Intel Core i5-1345UE vs Intel Core i7-7740X Comparison

Head-to-Head Benchmarks

The benchmark data presents a clear sweep: the Intel Core i5-1345UE wins all six recorded Cinebench comparisons. The largest margin comes in Cinebench R20 single-core, where the i5-1345UE scores 553 against the i7-7740X's 488, a 13.3% advantage. Every other head-to-head test lands at a 13.1% delta, with the exception of R15 single-core at 12.8%. This consistency suggests a fundamental per-clock efficiency gap rather than a workload-specific quirk.

Multi-core results tell the same story. In Cinebench R23 multi-core, the i5-1345UE posts 9329 points versus 8250 for the i7-7740X, a 13.1% lead. The R20 multi-core run shows 3918 against 3465, again 13.1%. R15 multi-core follows at 940 versus 831, also 13.1%. The i5-1345UE's 10 cores and 12 threads outweigh the i7-7740X's 4 cores and 8 threads in sustained rendering, while simultaneously winning single-core tests.

The overall database average reinforces the pattern. The i5-1345UE averages 2698 across its benchmark suite, while the i7-7740X averages 2648. That is a modest 1.9% overall margin, but the head-to-head Cinebench deltas are far larger. The i7-7740X does have Geekbench results in the database (5246 multi-core, 1619 single-core) that are not part of the direct comparison set, but the Cinebench data alone is decisive.

Both processors sit at the 50th percentile in the overall CPU rankings, placing them in the middle of the database's recorded population. The i5-1345UE's nearest rivals include the Intel Core i7-8700T (2701, within 0.1%), the Intel Core i7-1185G7E (2703, within 0.2%), and the Intel Xeon E5-2640 v3 (2703, within 0.2%). The i7-7740X sits near the Intel Xeon E-2274G (2643, within 0.2%), the Intel Core i7-5820K (2642, within 0.2%), and the Intel Core i9-8950HK (2641, within 0.3%). These clusters show that neither chip is an outlier in its performance class; rather, the head-to-head gap reflects a generational shift within a similar overall tier.

The Verdict

The data points to one clear conclusion: the Intel Core i5-1345UE is the faster processor in every measured Cinebench workload. It wins all six direct comparisons with deltas between 12.8% and 13.3%. For buyers choosing strictly on benchmark performance in rendering workloads, the i5-1345UE is the unambiguous pick.

The i7-7740X still has a role. It is a desktop part with a 112 W TDP, a 4.3 GHz base clock, and an unlocked multiplier, which means it targets a different system category entirely. The i5-1345UE is a 15 W mobile processor on Intel BGA 1744. If the application demands a socketed desktop platform with overclocking support, the i7-7740X is the only one of the two that fits. But if raw Cinebench scores matter more than platform flexibility, the i5-1345UE wins outright.

The average benchmark scores align with the head-to-head results, though the overall margin is smaller. The i5-1345UE's 2698 average versus the i7-7740X's 2648 means the i7-7740X is not far behind in the broader database, but the direct comparisons show a consistent 13% Cinebench deficit. A user upgrading from an older high-end desktop chip to a modern mobile part would see measurable gains in these tests.

Architecture Differences

The two processors come from different design generations and target different market segments. The i5-1345UE uses Raptor Lake architecture on Intel's 10 nm process, built for mobile platforms with a 15 W TDP. The i7-7740X uses Kaby Lake architecture on Intel's 14 nm process, designed for desktop systems with a 112 W TDP. The process node difference alone explains part of the efficiency gap: the newer 10 nm part delivers higher performance per watt, as reflected in the 15 W versus 112 W TDP figures.

Core and thread counts differ sharply. The i5-1345UE has 10 cores and 12 threads; the i7-7740X has 4 cores and 8 threads. The i5-1345UE also carries a larger L3 cache at 12 MB shared, versus 8 MB shared for the i7-7740X. Per-core L1 and L2 caches also differ: the i5-1345UE has 80 KB L1 and 1.25 MB L2 per core, while the i7-7740X has 64 KB L1 and 256 KB L2 per core. The i5-1345UE's larger per-core L2 is notable for workloads that benefit from private cache.

Integrated graphics separate the two as well. The i5-1345UE includes Iris Xe Graphics 80EU; the i7-7740X has no integrated graphics at all, requiring a discrete GPU. Memory support differs: the i5-1345UE accepts DDR4 and DDR5 in dual-channel configuration, while the i7-7740X accepts only DDR4 but in quad-channel configuration. PCIe connectivity also diverges: the i5-1345UE offers Gen 4 with 8 lanes (CPU only), while the i7-7740X offers Gen 3 without a lane count listed in the database.

The i7-7740X has an unlocked multiplier; the i5-1345UE does not. The i5-1345UE was released on 2023-01-03, the i7-7740X on 2017-06-25. Both remain in active production according to the database. Neither supports ECC memory.

FAQ

Q: Which processor has more cores and threads?

A: The Intel Core i5-1345UE has 10 cores and 12 threads, while the Intel Core i7-7740X has 4 cores and 8 threads.

Q: How much faster is the i5-1345UE in multi-core rendering?

A: In Cinebench R23 multi-core, the i5-1345UE scores 9329 versus 8250 for the i7-7740X, a 13.1% advantage. The R20 and R15 multi-core tests show the same 13.1% delta.

Q: Does the i7-7740X have integrated graphics?

A: No. The i7-7740X has no integrated graphics, while the i5-1345UE includes Iris Xe Graphics 80EU.

Q: Can the i7-7740X be overclocked?

A: Yes, the i7-7740X has an unlocked multiplier. The i5-1345UE does not.

Q: Which memory types does each processor support?

A: The i5-1345UE supports DDR4 and DDR5 in dual-channel mode. The i7-7740X supports only DDR4 but in quad-channel mode.

Q: What is the TDP difference?

A: The i5-1345UE has a 15 W TDP, while the i7-7740X has a 112 W TDP.

Where Each One Wins

The i5-1345UE wins every recorded Cinebench comparison. Single-core tests show a 12.8% to 13.3% lead across R15, R20, and R23, which indicates a per-thread advantage in lightly threaded workloads. Multi-core tests show a consistent 13.1% lead, driven by the combination of more cores and higher per-core efficiency. For rendering, video encoding, or any CPU-bound productivity task measured by Cinebench, the i5-1345UE is the stronger choice.

The i7-7740X does not win any direct benchmark comparison, but it has attributes that matter outside Cinebench. It is a desktop processor with a 112 W TDP, which allows sustained operation in a larger cooling envelope. It has an unlocked multiplier for overclocking, a quad-channel DDR4 memory bus, and a Socket 2066 platform. If the workload depends on memory bandwidth scaling across four channels or on manual tuning, the i7-7740X platform offers capabilities the mobile i5-1345UE cannot match. The i5-1345UE's PCIe Gen 4 with 8 CPU lanes is newer, but the i7-7740X's Gen 3 support may be sufficient for older expansion cards.

The average benchmark scores place the two chips close together overall: 2698 for the i5-1345UE versus 2648 for the i7-7740X. That narrow overall gap, despite the larger Cinebench deltas, suggests the i7-7740X holds up in other measured workloads not included in the head-to-head set, such as the Geekbench results recorded for it.

Specification Differences

The two processors differ in nearly every specification category. The i5-1345UE uses Raptor Lake on a 10 nm process; the i7-7740X uses Kaby Lake on a 14 nm process. Core counts are 10 versus 4, threads 12 versus 8. Base clocks are 1400 MHz for the i5-1345UE and 4300 MHz for the i7-7740X, though both boost to 4600 MHz. TDP is 15 W versus 112 W.

Cache hierarchies differ per core and at the shared level. The i5-1345UE has 80 KB L1 and 1.25 MB L2 per core, with 12 MB shared L3. The i7-7740X has 64 KB L1 and 256 KB L2 per core, with 8 MB shared L3. Memory support: the i5-1345UE takes DDR4 and DDR5 in dual-channel; the i7-7740X takes only DDR4 in quad-channel. PCIe: the i5-1345UE provides Gen 4 with 8 lanes (CPU only); the i7-7740X provides Gen 3.

Sockets differ completely: Intel BGA 1744 for the i5-1345UE, Intel Socket 2066 for the i7-7740X. Integrated graphics are present only on the i5-1345UE (Iris Xe Graphics 80EU). The i7-7740X has an unlocked multiplier; the i5-1345UE does not. Market segments are mobile versus desktop. Release dates are 2023-01-03 and 2017-06-25. Both are listed as active in production, and neither supports ECC memory.