CPU Comparison

Head-to-Head Benchmarks

The benchmark data presents a striking picture: the Intel Core i3-4340 wins every single head-to-head comparison against the Intel Core i7-975, though by remarkably narrow margins. Across five Cinebench tests, the i3-4340 takes all five victories, while the i7-975 secures zero. This is a complete sweep, but the deltas are so small that they border on statistical noise.

Starting with the oldest test, Cinebench R15 multicore, the i3-4340 scores 300 against 299 for the i7-975, a delta of just 0.3%. The pattern repeats in Cinebench R20 multicore, where the i3-4340 manages 1252 versus 1249, again a 0.2% edge. The single-core results tell a similar story: in Cinebench R20 single-core, the i3-4340 posts 176 against 175, a 0.6% advantage, and in Cinebench R23 single-core, it leads 421 to 419, a 0.5% margin. The multicore R23 test sees the i3-4340 at 2983 versus 2974, a 0.3% difference.

What does this mean? The two processors are effectively performance twins in these workloads, despite their vastly different architectures and release dates. The data suggests that the newer dual-core i3-4340, with its Haswell architecture and higher base clock of 3.60 GHz, compensates for its two fewer physical cores through superior per-core efficiency. The i7-975, which relies on four cores and eight threads at a 3.33 GHz base clock with a 3.60 GHz boost, cannot translate its extra hardware into a measurable advantage in Cinebench.

The average benchmark scores reinforce this conclusion. The i3-4340 holds an average score of 1026, while the i7-975 sits at 1023. Both processors occupy the 28th percentile among all CPUs, meaning they are statistically indistinguishable in overall standing. The nearest rivals for the i3-4340 include the Intel Processor N150 at 1025 (0.1% behind), the Intel Core i7-5650U at 1027 (0.1% ahead), and the AMD Ryzen Embedded V1202B at 1027 (0.1% ahead). For the i7-975, the nearest rivals include the AMD Ryzen 5 PRO 2500U at 1024 (0% delta), the AMD Phenom II X6 1075T at 1024 (0.1% behind), and the Intel Pentium Gold G5600 at 1022 (0.1% ahead). These rival clusters show that both CPUs sit in a crowded mid-table region where tiny score differences define the rankings.

FAQ

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

A: The Intel Core i3-4340 wins all five head-to-head tests, including Cinebench R15 multicore, Cinebench R20 multicore and single-core, and Cinebench R23 multicore and single-core. The Intel Core i7-975 wins none of them.

Q: How large is the performance gap in single-core workloads?

A: The i3-4340 leads by 0.6% in Cinebench R20 single-core (176 versus 175) and by 0.5% in Cinebench R23 single-core (421 versus 419). These are the largest deltas in the entire comparison, but they remain sub-1% differences.

Q: Do the two CPUs have similar overall benchmark standings?

A: Yes. The i3-4340 has an average benchmark score of 1026 and sits at the 28th percentile, while the i7-975 has an average score of 1023 and also sits at the 28th percentile. Their nearest rival lists overlap, with the AMD Phenom II X6 1075T appearing near both.

Q: What is the memory bandwidth difference between the two?

A: The i7-975 supports triple-channel memory with a rated bandwidth of 25.6 GB/s, while the i3-4340 supports dual-channel memory and has no listed bandwidth figure. The i7-975's memory subsystem is theoretically wider, yet this does not translate into a benchmark win.

Q: Does the i3-4340 have integrated graphics?

A: Yes, the i3-4340 includes Intel HD 4600 integrated graphics. The i7-975 has no integrated graphics, meaning it requires a discrete GPU for display output.

Q: Are both processors unlocked for overclocking?

A: No. The i7-975 has an unlocked multiplier, making it overclockable, while the i3-4340 does not have an unlocked multiplier.

Where Each One Wins

The data reveals a clean split: the i3-4340 wins everywhere in raw benchmark terms, but the i7-975 offers capabilities that the i3-4340 lacks. For users prioritizing Cinebench scores specifically, the i3-4340 is the clear choice, as it edges ahead in every tested scenario. The margins are tiny, but they are consistent and favor the newer architecture.

However, the i7-975 wins in areas that the benchmarks do not capture. It has four cores and eight threads, double the core count of the i3-4340. For workloads that scale beyond the five Cinebench tests in this dataset, such as heavily threaded rendering, video encoding, or multitasking environments, the i7-975's additional physical cores could provide advantages that Cinebench does not reveal. The i7-975 also supports triple-channel memory with a rated bandwidth of 25.6 GB/s, compared to the i3-4340's dual-channel setup. In memory-bandwidth-sensitive applications, the i7-975 offers a wider pipeline.

The i7-975 also has an unlocked multiplier, allowing overclocking headroom that the i3-4340 cannot match. Users willing to push clock speeds could potentially extract more performance from the i7-975, though the data does not quantify this potential. The i3-4340, on the other hand, wins on efficiency-related characteristics: its TDP is 54 watts versus 130 watts for the i7-975, and it includes integrated graphics, making it a more self-contained solution for basic systems.

Specification Differences

The two processors differ across nearly every major specification. The i3-4340 has 2 cores and 4 threads, while the i7-975 has 4 cores and 8 threads. The i3-4340's base clock is 3.60 GHz with no boost clock, while the i7-975 has a base clock of 3.33 GHz and a boost clock of 3.60 GHz. The i3-4340 runs on Intel Socket 1150, while the i7-975 uses Intel Socket 1366. TDP differs substantially: 54 watts for the i3-4340 versus 130 watts for the i7-975.

Memory support differs in channel configuration: the i3-4340 uses dual-channel DDR3, while the i7-975 uses triple-channel DDR3 and has a rated bandwidth of 25.6 GB/s. PCIe generation also differs, with the i3-4340 supporting Gen 3 and the i7-975 supporting Gen 2. The i3-4340 includes Intel HD 4600 integrated graphics, while the i7-975 has none. The i7-975 has an unlocked multiplier; the i3-4340 does not. Production status also differs: the i7-975 is marked end-of-life, while the i3-4340 has no production status listed. The i7-975 has a launch MSRP of $1059, while the i3-4340 has no listed launch MSRP.

Architecture Differences

The architectural gap between these two processors is substantial and explains much of the benchmark parity. The i3-4340 uses the Haswell architecture, built on a 22 nm process node with 1,400 million transistors on a 177 mm² die. The i7-975 uses the Nehalem architecture, specifically the Bloomfield codename, built on a 45 nm process node with 731 million transistors on a 263 mm² die. The Haswell chip packs nearly twice the transistor count into a smaller die, reflecting a much denser and more modern manufacturing process.

Cache configurations differ as well. Both have 64 KB of L1 cache per core and 256 KB of L2 cache per core, but the L3 cache differs: the i3-4340 has 4 MB shared, while the i7-975 has 8 MB shared. The i7-975's larger L3 cache compensates for its older architecture, while the i3-4340 relies on architectural efficiency. The i3-4340 belongs to the Core i3 (Haswell) generation, while the i7-975 belongs to the Core i7 Extreme (Bloomfield) generation, a distinction that positions the latter as a former flagship part.

The i7-975's release date is 2009-06-01, while the i3-4340's release date is 2013-08-31, a gap of over four years. The i7-975 was designed for the enthusiast extreme segment, as indicated by its "Core i7 Extreme" branding, while the i3-4340 targets the mainstream desktop segment. Both processors lack ECC memory support and both are manufactured by Intel, but their foundry processes are separated by two generations of technology.

The Verdict

The benchmark data is unambiguous: the Intel Core i3-4340 outperforms the Intel Core i7-975 in every Cinebench test recorded, with win margins ranging from 0.2% to 0.6%. If the decision rests solely on these five benchmarks, the i3-4340 is the superior processor. It achieves this with half the cores, half the threads, a smaller TDP (54 watts versus 130 watts), and integrated graphics, all while delivering identical or better scores.

That said, the i7-975 should not be dismissed outright. Its four cores and eight threads, triple-channel memory support with 25.6 GB/s bandwidth, and unlocked multiplier offer capabilities that the i3-4340 lacks. For users who need more threads for parallel workloads beyond Cinebench, or who plan to overclock, the i7-975 provides headroom that the i3-4340 cannot match. The i7-975's larger 8 MB shared L3 cache also suggests potential advantages in cache-sensitive applications.

The practical recommendation depends on the user's priorities. For a system where Cinebench scores matter most, or where integrated graphics and lower power consumption are valuable, the i3-4340 is the data-backed choice. For users with workloads that exploit additional cores, wider memory channels, or overclocking, the i7-975 offers structural advantages that benchmarks do not capture. The data shows that in the tested metrics, the i3-4340 is the winner, but the i7-975 remains a viable alternative for scenarios outside this test suite. Both processors sit at the 28th percentile among all CPUs, making them comparable mid-tier options despite their generational and architectural differences.