Intel Core i5-2300 vs Intel Core i7-975 Comparison

Head-to-Head Benchmarks

The benchmark data from the database shows a consistent, though narrow, victory for the Intel Core i7-975 across the entire Cinebench test suite. The i7-975 wins all five recorded head-to-head comparisons, but the margins are remarkably slim. The largest advantage appears in the multicore tests, where the i7-975 leads by only 1% in both Cinebench R15 and R20. In Cinebench R15 multicore, the i7-975 scores 299 against the i5-2300's 296, a difference of just three points. The R20 multicore test shows a similar pattern: 1249 for the i7-975 versus 1237 for the i5-2300.

The single-core results are even closer. In Cinebench R20 single-core, the i7-975 scores 175, and the i5-2300 scores 174, giving the older processor a 0.6% edge. The Cinebench R23 single-core test follows the same trend, with the i7-975 posting 419 against 416 for the i5-2300, a 0.7% difference. The R23 multicore test rounds out the comparison, showing 2974 for the i7-975 and 2947 for the i5-2300, a 0.9% lead.

The data indicates that the i7-975's advantage is consistent but not transformative. The 1% delta in the heaviest multicore workloads suggests that the extra threads of the i7-975 provide a small real-world benefit, but the newer architecture of the i5-2300 nearly closes the gap. The recorded measurements place both processors at the 28th percentile among all CPUs, meaning they occupy the same performance tier in the database's broader ranking. The average benchmark scores reinforce this parity: the i7-975 averages 1023, while the i5-2300 averages 1014. The i7-975's nearest rivals include the AMD Ryzen 5 PRO 2500U at an average of 1024 (a 0% delta), the AMD Phenom II X6 1075T at 1024 (a -0.1% delta), and the Intel Pentium Gold G5600 at 1022 (a 0.1% delta). The i5-2300's nearest rivals are the Intel Xeon W5580 at 1012 (a 0.2% delta), the Intel Core i7-2675QM at 1012 (a 0.2% delta), and the Intel Core i3-4160 at 1017 (a -0.3% delta). These rival comparisons confirm that both CPUs sit in a crowded field of older and entry-level parts, where a few points separate one model from the next.

FAQ

Q: Which processor wins the most head-to-head benchmarks?

A: The Intel Core i7-975 wins all five recorded head-to-head tests against the Intel Core i5-2300. The database shows 5 wins for the i7-975 and 0 wins for the i5-2300 across Cinebench R15 multicore, R20 multicore, R20 single-core, R23 multicore, and R23 single-core.

Q: How large is the performance difference between the two in multicore workloads?

A: The multicore differences are minimal. In Cinebench R15 multicore, the i7-975 leads by 1% (299 versus 296). In Cinebench R20 multicore, the lead is again 1% (1249 versus 1237). In Cinebench R23 multicore, the lead is 0.9% (2974 versus 2947).

Q: Do the single-core scores show a different winner?

A: No, the i7-975 still wins, but by an even smaller margin. The single-core deltas are 0.6% in Cinebench R20 (175 versus 174) and 0.7% in Cinebench R23 (419 versus 416). The i7-975 holds the top spot in every single-core test.

Q: How do these processors compare to their nearest rivals in the database?

A: The i7-975 is effectively tied with its nearest rivals. Its average score of 1023 is matched by the AMD Ryzen 5 PRO 2500U at 1024 (0% delta) and the AMD Phenom II X6 1075T at 1024 (-0.1% delta). The i5-2300, with an average of 1014, sits slightly ahead of the Intel Xeon W5580 at 1012 (0.2% delta) and the Intel Core i7-2675QM at 1012 (0.2% delta), but slightly behind the Intel Core i3-4160 at 1017 (-0.3% delta).

Q: What is the overall performance percentile for both CPUs?

A: Both the Intel Core i7-975 and the Intel Core i5-2300 are recorded at the 28th percentile among all CPUs in the database. This places them in the same performance tier despite the i7-975's consistent head-to-head wins.

Q: What are the differences in clock speeds that might explain the results?

A: The i7-975 has a base clock of 3.33 GHz and a boost clock of 3.60 GHz. The i5-2300 has a base clock of 2.80 GHz and a boost clock of 3.10 GHz. The i7-975's higher clock speeds likely contribute to its edge in both single-core and multicore tests, although the newer architecture of the i5-2300 compensates substantially.

The Verdict

The recorded data paints a clear picture: the Intel Core i7-975 is the faster processor in every benchmark category, but the margin is so thin that the practical difference for most workloads is negligible. The i7-975's 1% lead in multicore tests and sub-1% lead in single-core tests means that users would be hard-pressed to notice a difference in everyday computing. The i7-975 does offer more threads (8 versus 4), which can be relevant for heavily threaded applications, but the benchmark scores show that the i5-2300's newer architecture nearly erases that advantage.

Who should pick the i7-975? The data suggests this processor is the choice for users who need the absolute highest score in the database's Cinebench tests and who value the unlocked multiplier, which allows for overclocking. The i7-975 also has a higher base and boost clock, which explains its consistent wins. However, the i7-975 carries a launch MSRP of $1059, and its 130 TDP is considerably higher than the i5-2300's 95 TDP.

Who should pick the i5-2300? The data indicates that the i5-2300 offers nearly identical performance at a lower power envelope and with a more modern platform. It uses the Intel Socket 1155, supports PCIe Gen 3 with 16 lanes, and includes integrated graphics (Intel HD 2000). The i5-2300's average score of 1014 is only 9 points below the i7-975's 1023, a difference of less than 1%. For users building a system where power consumption, newer features, and platform compatibility matter more than a marginal benchmark lead, the i5-2300 is the more balanced choice. The verdict is not about a clear winner, but about trade-offs: the i7-975 wins on raw scores, while the i5-2300 wins on efficiency and platform modernity.

Specification Differences

The two processors differ across several key specifications. The Intel Core i7-975 has 4 cores and 8 threads, while the Intel Core i5-2300 has 4 cores and 4 threads. The i7-975 runs at a base clock of 3.33 GHz with a boost clock of 3.60 GHz, whereas the i5-2300 runs at 2.80 GHz base and 3.10 GHz boost. The thermal design power (TDP) also differs significantly: the i7-975 is rated at 130 watts, while the i5-2300 is rated at 95 watts.

The sockets are different. The i7-975 uses Intel Socket 1366, and the i5-2300 uses Intel Socket 1155. Memory support also diverges: the i7-975 uses a triple-channel memory bus with a recorded bandwidth of 25.6 GB/s, while the i5-2300 uses a dual-channel memory bus with no bandwidth figure recorded. Both support DDR3 memory, and neither supports ECC. The PCIe interface differs as well: the i7-975 is listed as PCIe Gen 2, while the i5-2300 is listed as PCIe Gen 3 with 16 lanes (CPU only).

The i7-975 has an unlocked multiplier, while the i5-2300 does not. The i5-2300 includes integrated graphics (Intel HD 2000), while the i7-975 has no integrated graphics listed. The launch MSRP is recorded for the i7-975 at $1059, but no launch MSRP is listed for the i5-2300. The release dates are also distinct: the i7-975 was released on 2009-06-01, and the i5-2300 was released on 2011-01-08.

Architecture Differences

The architectural gap between these two processors is substantial. The Intel Core i7-975 is built on the Nehalem architecture, codenamed Bloomfield, while the Intel Core i5-2300 uses the Sandy Bridge architecture. The i7-975 is part of the Core i7 Extreme generation, and the i5-2300 belongs to the Core i5 generation. The process node differs: the i7-975 uses a 45 nm process, while the i5-2300 uses a 32 nm process. The foundry is Intel for both.

The transistor counts and die sizes reflect the generational shift. The i7-975 contains 731 million transistors on a die size of 263 mm². The i5-2300 contains 1,160 million transistors on a smaller die of 216 mm². This indicates that Sandy Bridge packed significantly more transistors into a smaller area, which helps explain how the i5-2300 achieves near-parity with the i7-975 despite lower clock speeds and fewer threads.

Cache configurations also differ. Both processors have 64 KB of L1 cache per core and 256 KB of L2 cache per core. The shared L3 cache, however, is larger on the i7-975: 8 MB shared, versus 6 MB shared on the i5-2300. The i7-975's larger cache and higher clocks help it edge ahead in the benchmarks, but the i5-2300's newer architecture and higher transistor density allow it to compensate. The i5-2300 also integrates graphics, a feature absent from the i7-975, and supports PCIe Gen 3, while the i7-975 is limited to PCIe Gen 2. The memory controllers differ as well, with the i7-975 using triple-channel memory and the i5-2300 using dual-channel. These architectural differences explain why the i7-975, despite being older and more power-hungry, still manages to win every benchmark in the database, and why the i5-2300 comes so close.