Core i7-9800X vs Core i9-9900K

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 i7-9800X vs Core i9-9900K 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 i7-9800X vs Core i9-9900K: Pros, Cons & Final Verdict

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

Core i7-9800X

2018

Why buy it

✅+0.1% higher PassMark.
✅175% more PCIe lanes (44 vs 16) for storage and expansion-heavy builds.

Trade-offs

❌Worse for gaming: lower average FPS than Core i9-9900K across 50 shared CPU benchmark tests.
❌Lower PassMark per dollar, at 30.8 vs 37.1 PassMark/$ ($589 MSRP vs $488 MSRP).
❌73.7% higher power demand at 165W vs 95W.
❌No integrated graphics, while Core i9-9900K can still boot and troubleshoot without a discrete GPU.

Core i9-9900K

2018

Why buy it

✅Better for gaming: +14.3% higher average FPS across 50 shared CPU benchmark tests.
✅Costs $101 less on MSRP ($488 MSRP vs $589 MSRP).
✅Delivers 20.6% more PassMark for each dollar spent, at 37.1 vs 30.8 PassMark/$ ($488 MSRP vs $589 MSRP).
✅Draws 95W instead of 165W, a 70W reduction.
✅Integrated graphics onboard with Intel UHD Graphics 630, while Core i7-9800X needs a discrete GPU.

Trade-offs

❌Lower PassMark (18,109 vs 18,128).

Quick Answers

So, is Core i9-9900K better than Core i7-9800X?

It depends on what you want from the system. For gaming, Core i9-9900K is ahead with a 14.3% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Core i7-9800X pulls ahead with 0.1% better PassMark.

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

For streaming, content creation, and heavier multitasking, Core i7-9800X is the stronger fit. You are getting 0.1% better PassMark, backed by 8 cores and 16 threads.

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

Core i9-9900K is the better buy right now. Core i9-9900K comes in $101 cheaper on MSRP at $488 MSRP versus $589 MSRP, and it still gives you a 14.3% average FPS lead across 50 shared CPU game tests in our data. The compromise is that Core i7-9800X is still stronger for heavier multi-core work with 0.1% better PassMark. It is also 20.6% better value on MSRP (37.1 vs 30.8 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Core i7-9800X makes more sense long term for 2026 and beyond. You are getting more multi-core headroom with 8 cores / 16 threads instead of 8/16. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Core i7-9800X vs Core i9-9900K Technical Specifications

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

Core i7-9800X

The Core i7-9800X is manufactured by Intel. It was released in 19 October 2018 (7 years ago). It is based on the Skylake (server) (2017−2018) architecture. It features 8 cores and 16 threads. Base frequency is 3.8 GHz, with boost up to 4.5 GHz. L3 cache: 16.5 MB (total). L2 cache: 1 MB (per core). Built on 14 nm process technology. Socket: LGA2066. Thermal design power (TDP): 165 Watt. Memory support: DDR4-2666. Passmark benchmark score: 18,128 points. Launch price was $589.

Core i9-9900K

The Core i9-9900K is manufactured by Intel. It was released in 19 October 2018 (7 years ago). It is based on the Coffee Lake-R (2018−2019) architecture. It features 8 cores and 16 threads. Base frequency is 3.6 GHz, with boost up to 5 GHz. L3 cache: 16 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: LGA1151. Thermal design power (TDP): 95 Watt. Memory support: DDR4. Passmark benchmark score: 18,109 points. Launch price was $488.

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Processing Power

Both the Core i7-9800X and Core i9-9900K share an identical 8-core/16-thread configuration. Boost clocks reach 4.5 GHz on the Core i7-9800X versus 5 GHz on the Core i9-9900K — a 10.5% clock advantage for the Core i9-9900K (base: 3.8 GHz vs 3.6 GHz). The Core i7-9800X uses the Skylake (server) (2017−2018) architecture (14 nm), while the Core i9-9900K uses Coffee Lake-R (2018−2019) (14 nm). In PassMark, the Core i7-9800X scores 18,128 against the Core i9-9900K's 18,109 — a 0.1% lead for the Core i7-9800X. L3 cache: 16.5 MB (total) on the Core i7-9800X vs 16 MB (total) on the Core i9-9900K.

Feature	Core i7-9800X	Core i9-9900K
Cores / Threads	8 / 16	8 / 16
Boost Clock	4.5 GHz	5 GHz+11%
Base Clock	3.8 GHz+6%	3.6 GHz
L3 Cache	16.5 MB (total)+3%	16 MB (total)
L2 Cache	1 MB (per core)	256K (per core)+25500%
Process	14 nm	14 nm
Architecture	Skylake (server) (2017−2018)	Coffee Lake-R (2018−2019)
PassMark	18,128	18,109
Cinebench R23 Multi	13,067	—
Geekbench 6 Single	1,372	—
Geekbench 6 Multi	7,552	—

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Memory & Platform

The Core i7-9800X uses the LGA2066 socket (PCIe 3.0), while the Core i9-9900K uses LGA1151 (PCIe 3.0) — making them incompatible on the same motherboard. Both support up to DDR4-2666 memory speed. Both support up to 128 GB of RAM. Memory channels: 4 (Core i7-9800X) vs 2 (Core i9-9900K). PCIe lanes: 44 (Core i7-9800X) vs 16 (Core i9-9900K) — the Core i7-9800X offers 28 more lanes for additional GPUs or NVMe drives. Chipset compatibility: X299 (Core i7-9800X) and Intel 300 series (Core i9-9900K).

Feature	Core i7-9800X	Core i9-9900K
Socket	LGA2066	LGA1151
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	DDR4-2666	DDR4-2666
Max RAM Capacity	128 GB	128 GB
RAM Channels	4+100%	2
ECC Support	No	No
PCIe Lanes	44+175%	16

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Advanced Features

Virtualization: VT-x, VT-d (Core i7-9800X) / not specified (Core i9-9900K). The Core i9-9900K includes integrated graphics (Intel UHD Graphics 630), while the Core i7-9800X requires a dedicated GPU. Primary use case: Core i7-9800X targets Workstation. Direct competitor: Core i7-9800X rivals Ryzen 5 3600XT.

Feature	Core i7-9800X	Core i9-9900K
Integrated GPU	No	Yes
IGPU Model	—	Intel UHD Graphics 630
Unlocked	Yes	—
AVX-512	Yes	—
Virtualization	VT-x, VT-d	—
Target Use	Workstation	—

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Value Analysis

At launch, the Core i7-9800X was priced at $589, while the Core i9-9900K came in at $488. On launch pricing ($589 vs $488), Core i9-9900K was $101 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i7-9800X delivers 30.8 pts/$ vs 37.1 pts/$ for the Core i9-9900K — making the Core i9-9900K the 18.7% better value option.

Feature	Core i7-9800X	Core i9-9900K
MSRP	$589	$488-17%
Performance per Dollar	30.8	37.1+20%
Release Date	2018	2018

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