PassMark CPU Mark evaluates processor speed through complex mathematical computations. It provides a reliable metric to compare multi-core performance, where higher scores indicate faster processing for multitasking, gaming, and heavy workloads.

Core i5-10400F vs Core i7-6900K FPS Benchmarks

Predicted gaming performance across popular games. Tested paired with GeForce RTX 5090 to isolate CPU performance.

Search any supported game below to compare 1080p FPS for both components.

Core i5-10400F vs Core i7-6900K: Pros, Cons & Final Verdict

See where each CPU makes more sense in practice: gaming, heavier work, platform cost, power draw, and upgrade path.

Core i5-10400F

2020

Why buy it

✅Costs $929 less on MSRP ($160 MSRP vs $1,089 MSRP).
✅Delivers 504.0% more PassMark for each dollar spent, at 81.4 vs 13.5 PassMark/$ ($160 MSRP vs $1,089 MSRP).
✅Draws 65W instead of 140W, a 75W reduction.
✅Includes a boxed cooler (Yes), unlike Core i7-6900K.

Trade-offs

❌Worse for gaming: lower average FPS than Core i7-6900K across 50 shared CPU benchmark tests.
❌Lower Geekbench multi-core (5,783 vs 7,591).
❌Smaller total L3 cache (12 MB vs 20 MB).

Core i7-6900K

2016

Why buy it

✅Better for gaming: +4.1% higher average FPS across 50 shared CPU benchmark tests.
✅+66.7% larger total L3 cache (20 MB vs 12 MB).
✅150% more PCIe lanes (40 vs 16) for storage and expansion-heavy builds.

Trade-offs

❌Lower PassMark per dollar, at 13.5 vs 81.4 PassMark/$ ($1,089 MSRP vs $160 MSRP).
❌115.4% higher power demand at 140W vs 65W.
❌No boxed cooler included, unlike Core i5-10400F.

Quick Answers

So, is Core i7-6900K better than Core i5-10400F?

Yes. Core i7-6900K is the better all-around CPU here. It gives you a 4.1% average FPS lead across 50 shared CPU game tests in our data, 31.3% better Geekbench multi-core, and 12.7% higher PassMark, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Core i7-6900K is the better pick. According to our tests, it delivers 4.1% more average FPS across 50 shared CPU game tests.

Which one is better for streaming, content creation, and heavy multitasking?

For streaming, content creation, and heavier multitasking, Core i7-6900K is the stronger fit. You are getting 31.3% better Geekbench multi-core, backed by 8 cores and 16 threads. It also has the larger cache pool with 66.7% larger total L3 cache (20 MB vs 12 MB).

Which one is the smarter buy today, not just the cheaper CPU?

Core i7-6900K is still the faster CPU overall, but Core i5-10400F is easier to justify if budget matters more than peak performance. Core i7-6900K comes in 580.6% more expensive on MSRP at $1,089 MSRP versus $160 MSRP, and it still gives you a 4.1% average FPS lead across 50 shared CPU game tests in our data. Core i5-10400F is also 504.0% better value on MSRP (81.4 vs 13.5 PassMark/$), which is why it can still make sense for tighter-budget builds on paper. That said, if you already own a compatible LGA1200 + DDR4 setup, Core i5-10400F can still make sense as a platform-matched option because it avoids a motherboard and RAM swap.

Which one is more future-proof for 2026 and beyond?

Core i5-10400F makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2020 vs 2016). That makes it the safer long-term bet.

Core i5-10400F vs Core i7-6900K Technical Specifications

Side-by-side specs, architecture details, clocks, memory, power, and platform differences.

Core i5-10400F

The Core i5-10400F is manufactured by Intel. It was released in 30 April 2020 (5 years ago). It is based on the Comet Lake (2020−2025) architecture. It features 6 cores and 12 threads. Base frequency is 2.9 GHz, with boost up to 4.3 GHz. L3 cache: 12 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: LGA1200. Thermal design power (TDP): 65 Watt. Memory support: DDR4. Passmark benchmark score: 13,029 points. Launch price was $155.

Core i7-6900K

The Core i7-6900K is manufactured by Intel. It was released in 31 May 2016 (9 years ago). It is based on the Broadwell-E (2016) architecture. It features 8 cores and 16 threads. Base frequency is 3.2 GHz, with boost up to 4 GHz. L3 cache: 20 MB (total). L2 cache: 256 kB (per core). Built on 14 nm process technology. Socket: LGA2011. Thermal design power (TDP): 140 Watt. Memory support: DDR4. Passmark benchmark score: 14,682 points. Launch price was $1,020.

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Processing Power

The Core i5-10400F packs 6 cores / 12 threads, while the Core i7-6900K offers 8 cores / 16 threads — the Core i7-6900K has 2 more cores. Boost clocks reach 4.3 GHz on the Core i5-10400F versus 4 GHz on the Core i7-6900K — a 7.2% clock advantage for the Core i5-10400F (base: 2.9 GHz vs 3.2 GHz). The Core i5-10400F uses the Comet Lake (2020−2025) architecture (14 nm), while the Core i7-6900K uses Broadwell-E (2016) (14 nm). In PassMark, the Core i5-10400F scores 13,029 against the Core i7-6900K's 14,682 — a 11.9% lead for the Core i7-6900K. Geekbench 6 single-core — the metric most relevant to gaming — records 1,454 vs 1,273, a 13.3% lead for the Core i5-10400F that directly translates to higher frame rates. Multi-core Geekbench: 5,783 vs 7,591 (27% advantage for the Core i7-6900K). L3 cache: 12 MB (total) on the Core i5-10400F vs 20 MB (total) on the Core i7-6900K.

Feature	Core i5-10400F	Core i7-6900K
Cores / Threads	6 / 12	8 / 16+33%
Boost Clock	4.3 GHz+7%	4 GHz
Base Clock	2.9 GHz	3.2 GHz+10%
L3 Cache	12 MB (total)	20 MB (total)+67%
L2 Cache	256K (per core)	256 kB (per core)
Process	14 nm	14 nm
Architecture	Comet Lake (2020−2025)	Broadwell-E (2016)
PassMark	13,029	14,682+13%
Cinebench R23 Multi	8,191	—
Geekbench 6 Single	1,454+14%	1,273
Geekbench 6 Multi	5,783	7,591+31%

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Memory & Platform

The Core i5-10400F uses the LGA1200 socket (PCIe 3.0), while the Core i7-6900K uses LGA2011 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2666 on the Core i5-10400F versus DDR4-2400 on the Core i7-6900K — the Core i5-10400F supports 11.1% faster memory, which can translate to measurable gains in memory-sensitive workloads. Both support up to 128 GB of RAM. Memory channels: 2 (Core i5-10400F) vs 4 (Core i7-6900K). PCIe lanes: 16 (Core i5-10400F) vs 40 (Core i7-6900K) — the Core i7-6900K offers 24 more lanes for additional GPUs or NVMe drives. Chipset compatibility: H410,B460,H470,Z490,H510,B560,H570,Z590 (Core i5-10400F) and X99 (Core i7-6900K).

Feature	Core i5-10400F	Core i7-6900K
Socket	LGA1200	LGA2011
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	DDR4-2666+11%	DDR4-2400
Max RAM Capacity	128 GB	128 GB
RAM Channels	2	4+100%
ECC Support	No	No
PCIe Lanes	16	40+150%

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Advanced Features

Only the Core i7-6900K has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Both support VT-x, VT-d virtualization. Primary use case: Core i5-10400F targets Gaming, Core i7-6900K targets High-End Desktop. Direct competitor: Core i5-10400F rivals Ryzen 5 3600.

Feature	Core i5-10400F	Core i7-6900K
Integrated GPU	No	No
IGPU Model	—	None
Unlocked	No	Yes
AVX-512	No	No
Virtualization	VT-x, VT-d	VT-x, VT-d
Target Use	Gaming	High-End Desktop

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Value Analysis

At launch, the Core i5-10400F was priced at $160, while the Core i7-6900K came in at $1089. On launch pricing ($160 vs $1089), Core i5-10400F was $929 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i5-10400F delivers 81.4 pts/$ vs 13.5 pts/$ for the Core i7-6900K — making the Core i5-10400F the 143.2% better value option.

Feature	Core i5-10400F	Core i7-6900K
MSRP	$160-85%	$1089
Performance per Dollar	81.4+503%	13.5
Release Date	2020	2016

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