Intel Core i5-2500S vs Intel Core i7-2920XM Comparison

The Intel Core i5-2500S and Intel Core i7-2920XM are both 32nm Sandy Bridge parts from the same era, but they were engineered for entirely different environments. The i5-2500S is a desktop processor with a 65W TDP, while the i7-2920XM is a mobile Extreme Edition chip with a 55W TDP. Despite the i7’s lower thermal envelope, it wins the majority of the head-to-head benchmarks, yet the i5-2500S scores decisive victories in Geekbench tests, making the choice between them heavily dependent on the specific workload.

Where Each One Wins

The benchmark split between these two CPUs is starkly defined by the test suite. The Intel Core i7-2920XM dominates every Cinebench iteration, showcasing its strength in sustained, multi-threaded rendering workloads. In Cinebench R23 multi-core, the i7 scores 3504 versus the i5-2500S’s 2867, a lead of 18.2%. This pattern repeats in Cinebench R15, R20, and R23, with the i7 consistently holding an 18.2% to 18.4% advantage in both single-core and multi-core tests. The i7 also wins Cinebench R20 single-core with 207 points against the i5’s 169.

The Intel Core i5-2500S, conversely, claims victory in the Geekbench suite. It scores 1511 in Geekbench multi-core, beating the i7-2920XM’s 1452 by 4.1%. More dramatically, the i5 wins Geekbench single-core with a score of 582 versus the i7’s 430, a massive 35.3% margin. This suggests that for legacy single-threaded workloads or specific integer-heavy operations measured by Geekbench, the desktop i5 has a fundamental advantage that the mobile i7 cannot overcome, despite its higher clock speeds.

Architecture Differences

Both processors share the same Sandy Bridge architecture, manufactured on Intel’s 32nm process node with 1,160 million transistors and a 216 mm² die size. The foundational design is identical, but the configurations diverge significantly. The i5-2500S has 4 cores and 4 threads, lacking Hyper-Threading, while the i7-2920XM offers 4 cores and 8 threads, doubling the logical processing capacity. This thread advantage is the primary driver behind the i7’s Cinebench wins, as those benchmarks scale well with additional threads.

Cache allocation is another key difference. The i5-2500S features 6 MB of shared L3 cache, while the i7-2920XM is equipped with 8 MB of shared L3 cache. Both have 64 KB L1 and 256 KB L2 per core. The i7’s larger L3 cache, combined with its extra threads, provides a more robust foundation for complex, multi-threaded datasets. The i5 compensates with a higher base clock of 2.70 GHz and boost clock of 3.70 GHz, compared to the i7’s 2.50 GHz base and 3.50 GHz boost, which explains its single-thread performance superiority in Geekbench.

The integrated graphics differ as well: the i5-2500S carries Intel HD 2000, while the i7-2920XM features Intel HD 3000. Memory support is identical in type (DDR3) and bus width (dual-channel), but the i7 explicitly lists a memory bandwidth of 25.6 GB/s. The i5-2500S is a desktop part on Intel Socket 1155, whereas the i7-2920XM is a mobile processor on Intel Socket G2 (988B). The i7 also has an unlocked multiplier, making it overclockable, while the i5-2500S is locked.

FAQ

Q: Which processor is faster in multi-core rendering?

A: The Intel Core i7-2920XM is faster in all Cinebench multi-core tests. In Cinebench R23 multi-core, it scores 3504 versus the i5-2500S’s 2867, a difference of 18.2%. The i7 also wins Cinebench R15 multi-core (353 vs 288) and Cinebench R20 multi-core (1471 vs 1204).

Q: Why does the Intel Core i5-2500S win in Geekbench single-core?

A: The i5-2500S scores 582 in Geekbench single-core, which is 35.3% higher than the i7-2920XM’s 430. This is likely due to the i5’s higher base clock of 2.70 GHz and boost clock of 3.70 GHz, compared to the i7’s 2.50 GHz base and 3.50 GHz boost, giving the desktop chip a raw frequency advantage in workloads that do not scale with threads.

Q: Does the i7-2920XM have more cores than the i5-2500S?

A: No, both processors have 4 physical cores. However, the i7-2920XM supports 8 threads through Hyper-Threading, while the i5-2500S is limited to 4 threads. This means the i7 can process twice as many concurrent instruction streams.

Q: What is the TDP difference between these two CPUs?

A: The Intel Core i5-2500S has a TDP of 65W, while the Intel Core i7-2920XM has a lower TDP of 55W. This is notable because the i7 is a mobile processor, yet it delivers higher multi-threaded performance while consuming less power on paper.

Q: Are these processors from the same generation?

A: Yes, both are based on the Sandy Bridge architecture and are classified under the Sandy Bridge generation. The i5-2500S is listed as Core i5 (Sandy Bridge), while the i7-2920XM is listed as Core i7 Extreme (Sandy Bridge). Both were released in January 2011.

Q: Which CPU has a larger L3 cache?

A: The Intel Core i7-2920XM has 8 MB of shared L3 cache, while the Intel Core i5-2500S has 6 MB of shared L3 cache. This gives the i7 a 33% larger cache pool for frequently accessed data.

Specification Differences

The two processors differ in several key specification fields. The i5-2500S has 4 threads, while the i7-2920XM has 8 threads. The i5 has a base clock of 2.70 GHz and a boost clock of 3.70 GHz; the i7 has a base clock of 2.50 GHz and a boost clock of 3.50 GHz. The TDP is 65W for the i5 and 55W for the i7. The socket types are exclusive: the i5 uses Intel Socket 1155, while the i7 uses Intel Socket G2 (988B).

The L3 cache is 6 MB for the i5 and 8 MB for the i7. The memory bandwidth is listed as 25.6 GB/s for the i7, while it is not specified for the i5. PCIe support differs, with the i5 supporting Gen 3 (16 lanes) and the i7 supporting Gen 2 (16 lanes). The integrated graphics are Intel HD 2000 for the i5 and Intel HD 3000 for the i7. The i7-2920XM has an unlocked multiplier, while the i5-2500S does not. The market segments are Desktop for the i5 and Mobile for the i7. The i7-2920XM has a launch MSRP of $1096; the i5-2500S has no launch MSRP listed.

Head-to-Head Benchmarks

The most decisive victory for the Intel Core i7-2920XM comes in Cinebench R15 multi-core, where it scores 353 against the i5-2500S’s 288, a 18.4% advantage. This margin is consistent across Cinebench R20 multi-core (1471 vs 1204, -18.2%) and Cinebench R23 multi-core (3504 vs 2867, -18.2%). The i7’s single-core performance in Cinebench R20 (207 vs 169) and Cinebench R23 (494 vs 404) also shows an 18.2% lead, indicating that its architectural efficiency and larger cache benefit even lightly threaded Cinebench workloads.

The Intel Core i5-2500S fights back in Geekbench multi-core, winning 1511 to 1452, a 4.1% margin. This is a notable reversal, as it suggests the i5’s higher clocks and lower thread overhead allow it to outperform the i7 in this particular benchmark. The gap widens dramatically in Geekbench single-core, where the i5 scores 582 versus the i7’s 430, a 35.3% victory. This is the single largest delta in the entire comparison, making it clear that the i5-2500S is the superior choice for tasks that rely on single-thread performance as measured by Geekbench. The i7 wins 5 of the 7 head-to-head benchmarks, but the i5’s two wins are substantial enough to define its use case.

The Verdict

The data points to a clear division of labor. The Intel Core i7-2920XM is the processor to choose for multi-threaded rendering and Cinebench-style workloads, where its 8 threads and 8 MB L3 cache deliver consistent 18%+ wins over the i5-2500S. Its 55W TDP is also lower than the i5’s 65W, making it a surprisingly efficient choice for a mobile Extreme Edition chip. The unlocked multiplier adds further flexibility for enthusiasts who want to push performance beyond stock settings.

The Intel Core i5-2500S, despite its desktop positioning and higher TDP, is the winner for Geekbench-centric applications. Its 35.3% lead in Geekbench single-core suggests that legacy software or single-threaded tasks will feel significantly snappier on the i5. The 4.1% win in Geekbench multi-core also shows that not all multi-threaded tests favor the i7. If the primary use case involves Geekbench scores or single-threaded responsiveness, the i5-2500S is the better choice. For everything else, particularly Cinebench rendering, the i7-2920XM is the data-backed pick. Both processors sit at the 27th percentile of all CPUs, but their benchmark profiles are polar opposites.