3-1305U win at 3115 versus 2442, a 21.6% lead. This is the largest single-thread gap in the entire comparison and explains why the i3-1305U excels in lightly threaded tasks.

The overall picture is one of complementary strengths. The i7-7700 wins in throughput-oriented tasks like compression, sorting, and extended instructions, while the i3-1305U wins in latency-sensitive tasks like encryption, floating point math, and single-threaded execution. The i7-7700's 10 wins versus the i3-1305U's 7 wins, combined with a higher average benchmark score (11914 versus 11200), makes it the stronger overall processor in the database, but the i3-1305U's specific advantages in encryption and single-thread performance are too large to ignore for those workloads.