Intel Core i5-2500T vs Intel Core i7-3540M Comparison

The Intel Core i7-3540M and Intel Core i5-2500T occupy the same 23rd percentile in the benchmark database, with average scores of 867 and 856 respectively, yet they approach that performance level from opposite directions: the i7-3540M is a 35W mobile chip with two cores and four threads, while the i5-2500T is a 45W desktop chip with four physical cores and no hyper-threading. The data reveals a consistent, narrow advantage for the mobile part across every Cinebench test, with deltas ranging from 1.4% to 1.6%, suggesting that architectural efficiency from the newer 22nm Ivy Bridge process outweighs the raw core-count advantage of the older 32nm Sandy Bridge desktop part.

FAQ

Q: Which processor has the higher multi-core performance?

A: The Intel Core i7-3540M wins all four multi-core Cinebench tests, scoring 254 vs 250 in R15, 1060 vs 1045 in R20, and 2525 vs 2489 in R23, with a 1.6% margin in R15 and 1.4% margins in the other two.

Q: How do the single-core scores compare?

A: The i7-3540M edges out the i5-2500T in both single-core tests, posting 149 vs 147 in Cinebench R20 and 356 vs 351 in Cinebench R23, each a 1.4% advantage.

Q: What is the difference in core and thread counts?

A: The i7-3540M has 2 cores and 4 threads, while the i5-2500T has 4 cores and 4 threads. The i5 has double the physical cores but lacks hyper-threading, while the i7 uses hyper-threading to reach four threads from two cores.

Q: How do their thermal design power (TDP) ratings differ?

A: The i7-3540M is rated at 35W, which is 10W lower than the i5-2500T's 45W rating, making the mobile chip more power-efficient despite delivering slightly higher benchmark scores.

Q: What are the clock speed differences between the two?

A: The i7-3540M has a base clock of 3.00 GHz and a boost clock of 3.70 GHz, while the i5-2500T has a base clock of 2.30 GHz and a boost clock of 3.30 GHz, giving the i7 a 700 MHz base and 400 MHz boost advantage.

Q: Which processor has the larger L3 cache?

A: The i5-2500T has 6 MB of shared L3 cache, while the i7-3540M has 4 MB of shared L3 cache, giving the desktop part a 2 MB advantage in cache capacity.

The Verdict

The data points to a clear, if modest, winner: the Intel Core i7-3540M takes all five head-to-head benchmark comparisons, sweeping the multi-core and single-core Cinebench tests with margins between 1.4% and 1.6%. For users prioritizing raw performance in the specific workloads represented by Cinebench R15, R20, and R23, the i7-3540M is the better choice, despite having half the physical cores of its rival. This makes sense when considering the clock speed gap—the i7 runs at 3.00 GHz base and 3.70 GHz boost versus the i5's 2.30 GHz base and 3.30 GHz boost—and the newer 22nm Ivy Bridge architecture, which likely compensates for the core deficit.

The i5-2500T, however, is not without merit. It offers four physical cores, a 6 MB L3 cache, and a larger die size of 216 mm² compared to 118 mm², which could translate to better multitasking in workloads that scale with core count, even if the Cinebench results don't reflect that advantage. Its 45W TDP and desktop Socket 1155 platform also suggest it was designed for always-plugged-in systems, whereas the i7-3540M's 35W TDP and mobile Socket G2 (988B) target laptops. The production status of the i5-2500T is marked as "End-of-life," which may factor into availability considerations, but the benchmark data shows it trails the i7 in every measured metric. Given the consistent, albeit small, performance lead and superior efficiency, the i7-3540M is the recommended pick for anyone choosing between these two based on the available benchmark information.

Head-to-Head Benchmarks

The i7-3540M's sweep of the head-to-head tests is notable for its consistency. In Cinebench R15 multi-core, the i7 scores 254 against the i5's 250, a 1.6% delta—the largest margin in any test. The other four comparisons are all identical at 1.4%: Cinebench R20 multi-core (1060 vs 1045), Cinebench R20 single-core (149 vs 147), Cinebench R23 multi-core (2525 vs 2489), and Cinebench R23 single-core (356 vs 351). The uniformity of these deltas suggests a systematic advantage rather than a workload-specific quirk; the i7 is simply faster across the board.

The single-core results are particularly telling. The i7's 149 in R20 and 356 in R23 versus the i5's 147 and 351 demonstrate that the mobile chip's higher boost clock of 3.70 GHz versus 3.30 GHz translates directly into better per-thread performance. This is a critical finding because single-core performance often dictates responsiveness in everyday applications, and the i7's 1.4% lead here mirrors its multi-core advantage, indicating that the i5's extra two cores do not compensate for its lower clock speeds and older architecture.

Interestingly, the i5-2500T's Geekbench scores are not listed in the head-to-head data, but its average benchmark score of 856 versus the i7's 867 tells a similar story—a roughly 1.3% gap. The i7's nearest rivals include the Intel Xeon X3460 (avg 866, delta 0.1%) and Intel Core i5-3470T (avg 863, delta 0.4%), while the i5-2500T sits close to the Intel Core i5-5250U (avg 856, delta 0.1%) and Intel Core i7-4500U (avg 859, delta -0.4%). These proximity values reinforce that both chips occupy a similar performance tier, but the i7 consistently sits at the upper edge of that tier.

Specification Differences

The most obvious divergence is core and thread counts: the i7-3540M has 2 cores and 4 threads, while the i5-2500T has 4 cores and 4 threads. This means the i5 has twice as many physical cores but the same thread count, relying on raw core count while the i7 uses hyper-threading. Clock speeds also favor the i7, with a 3.00 GHz base and 3.70 GHz boost versus the i5's 2.30 GHz base and 3.30 GHz boost—a 700 MHz base gap and 400 MHz boost gap.

Thermal design power separates the two by 10W: the i7 is rated at 35W, the i5 at 45W. The sockets are incompatible, with the i7 using Intel Socket G2 (988B) for mobile platforms and the i5 using Intel Socket 1155 for desktops. The i5-2500T includes PCIe Gen 3 with 16 lanes (CPU only), a feature not listed for the i7. The i5 also has a larger L3 cache at 6 MB shared versus the i7's 4 MB shared, and a substantially larger die size at 216 mm² versus 118 mm², with a transistor count of 1,160 million (the i7's transistor count is not provided). The i5's production status is "End-of-life," while the i7's is not specified. Release dates differ by roughly two years, with the i5 launching in January 2011 and the i7 in January 2013. Both support DDR3 memory in dual-channel mode, neither supports ECC memory, and both are multiplier-unlocked false with integrated graphics—Intel HD 2000 for the i5 and Intel HD 4000 for the i7.

Architecture Differences

The i7-3540M is built on Ivy Bridge architecture using a 22nm process node, while the i5-2500T uses Sandy Bridge on a 32nm node. This process shrink is significant: the i7's die size is 118 mm², nearly half the i5's 216 mm², and it manages this with fewer transistors (the i7's count is not listed, but the i5's is 1,160 million). The newer 22nm node likely contributes to the i7's lower 35W TDP despite higher clock speeds, as smaller transistors generally require less power to switch.

The integrated graphics also differ by generation: the i7 features Intel HD 4000, while the i5 has Intel HD 2000. The i7's memory support is listed as DDR3 with dual-channel bus, matching the i5's DDR3 dual-channel configuration, so memory bandwidth is not a differentiating factor in the data. The i5's PCIe Gen 3 support with 16 lanes is a notable advantage, as the i7's PCIe configuration is not specified, but this is a platform-level feature rather than a core architectural difference. The L3 cache sizes differ, with the i5 offering 6 MB versus the i7's 4 MB, but the i7's smaller cache and fewer cores still manage to outperform the i5 in all benchmarks, pointing to architectural efficiency gains in Ivy Bridge over Sandy Bridge.

Where Each One Wins

The i7-3540M wins in every measured benchmark category, making it the stronger choice for pure compute performance, particularly in single-threaded tasks where its 3.70 GHz boost clock and Ivy Bridge architecture shine. Its 35W TDP also makes it the better option for thermally constrained environments, such as thin-and-light laptops, where the lower power draw is an advantage. Users running Cinebench-style workloads—rendering, 3D modeling, or CPU-intensive calculations—will see slightly better results with the i7, as evidenced by its 2525 vs 2489 R23 multi-core score.

The i5-2500T, while losing all head-to-head tests, still has theoretical advantages that could matter in specific scenarios. Its four physical cores could handle multi-threaded workloads that don't rely on hyper-threading efficiency, and its 6 MB L3 cache is 50% larger than the i7's 4 MB, which might benefit cache-sensitive applications not represented in the Cinebench suite. The i5's desktop socket and PCIe Gen 3 support with 16 lanes make it more suitable for building or upgrading a desktop system with discrete graphics, whereas the i7 is locked to mobile platforms. The i5's larger die size and transistor count suggest a more complex design that might offer better raw multi-core throughput in unmeasured workloads, but based on the data available, the i7-3540M is the clear winner for anyone prioritizing benchmark performance.