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.

Head-to-Head Verdict, Benchmarks, Value & Long-Term Outlook

This comparison brings together gaming FPS, productivity performance, platform differences, power efficiency, pricing context, and upgrade path so you can see which CPU actually makes more sense.

Core i7-9800X

2018

Why buy it

✅+2% higher Cinebench R23 multi-core.
✅175% more PCIe lanes (44 vs 16) for storage and expansion-heavy builds.

Trade-offs

❌Worse for gaming: lower average FPS than Core i9-9900KF across 4 shared CPU benchmark tests.
❌Lower PassMark per dollar, at 30.8 vs 36.9 PassMark/$ ($589 MSRP vs $488 MSRP).
❌73.7% higher power demand at 165W vs 95W.

Core i9-9900KF

2019

Why buy it

✅Better for gaming: +18.9% higher average FPS across 4 shared CPU benchmark tests.
✅Costs $101 less on MSRP ($488 MSRP vs $589 MSRP).
✅Delivers 20.0% more PassMark for each dollar spent, at 36.9 vs 30.8 PassMark/$ ($488 MSRP vs $589 MSRP).
✅Draws 95W instead of 165W, a 70W reduction.

Trade-offs

❌Lower Cinebench R23 multi-core (12,812 vs 13,067).

Core i7-9800X

2018

Core i9-9900KF

2019

Why buy it

✅+2% higher Cinebench R23 multi-core.
✅175% more PCIe lanes (44 vs 16) for storage and expansion-heavy builds.

Why buy it

✅Better for gaming: +18.9% higher average FPS across 4 shared CPU benchmark tests.
✅Costs $101 less on MSRP ($488 MSRP vs $589 MSRP).
✅Delivers 20.0% more PassMark for each dollar spent, at 36.9 vs 30.8 PassMark/$ ($488 MSRP vs $589 MSRP).
✅Draws 95W instead of 165W, a 70W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Core i9-9900KF across 4 shared CPU benchmark tests.
❌Lower PassMark per dollar, at 30.8 vs 36.9 PassMark/$ ($589 MSRP vs $488 MSRP).
❌73.7% higher power demand at 165W vs 95W.

Trade-offs

❌Lower Cinebench R23 multi-core (12,812 vs 13,067).

Quick Answers

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

It depends on what matters more to you. For gaming, Core i9-9900KF is ahead with a 18.9% average FPS lead across 4 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Core i7-9800X pulls ahead with 2% better Cinebench R23 multi-core.

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

For streaming, content creation, and heavier multitasking, Core i7-9800X is the better fit. You are getting 2% better Cinebench R23 multi-core, backed by 8 cores and 16 threads.

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

Core i9-9900KF is the smarter buy today. Core i9-9900KF is $101 cheaper on MSRP at $488 MSRP versus $589 MSRP, and it gives you a 18.9% average FPS lead across 4 shared CPU game tests in our data. The trade-off is that Core i7-9800X is still stronger for heavier multi-core work with 2% better Cinebench R23 multi-core. It is also 20.0% better value on MSRP (36.9 vs 30.8 PassMark/$), so the better CPU is not just faster, it is also the cleaner value play on paper.

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

Core i9-9900KF is the more future-proof choice for 2026 and beyond. You are getting a newer CPU generation (2019 vs 2018). That makes it the safer long-term pick.

Games Benchmarks

Paired with RTX 4090

To accurately isolate CPU performance, all benchmarks below use an NVIDIA RTX 4090 as the reference GPU. This eliminates GPU-side bottlenecks and highlights pure processing throughput differences between the CPUs.

Note: Real-world results may vary based on your actual GPU. CPU performance impact is more visible in processing-intensive titles and high-refresh-rate gaming scenarios.

Core i7-9800X Benchmark Check

Core i9-9900KF Benchmark Check

Path of Exile 2

Preset	Core i7-9800X	Core i9-9900KF
1080p
low	206 FPS	301 FPS
medium	163 FPS	264 FPS
high	131 FPS	222 FPS
ultra	99 FPS	190 FPS
1440p
low	174 FPS	247 FPS
medium	135 FPS	195 FPS
high	108 FPS	159 FPS
ultra	82 FPS	140 FPS
4K
low	86 FPS	170 FPS
medium	72 FPS	136 FPS
high	57 FPS	105 FPS
ultra	45 FPS	92 FPS

Open Core i7-9800X Open Core i9-9900KF

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	Core i7-9800X	Core i9-9900KF
1080p
low	401 FPS	451 FPS
medium	329 FPS	451 FPS
high	287 FPS	451 FPS
ultra	254 FPS	405 FPS
1440p
low	354 FPS	451 FPS
medium	300 FPS	451 FPS
high	262 FPS	421 FPS
ultra	225 FPS	361 FPS
4K
low	248 FPS	400 FPS
medium	214 FPS	342 FPS
high	199 FPS	320 FPS
ultra	171 FPS	274 FPS

Open Core i7-9800X Open Core i9-9900KF

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	Core i7-9800X	Core i9-9900KF
1080p
low	453 FPS	451 FPS
medium	453 FPS	451 FPS
high	453 FPS	451 FPS
ultra	453 FPS	451 FPS
1440p
low	453 FPS	451 FPS
medium	453 FPS	451 FPS
high	453 FPS	451 FPS
ultra	394 FPS	451 FPS
4K
low	447 FPS	451 FPS
medium	361 FPS	451 FPS
high	325 FPS	425 FPS
ultra	258 FPS	354 FPS

Open Core i7-9800X Open Core i9-9900KF

League of Legends

League of Legends

Valorant

Preset	Core i7-9800X	Core i9-9900KF
1080p
low	453 FPS	451 FPS
medium	453 FPS	451 FPS
high	453 FPS	451 FPS
ultra	453 FPS	451 FPS
1440p
low	453 FPS	451 FPS
medium	453 FPS	451 FPS
high	453 FPS	451 FPS
ultra	453 FPS	451 FPS
4K
low	453 FPS	451 FPS
medium	453 FPS	451 FPS
high	453 FPS	451 FPS
ultra	437 FPS	437 FPS

Open Core i7-9800X Open Core i9-9900KF

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of Core i7-9800X and Core i9-9900KF

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 i9-9900KF

The Core i9-9900KF is manufactured by Intel. It was released in 8 January 2019 (6 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: DDR4-2666. Passmark benchmark score: 18,029 points. Launch price was $488.

⚡

Processing Power

Both the Core i7-9800X and Core i9-9900KF 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 i9-9900KF — a 10.5% clock advantage for the Core i9-9900KF (base: 3.8 GHz vs 3.6 GHz). The Core i7-9800X uses the Skylake (server) (2017−2018) architecture (14 nm), while the Core i9-9900KF uses Coffee Lake-R (2018−2019) (14 nm). In PassMark, the Core i7-9800X scores 18,128 against the Core i9-9900KF's 18,029 — a 0.5% lead for the Core i7-9800X. Cinebench R23 multi-core: 13,067 vs 12,812 (2% advantage for the Core i7-9800X). Geekbench 6 single-core — the metric most relevant to gaming — records 1,372 vs 1,720, a 22.5% lead for the Core i9-9900KF that directly translates to higher frame rates. Multi-core Geekbench: 7,552 vs 8,150 (7.6% advantage for the Core i9-9900KF). L3 cache: 16.5 MB (total) on the Core i7-9800X vs 16 MB (total) on the Core i9-9900KF.

Feature	Core i7-9800X	Core i9-9900KF
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)+300%	256K (per core)
Process	14 nm	14 nm
Architecture	Skylake (server) (2017−2018)	Coffee Lake-R (2018−2019)
PassMark	18,128	18,029
Cinebench R23 Multi	13,067+2%	12,812
Geekbench 6 Single	1,372	1,720+25%
Geekbench 6 Multi	7,552	8,150+8%

🧠

Memory & Platform

The Core i7-9800X uses the LGA2066 socket (PCIe 3.0), while the Core i9-9900KF 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 i9-9900KF). PCIe lanes: 44 (Core i7-9800X) vs 16 (Core i9-9900KF) — the Core i7-9800X offers 28 more lanes for additional GPUs or NVMe drives. Chipset compatibility: X299 (Core i7-9800X) and Z390,Z370,H370,B365,B360 (Core i9-9900KF).

Feature	Core i7-9800X	Core i9-9900KF
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

🔧

Advanced Features

Both processors feature an unlocked multiplier for overclocking. Only the Core i7-9800X supports AVX-512 instructions — important for machine learning and scientific applications. Both support VT-x, VT-d virtualization. Primary use case: Core i7-9800X targets Workstation, Core i9-9900KF targets Gaming. Direct competitor: Core i7-9800X rivals Ryzen 5 3600XT.

Feature	Core i7-9800X	Core i9-9900KF
Integrated GPU	No	No
Unlocked	Yes	Yes
AVX-512	Yes	No
Virtualization	VT-x, VT-d	VT-x, VT-d
Target Use	Workstation	Gaming

💰

Value Analysis

The Core i7-9800X launched at $589 MSRP, while the Core i9-9900KF debuted at $488. On MSRP ($589 vs $488), the Core i9-9900KF is $101 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i7-9800X delivers 30.8 pts/$ vs 36.9 pts/$ for the Core i9-9900KF — making the Core i9-9900KF the 18.2% better value option.