Intel Core i5-2500K vs Intel Core i7-3770T Comparison

The Intel Core i5-2500K and Intel Core i7-3770T are both legacy Socket 1155 parts, but they deliver dramatically different performance profiles. The i7-3770T wins the majority of head-to-head benchmarks, taking 5 of 7 tests, while the i5-2500K secures a decisive victory in Geekbench. The data indicates the i7-3770T is the stronger overall processor for multi-threaded and modern single-threaded workloads, despite its lower base clock, while the i5-2500K retains an edge in specific legacy benchmarks.

Head-to-Head Benchmarks

The Intel Core i7-3770T dominates the Cinebench suite with consistent, near-uniform margins. In Cinebench R15 multi-core, the i7-3770T scores 464 against the i5-2500K’s 354, a 23.7% advantage. This pattern repeats in Cinebench R20 multi-core, where the i7-3770T posts 1936 versus 1479, again a 23.6% lead. The R20 single-core test shows the i7-3770T at 273 versus 208, a 23.8% delta. The i7-3770T extends its lead in Cinebench R23, scoring 4611 multi-core and 651 single-core, compared to the i5-2500K’s 3523 and 497, yielding 23.6% and 23.7% deltas respectively. Across all five Cinebench tests, the i7-3770T is consistently about 24% faster, a strong indicator of architectural and thread-count superiority rather than a workload-specific anomaly.

The Intel Core i5-2500K strikes back in Geekbench, and it does so emphatically. In Geekbench multi-core, the i5-2500K scores 2434 against the i7-3770T’s 1916, a 27% advantage. The single-core test is even more lopsided: the i5-2500K scores 805 versus 592, a 36% lead. These results are notable because they reverse the Cinebench trend entirely. The i5-2500K’s higher base clock of 3.30 GHz (versus 2.50 GHz) and higher TDP of 95W (versus 45W) likely contribute to its Geekbench dominance, as that benchmark appears to favor raw clock speed over the i7-3770T’s hyper-threading and newer architecture. The head-to-head data shows a clear split: the i7-3770T wins all Cinebench variants, while the i5-2500K wins all Geekbench variants.

Architecture Differences

The two processors belong to different Intel microarchitectures. The i5-2500K is built on Sandy Bridge, using a 32 nm process node with 1,160 million transistors on a 216 mm² die. The i7-3770T is Ivy Bridge, manufactured on a 22 nm node with 1,400 million transistors packed into a smaller 160 mm² die. This node shrink explains how the i7-3770T achieves a much lower 45W TDP while still delivering superior Cinebench performance. Both chips share the same Socket 1155, but they diverge on cache and features.

Core counts are identical at 4 cores, but threading differs: the i7-3770T supports 8 threads via Hyper-Threading, while the i5-2500K is limited to 4 threads. This explains the i7-3770T’s multi-core Cinebench advantage, as it can process twice the thread count. Cache hierarchies also differ. Both have 64 KB L1 and 256 KB L2 per core, but the i7-3770T has 8 MB of shared L3 versus the i5-2500K’s 6 MB. Memory support is DDR3 dual-channel for both, though the i5-2500K lists a memory bandwidth of 25.6 GB/s while the i7-3770T’s bandwidth figure is not provided in the data.

PCIe capabilities differ significantly. The i5-2500K offers PCIe Gen 2 with 16 lanes (CPU only), while the i7-3770T provides PCIe Gen 3 with 16 lanes (CPU only). Integrated graphics also differ: the i5-2500K has Intel HD 3000, while the i7-3770T has Intel HD 4000. The i7-3770T’s clock speeds are lower on base (2.50 GHz) but identical on boost (3.70 GHz) to the i5-2500K. The i5-2500K has an unlocked multiplier, while the i7-3770T is locked. Production status shows the i5-2500K as end-of-life; the i7-3770T’s status is not listed. The i5-2500K released earlier, on 2011-01-08, versus the i7-3770T’s 2012-04-28.

FAQ

Q: Which processor has a higher average benchmark score?

A: The i5-2500K has an average benchmark score of 1329, while the i7-3770T scores 1314. The difference is small, less than 1.2%, and both sit at the 35th percentile of all CPUs.

Q: Why does the i7-3770T win Cinebench tests but lose Geekbench tests?

A: The i7-3770T’s 8 threads and 8 MB L3 cache boost its Cinebench scores, which scale with multi-threading. The i5-2500K’s higher 3.30 GHz base clock and 95W TDP give it an edge in Geekbench, which appears to favor clock speed over thread count.

Q: Are both processors on the same socket?

A: Yes, both use Intel Socket 1155. However, they differ in PCIe generation: the i5-2500K is Gen 2, while the i7-3770T is Gen 3.

Q: Which CPU has more cache?

A: The i7-3770T has 8 MB of shared L3 cache, while the i5-2500K has 6 MB. Both have identical 64 KB L1 and 256 KB L2 per core.

Q: Is the i5-2500K overclockable?

A: Yes, the i5-2500K has an unlocked multiplier. The i7-3770T does not, as its multiplier is locked.

Q: What are the transistor counts for each processor?

A: The i5-2500K contains 1,160 million transistors on a 216 mm² die, while the i7-3770T contains 1,400 million transistors on a 160 mm² die.

Specification Differences

Both processors share Intel Socket 1155, 4 cores, DDR3 dual-channel memory support, and no ECC memory support. The key differences are as follows:

• Threads: i5-2500K has 4; i7-3770T has 8.
• Base Clock: i5-2500K is 3.30 GHz; i7-3770T is 2.50 GHz.
• Boost Clock: Both are 3.70 GHz (identical).
• TDP: i5-2500K is 95W; i7-3770T is 45W.
• Architecture / Node: i5-2500K is Sandy Bridge on 32 nm; i7-3770T is Ivy Bridge on 22 nm.
• Transistors: 1,160 million (i5-2500K) vs 1,400 million (i7-3770T).
• Die Size: 216 mm² (i5-2500K) vs 160 mm² (i7-3770T).
• L3 Cache: 6 MB (i5-2500K) vs 8 MB (i7-3770T).
• PCIe: Gen 2 (i5-2500K) vs Gen 3 (i7-3770T).
• Integrated Graphics: Intel HD 3000 (i5-2500K) vs Intel HD 4000 (i7-3770T).
• Multiplier: Unlocked (i5-2500K) vs locked (i7-3770T).
• Release Date: 2011-01-08 (i5-2500K) vs 2012-04-28 (i7-3770T).
• Memory Bandwidth: 25.6 GB/s (i5-2500K) vs not listed (i7-3770T).
• Launch MSRP: $216 (i5-2500K only; i7-3770T has none listed).

Where Each One Wins

The i7-3770T is the clear winner for multi-threaded productivity workloads. Its Cinebench R23 multi-core score of 4611 is 23.6% higher than the i5-2500K’s 3523, and it maintains a similar edge across R15 and R20 multi-core tests. The 8 threads and larger 8 MB L3 cache make it the better choice for rendering, video encoding, and other parallel tasks. Its 45W TDP also makes it a more power-efficient option for those workloads, though the data does not provide direct power consumption measurements.

The i5-2500K wins in Geekbench, which often correlates with general system responsiveness and legacy application performance. Its Geekbench multi-core score of 2434 is 27% higher than the i7-3770T’s 1916, and its single-core score of 805 is 36% higher. The higher base clock of 3.30 GHz and the unlocked multiplier give it an advantage in scenarios that favor raw clock speed or overclocking. The i5-2500K also has a listed memory bandwidth of 25.6 GB/s, which may benefit memory-sensitive tasks, though the i7-3770T’s bandwidth is not provided for comparison.

The i7-3770T also wins single-core Cinebench tests, scoring 651 in R23 single-core versus 497 for the i5-2500K, a 23.7% lead. This suggests the Ivy Bridge architecture’s instructions-per-clock advantage over Sandy Bridge. However, the i5-2500K’s Geekbench single-core win (805 vs 592) contradicts this, indicating that benchmark methodology significantly influences which CPU appears faster. The data shows the i7-3770T is more consistent across Cinebench, while the i5-2500K is specifically strong in Geekbench.

The Verdict

The data points to a clear overall winner for most modern workloads: the Intel Core i7-3770T. It wins 5 of 7 head-to-head benchmarks, including every Cinebench variant, with margins of approximately 24%. Its 8 threads, 8 MB L3 cache, and 22 nm Ivy Bridge architecture deliver superior multi-core and single-core performance in rendering workloads. The 45W TDP is a bonus for system builders prioritizing efficiency, though the data does not include direct power consumption comparisons.

The Intel Core i5-2500K is the pick for users prioritizing Geekbench performance or overclocking. Its 27% and 36% wins in Geekbench multi-core and single-core, respectively, are substantial. The unlocked multiplier allows for manual overclocking, which the i7-3770T cannot offer. However, its 95W TDP and older Sandy Bridge architecture put it at a disadvantage in Cinebench, where the i7-3770T is consistently faster.

For a neutral recommendation based strictly on benchmark results, the i7-3770T is the stronger processor for threaded workloads and general Cinebench performance. The i5-2500K remains competitive only in Geekbench, where it dominates. Both CPUs sit at the 35th percentile of all CPUs, and their average benchmark scores are nearly identical (1329 vs 1314). The choice hinges on whether the user’s workload aligns with Cinebench-style multi-threading (i7-3770T) or Geekbench-style clock-sensitive tasks (i5-2500K), with the i7-3770T offering the broader advantage across the test suite.