Intel Core i7-6950X vs Intel Core i9-9900KS Comparison

The Intel Core i9-9900KS and Intel Core i7-6950X represent two distinct approaches to high-end desktop computing from different eras of Intel's lineup. The i9-9900KS is a Coffee Lake Refresh part designed for maximum clock speeds on a mainstream platform, while the i7-6950X is a Broadwell-E Extreme edition focused on core count and platform bandwidth. Benchmark data shows they land in the same performance percentile (59th vs 59th), with average scores of 4738 and 4734 respectively, making them near-identical in overall throughput despite their architectural differences. The data reveals a clear split: the newer chip dominates in single-threaded and most multi-threaded workloads, while the older Extreme platform part wins in Geekbench's multi-core test and offers substantially more PCIe lanes and memory bandwidth.

FAQ

Q: Which processor has the higher average benchmark score?

A: The Intel Core i9-9900KS has an average benchmark score of 4738, while the Intel Core i7-6950X scores 4734. The difference is a mere 0.1%, placing them as direct rivals in the database's nearestRivals list.

Q: How do the two chips compare in Cinebench R23 multi-core performance?

A: The i9-9900KS scores 16446 in Cinebench R23 multi-core, which is 10.2% ahead of the i7-6950X's 14926. This consistent 10.2% delta appears across all Cinebench versions for both multi-core and single-core tests.

Q: Does the i7-6950X win any benchmark comparison?

A: Yes, in Geekbench multi-core the i7-6950X scores 10637 versus 9771 for the i9-9900KS, an 8.1% advantage. This is the only benchmark out of eight head-to-head comparisons where the i7-6950X comes out ahead.

Q: What is the single-thread performance gap between the two?

A: The i9-9900KS leads significantly in single-threaded workloads. In Geekbench single-core it scores 1715 versus 1334 for the i7-6950X, a 28.6% advantage. In Cinebench R15 single-core, the lead is 233 versus 212, a 9.9% gap.

Q: Are both processors unlocked for overclocking?

A: Yes, both the Intel Core i9-9900KS and the Intel Core i7-6950X have multiplierUnlocked set to true in the data, indicating both are designed for enthusiast overclocking.

Q: What is the production status of these CPUs?

A: Both processors are marked as end-of-life in the production status field, meaning neither is currently in active production.

Architecture Differences

The two processors come from different Intel microarchitectures and platform generations. The i9-9900KS uses the Coffee Lake architecture with the codename Coffee Lake-R, belonging to the Core i9 (Coffee Lake Refresh) generation. It is built on a 14 nm process node with a die size of 180 mm². The i7-6950X uses the older Broadwell architecture with the codename Broadwell-E, part of the Core i7 Extreme (Broadwell-E) generation. It also uses a 14 nm process node but has a larger die size of 246 mm² and contains 3,400 million transistors, a figure not listed for the i9-9900KS.

Core configuration differs substantially. The i9-9900KS has 8 cores and 16 threads, while the i7-6950X has 10 cores and 20 threads, giving the older chip a 25% core count advantage. However, the i9-9900KS compensates with much higher clock speeds: its base clock is 4.00 GHz and boost clock is 5.00 GHz, versus 3.00 GHz base and 3.50 GHz boost for the i7-6950X. This clock advantage explains why the 8-core part can match or beat the 10-core part in many workloads.

Cache hierarchies also differ. Both have 64 KB of L1 cache per core and 256 KB of L2 cache per core, but the L3 cache is significantly different: the i9-9900KS has 16 MB shared while the i7-6950X has 25 MB shared. The i7-6950X's larger L3 cache aligns with its higher core count.

Platform features show a clear generational split. The i9-9900KS uses Intel Socket 1151, while the i7-6950X uses Intel Socket 2011-3. Memory support is DDR4 for both, but the i7-6950X offers quad-channel memory with 76.8 GB/s bandwidth, double the i9-9900KS's dual-channel 42.7 GB/s. PCIe connectivity also favors the Extreme part: the i7-6950X provides 40 PCIe Gen 3 lanes from the CPU, versus 16 lanes for the i9-9900KS. The i9-9900KS includes integrated UHD 630 graphics, while the i7-6950X has no integrated graphics. TDP ratings are 127 W for the i9-9900KS and 140 W for the i7-6950X.

Head-to-Head Benchmarks

The head-to-head data covers eight benchmark tests across Cinebench and Geekbench suites. The i9-9900KS wins seven of these, with the i7-6950X taking one.

The most dominant win for the i9-9900KS is in Geekbench single-core, where it scores 1715 against 1334 for the i7-6950X, a 28.6% advantage. This is the largest delta in the entire comparison and reflects the i9-9900KS's 5.00 GHz boost clock versus the i7-6950X's 3.50 GHz boost.

Across the Cinebench suite, the i9-9900KS maintains a remarkably consistent lead. In Cinebench R15 multi-core, it scores 1657 versus 1504, a 10.2% win. In R15 single-core, the scores are 233 versus 212, a 9.9% win. In R20 multi-core, the i9-9900KS scores 6907 versus 6268, again 10.2% ahead. The R20 single-core test shows 974 versus 884, a 10.2% lead. In R23 multi-core, the i9-9900KS scores 16446 versus 14926, and in R23 single-core it scores 2321 versus 2107 — both also 10.2% wins. This uniformity suggests the i9-9900KS's clock speed advantage translates directly into a fixed performance multiplier across all Cinebench versions.

The single win for the i7-6950X comes in Geekbench multi-core, where it scores 10637 versus 9771 for the i9-9900KS, an 8.1% advantage. This is notable because the i7-6950X loses all three Cinebench multi-core tests despite having 10 cores versus 8. The Geekbench multi-core result suggests that this workload scales better with the i7-6950X's additional cores and threads, or its larger 25 MB L3 cache, whereas Cinebench favors the higher clock speeds of the i9-9900KS.

The average benchmark scores reflect this near-total dead heat. The i9-9900KS averages 4738 and the i7-6950X averages 4734, a delta of just 0.1%. The nearestRivals data confirms this, listing each as the other's top rival with deltas of 0.1% and -0.1% respectively.

The Verdict

The data presents a clear picture for most use cases. The Intel Core i9-9900KS is the better choice for anyone prioritizing single-threaded performance and consistent multi-threaded wins in Cinebench workloads. Its 28.6% lead in Geekbench single-core and 10.2% lead across all Cinebench tests make it the superior processor for the vast majority of desktop applications, which rely on high clock speeds rather than raw core counts.

The Intel Core i7-6950X retains a specific niche. Its 8.1% win in Geekbench multi-core, combined with quad-channel memory support delivering 76.8 GB/s bandwidth and 40 PCIe Gen 3 lanes, makes it the better option for workloads that scale with core count and require extensive I/O or memory bandwidth. The 10-core, 20-thread configuration and larger 25 MB L3 cache provide headroom that the i9-9900KS cannot match in those specific scenarios.

For a general-purpose desktop processor, the i9-9900KS is the stronger recommendation based on benchmark results. It wins 7 out of 8 head-to-head comparisons and does so with a lower 127 W TDP compared to the i7-6950X's 140 W. The i7-6950X is only preferable for users who know their workloads benefit from the Extreme platform's bandwidth and lane advantages, as evidenced by its Geekbench multi-core result.

Both processors sit at the 59th percentile of all CPUs, indicating they are mid-to-high tier performers in the broader database. The i9-9900KS's launch MSRP is $513, while the i7-6950X's launch MSRP is $1723, though pricing considerations are outside the scope of this analysis.

Specification Differences

The two processors differ in the following specification fields:

• Cores: 8 (i9-9900KS) vs 10 (i7-6950X)
• Threads: 16 vs 20
• Base Clock: 4.00 GHz vs 3.00 GHz
• Boost Clock: 5.00 GHz vs 3.50 GHz
• TDP: 127 W vs 140 W
• Socket: Intel Socket 1151 vs Intel Socket 2011-3
• Architecture: Coffee Lake vs Broadwell
• Codename: Coffee Lake-R vs Broadwell-E
• Generation: Core i9 (Coffee Lake Refresh) vs Core i7 Extreme (Broadwell-E)
• Die Size: 180 mm² vs 246 mm²
• Transistors: Not listed vs 3,400 million
• L3 Cache: 16 MB (shared) vs 25 MB (shared)
• Memory Bus: Dual-channel vs Quad-channel
• Memory Bandwidth: 42.7 GB/s vs 76.8 GB/s
• PCIe: Gen 3, 16 Lanes (CPU only) vs Gen 3, 40 Lanes (CPU only)
• Integrated Graphics: UHD 630 vs None
• Release Date: 2019-10-27 vs 2016-05-30
• Launch MSRP: $513 vs $1723
• Part Number: SRG1Q vs SR2PA

Fields that are identical include the 14 nm process node, DDR4 memory support, ECC memory support (false for both), unlocked multiplier (true for both), desktop market segment, and end-of-life production status.