Core i9-9900KF vs Core Ultra 7 255U

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 i9-9900KF vs Core Ultra 7 255U 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 i9-9900KF vs Core Ultra 7 255U: Pros, Cons & Final Verdict

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

Core i9-9900KF

2019

Why buy it

✅+1.1% higher PassMark.
✅+33.3% larger total L3 cache (16 MB vs 12 MB).
✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌Launch MSRP is still $488 MSRP, while Core Ultra 7 255U mostly shows up through inconsistent older-market listings.
❌578.6% higher power demand at 95W vs 14W.
❌Older platform position on LGA1151 with DDR4, while Core Ultra 7 255U moves to FCBGA2049 and DDR5.

Core Ultra 7 255U

2025

Why buy it

✅Draws 14W instead of 95W, a 81W reduction.
✅Newer platform on FCBGA2049 with DDR5 support instead of LGA1151 and DDR4.

Trade-offs

❌Lower PassMark (17,834 vs 18,029).
❌Smaller total L3 cache (12 MB vs 16 MB).

Quick Answers

So, is Core Ultra 7 255U better than Core i9-9900KF?

It depends on what you want from the system. For gaming, Core Ultra 7 255U is ahead with a 2.4% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Core i9-9900KF pulls ahead with 1.1% better PassMark. Core i9-9900KF also has the bigger cache pool with 33.3% larger total L3 cache (16 MB vs 12 MB).

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

For streaming, content creation, and heavier multitasking, Core i9-9900KF is the stronger fit. You are getting 1.1% better PassMark, backed by 8 cores and 16 threads. It also has the larger cache pool with 33.3% larger total L3 cache (16 MB vs 12 MB).

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

Core Ultra 7 255U is still the faster CPU overall, but Core i9-9900KF is easier to justify if budget matters more than peak performance. Core Ultra 7 255U comes in at an unclear MSRP at unclear MSRP versus $488 MSRP, and it still gives you a 2.4% average FPS lead across 50 shared CPU game tests in our data. The compromise is that Core i9-9900KF is still stronger for heavier multi-core work with 1.1% better PassMark. Core i9-9900KF is also 100.0% better value on MSRP (36.9 vs 0.0 PassMark/$), which is why it can still make sense for tighter-budget builds on paper.

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

Core Ultra 7 255U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2025 vs 2019) and a healthier platform with FCBGA2049 and DDR5 instead of LGA1151. That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

Core i9-9900KF vs Core Ultra 7 255U Technical Specifications

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

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.

Core Ultra 7 255U

The Core Ultra 7 255U is manufactured by Intel. It was released in 1 January 2025 (less than a year ago). It is based on the Arrow Lake-U (2025) architecture. It features 12 cores and 14 threads. Base frequency is 3.8 GHz, with boost up to 5.2 GHz. L3 cache: 12 MB. Built on 5 nm process technology. Socket: FCBGA2049. Thermal design power (TDP): 14 MB + 12 MB. Memory support: DDR5. Passmark benchmark score: 17,834 points. Launch price was $299.

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Processing Power

The Core i9-9900KF packs 8 cores / 16 threads, while the Core Ultra 7 255U offers 12 cores / 14 threads — the Core Ultra 7 255U has 4 more cores. Boost clocks reach 5 GHz on the Core i9-9900KF versus 5.2 GHz on the Core Ultra 7 255U — a 3.9% clock advantage for the Core Ultra 7 255U (base: 3.6 GHz vs 3.8 GHz). The Core i9-9900KF uses the Coffee Lake-R (2018−2019) architecture (14 nm), while the Core Ultra 7 255U uses Arrow Lake-U (2025) (5 nm). In PassMark, the Core i9-9900KF scores 18,029 against the Core Ultra 7 255U's 17,834 — a 1.1% lead for the Core i9-9900KF. L3 cache: 16 MB (total) on the Core i9-9900KF vs 12 MB on the Core Ultra 7 255U.

Feature	Core i9-9900KF	Core Ultra 7 255U
Cores / Threads	8 / 16	12 / 14+50%
Boost Clock	5 GHz	5.2 GHz+4%
Base Clock	3.6 GHz	3.8 GHz+6%
L3 Cache	16 MB (total)+33%	12 MB
L2 Cache	256K (per core)	—
Process	14 nm	5 nm-64%
Architecture	Coffee Lake-R (2018−2019)	Arrow Lake-U (2025)
PassMark	18,029+1%	17,834
Cinebench R23 Multi	12,812	—
Geekbench 6 Single	1,720	—
Geekbench 6 Multi	8,150	—

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Memory & Platform

The Core i9-9900KF uses the LGA1151 socket (PCIe 3.0), while the Core Ultra 7 255U uses FCBGA2049 (PCIe 5.0) — making them incompatible on the same motherboard.

Feature	Core i9-9900KF	Core Ultra 7 255U
Socket	LGA1151	FCBGA2049
PCIe Generation	PCIe 3.0	PCIe 5.0+67%
Max RAM Speed	DDR4-2666	—
Max RAM Capacity	128 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	16	—