Intel Core i7-975 vs Intel Pentium Gold G5600 Comparison

The Intel Core i7-975 and Intel Pentium Gold G5600 are separated by nearly a decade of silicon evolution, yet their benchmark scores are strikingly close. The i7-975, a 2009-era Nehalem flagship with four cores and eight threads, posts an average benchmark score of 1023. The Pentium Gold G5600, a 2018 Coffee Lake part with two cores and four threads, scores 1022. The data shows a near-parity in raw throughput, with the older CPU holding a 0.1% edge in average score. This comparison is less about generational dominance and more about how architectural efficiency can offset core-count advantages.

FAQ

Q: Which processor has more cores and threads?

A: The Intel Core i7-975 has 4 cores and 8 threads, while the Intel Pentium Gold G5600 has 2 cores and 4 threads. The i7-975 doubles the physical core count and thread count of the G5600.

Q: How do their multi-core benchmark scores compare?

A: In Cinebench R20 multi-core, the i7-975 scores 1249, edging out the G5600’s 1247 by a 0.2% margin. In Cinebench R23 multi-core, the i7-975 scores 2974 versus 2971, a 0.1% difference. The i7-975 wins all five head-to-head benchmark comparisons, though by a maximum of 0.2%.

Q: Are the single-core performance results identical?

A: Yes, in both Cinebench R20 and R23 single-core tests, both processors score exactly 175 and 419, respectively. The deltaPct is 0% in both cases, indicating no measurable single-threaded performance difference between the two.

Q: What are the architectural differences between the two CPUs?

A: The i7-975 uses the Nehalem architecture (codename Bloomfield) on a 45 nm process with 731 million transistors and a 263 mm² die. The G5600 uses the Coffee Lake architecture on a 14 nm process with a 126 mm² die. The i7-975 has 8 MB of shared L3 cache, while the G5600 has 4 MB.

Q: Which processor supports ECC memory?

A: The Intel Pentium Gold G5600 supports ECC memory, while the Intel Core i7-975 does not. This is a significant feature difference for systems requiring error-checking memory.

Q: How do their memory bandwidth figures compare?

A: The i7-975 uses triple-channel DDR3 memory with a bandwidth of 25.6 GB/s. The G5600 uses dual-channel DDR4 memory with a higher bandwidth of 38.4 GB/s. The G5600’s memory subsystem provides 50% more theoretical bandwidth despite having fewer channels.

Architecture Differences

The architectural gap between these two processors is substantial. The Core i7-975 is built on Intel’s Nehalem architecture, specifically the Bloomfield die, manufactured on a 45 nm process. It crams 731 million transistors into a 263 mm² die. The Pentium Gold G5600, in contrast, uses the Coffee Lake architecture on a 14 nm process with a 126 mm² die. The process node shrink from 45 nm to 14 nm explains how the G5600 delivers comparable performance with half the physical cores.

Cache hierarchies differ in total capacity but not in per-core allocation. Both CPUs feature 64 KB of L1 cache per core and 256 KB of L2 cache per core. The shared L3 cache is where they diverge: the i7-975 has 8 MB shared across its four cores, while the G5600 has 4 MB shared across two cores. Per-core L3 cache is effectively identical at 2 MB per core, but the i7-975’s larger absolute capacity benefits workloads that can utilize the full pool.

Memory support represents a major divergence. The i7-975 uses triple-channel DDR3 with a theoretical bandwidth of 25.6 GB/s. The G5600 uses dual-channel DDR4 with a theoretical bandwidth of 38.4 GB/s. Despite fewer channels, the newer memory standard gives the G5600 a 50% bandwidth advantage. The G5600 also supports ECC memory, a feature absent on the i7-975. PCIe connectivity differs as well: the i7-975 has Gen 2 lanes, while the G5600 has Gen 3 with 16 CPU lanes. The G5600 is the only one of the two with integrated graphics, featuring UHD Graphics 630; the i7-975 has no integrated GPU.

Clock speeds tell an interesting story. The i7-975 has a base clock of 3.33 GHz and a boost clock of 3.60 GHz. The G5600 has a base clock of 3.90 GHz with no boost clock listed. The G5600’s higher base clock compensates for its lower core count in single-threaded scenarios, which explains the identical single-core benchmark results. The i7-975 has an unlocked multiplier, while the G5600’s is locked. Power consumption differs dramatically: the i7-975 has a TDP of 130 watts, compared to 54 watts for the G5600.

The Verdict

The benchmark data indicates these two processors are effectively tied in performance, with the i7-975 winning all five head-to-head tests by margins of 0% to 0.2%. The i7-975’s average benchmark score of 1023 is just 0.1% higher than the G5600’s 1022. Both sit at the 28th percentile among all CPUs, placing them in the same performance tier.

For users prioritizing multi-threaded workloads, the i7-975’s 4-core/8-thread configuration provides a nominal edge, as shown by its 0.2% lead in Cinebench R20 multi-core. However, this advantage is so small as to be negligible in real-world use. For users prioritizing power efficiency, the G5600 is the clear choice, offering nearly identical performance at less than half the TDP (54 watts versus 130 watts). The G5600 also brings modern platform features: DDR4 memory support, PCIe Gen 3, ECC memory capability, and integrated graphics.

The i7-975’s advantages lie in its larger shared cache (8 MB versus 4 MB) and its unlocked multiplier for overclocking. The G5600’s advantages include higher memory bandwidth (38.4 GB/s versus 25.6 GB/s), a more recent architecture, and a smaller die. Given the near-identical benchmark results, the G5600 is the more practical choice for new system builds due to its efficiency and platform modernity, while the i7-975 appeals to those needing legacy Socket 1366 compatibility or overclocking headroom.

Specification Differences

| Specification | Intel Core i7-975 | Intel Pentium Gold G5600 |

|---|---|---|

| Cores | 4 | 2 |

| Threads | 8 | 4 |

| Base Clock | 3.33 GHz | 3.90 GHz |

| Boost Clock | 3.60 GHz | None |

| TDP | 130 W | 54 W |

| Socket | Intel Socket 1366 | Intel Socket 1151 |

| Architecture | Nehalem | Coffee Lake |

| Codename | Bloomfield | Coffee Lake |

| Process Node | 45 nm | 14 nm |

| Transistors | 731 million | Not listed |

| Die Size | 263 mm² | 126 mm² |

| L3 Cache | 8 MB (shared) | 4 MB (shared) |

| Memory Support | DDR3 | DDR4 |

| Memory Bus | Triple-channel | Dual-channel |

| Memory Bandwidth | 25.6 GB/s | 38.4 GB/s |

| ECC Memory | No | Yes |

| PCIe | Gen 2 | Gen 3, 16 Lanes (CPU only) |

| Integrated Graphics | None | UHD Graphics 630 |

| Multiplier Unlocked | Yes | No |

| Launch MSRP | $1059 | $86 |

Head-to-Head Benchmarks

The head-to-head data shows a remarkably consistent pattern: the i7-975 wins every test, but by hair-thin margins. In Cinebench R15 multi-core, both CPUs score exactly 299, resulting in a 0% delta and a nominal win for the i7-975. The identical score indicates that the older architecture’s core advantage is perfectly offset by the newer architecture’s efficiency in this workload.

Cinebench R20 multi-core shows the largest gap between the two. The i7-975 scores 1249, while the G5600 scores 1247, giving the i7-975 a 0.2% advantage. This is the only test where the delta exceeds 0.1%, suggesting that the i7-975’s extra cores and threads provide a slight benefit in sustained multi-threaded rendering. In Cinebench R23 multi-core, the i7-975 again leads, scoring 2974 against the G5600’s 2971, a 0.1% margin.

Single-core results are dead even. In Cinebench R20 single-core, both processors score 175, and in Cinebench R23 single-core, both score 419. The G5600’s higher base clock of 3.90 GHz, compared to the i7-975’s 3.33 GHz base and 3.60 GHz boost, appears to compensate exactly for the architectural generation gap. The data suggests that single-threaded performance has not improved meaningfully from Nehalem to Coffee Lake in these specific workloads.

The overall win tally is 5-0 in favor of the i7-975, but the maximum delta of 0.2% means this is not a decisive victory. Both processors land at the 28th percentile among all CPUs, and their average benchmark scores differ by only 1 point (1023 versus 1022). In practical terms, the benchmark results indicate these are interchangeable in performance, with the i7-975 holding a purely symbolic lead.

Where Each One Wins

The i7-975 wins in multi-threaded scenarios, as evidenced by its leads in all three multi-core benchmarks. The 0.2% edge in Cinebench R20 multi-core is the largest advantage either CPU holds in any test. This suggests that workloads which can utilize more than two cores will see a marginal benefit from the i7-975’s 4-core, 8-thread configuration. The i7-975 also wins on cache capacity, offering 8 MB of shared L3 versus 4 MB on the G5600, which could benefit workloads with large working sets that fit within the larger cache pool.

The G5600 wins on platform efficiency and modern features. Its 54-watt TDP is less than half the i7-975’s 130 watts, making it the obvious choice for power-constrained or thermally sensitive builds. The G5600 supports DDR4 memory with 38.4 GB/s bandwidth, a 50% improvement over the i7-975’s DDR3 bandwidth of 25.6 GB/s. This memory bandwidth advantage could benefit memory-intensive workloads despite the G5600’s lower core count. The G5600 also offers ECC memory support and integrated UHD Graphics 630, allowing for a system without a discrete GPU.

For users building on a modern platform, the G5600’s Socket 1151 and PCIe Gen 3 support provide a more current upgrade path. The i7-975’s Socket 1366 is an end-of-life platform. Users with existing Socket 1366 systems may find the i7-975 a viable drop-in upgrade, particularly given its unlocked multiplier for overclocking. However, the benchmark data shows no performance justification for choosing the i7-975 on a new build, as its only wins are within a 0.2% margin. The G5600’s combination of near-identical performance, lower power draw, and modern features makes it the data-supported choice for most use cases.