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 i7-8665UE vs Core i7-9700K 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 i7-8665UE vs Core i7-9700K: Pros, Cons & Final Verdict

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

Core i7-8665UE

2018

Why buy it

✅Draws 15W instead of 95W, a 80W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Core i7-9700K across 50 shared CPU benchmark tests.
❌Lower PassMark (4,852 vs 14,397).
❌Smaller total L3 cache (8 MB vs 12 MB).
❌Lower PassMark per dollar, at 11.9 vs 37.4 PassMark/$ ($409 MSRP vs $385 MSRP).

Core i7-9700K

2018

Why buy it

✅Better for gaming: +126.7% higher average FPS across 50 shared CPU benchmark tests.
✅+50% larger total L3 cache (12 MB vs 8 MB).
✅Costs $24 less on MSRP ($385 MSRP vs $409 MSRP).
✅Delivers 215.2% more PassMark for each dollar spent, at 37.4 vs 11.9 PassMark/$ ($385 MSRP vs $409 MSRP).

Trade-offs

❌533.3% higher power demand at 95W vs 15W.

Quick Answers

So, is Core i7-9700K better than Core i7-8665UE?

Yes. Core i7-9700K is the better all-around CPU here. It gives you a 126.7% average FPS lead across 50 shared CPU game tests in our data, 196.7% better PassMark, and the stronger long-term platform, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Core i7-9700K is the better pick. According to our tests, it delivers 126.7% 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 i7-9700K is the stronger fit. You are getting 196.7% better PassMark, backed by 8 cores and 8 threads. It also has the larger cache pool with 50% larger total L3 cache (12 MB vs 8 MB).

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

Core i7-9700K is the better buy right now. Core i7-9700K comes in $24 cheaper on MSRP at $385 MSRP versus $409 MSRP, and it still gives you a 126.7% average FPS lead across 50 shared CPU game tests in our data. It is also 215.2% better value on MSRP (37.4 vs 11.9 PassMark/$), 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 i7-9700K makes more sense long term for 2026 and beyond. You are getting 50% larger total L3 cache (12 MB vs 8 MB) and more multi-core headroom with 8 cores / 8 threads instead of 4/8. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Core i7-8665UE vs Core i7-9700K Technical Specifications

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

Core i7-8665UE

The Core i7-8665UE is manufactured by Intel. It was released in 1 October 2018 (7 years ago). It is based on the Whiskey Lake-U (2018−2019) architecture. It features 4 cores and 8 threads. Base frequency is 1.7 GHz, with boost up to 4.4 GHz. L3 cache: 8 MB (total). L2 cache: 256 kB (per core). Built on 14 nm process technology. Socket: FCBGA1528. Thermal design power (TDP): 15 Watt. Memory support: DDR3, DDR4. Passmark benchmark score: 4,852 points. Launch price was $409.

Core i7-9700K

The Core i7-9700K 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 8 threads. Base frequency is 3.6 GHz, with boost up to 4.9 GHz. L3 cache: 12 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: 14,397 points. Launch price was $374.

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Processing Power

The Core i7-8665UE packs 4 cores / 8 threads, while the Core i7-9700K offers 8 cores / 8 threads — the Core i7-9700K has 4 more cores. Boost clocks reach 4.4 GHz on the Core i7-8665UE versus 4.9 GHz on the Core i7-9700K — a 10.8% clock advantage for the Core i7-9700K (base: 1.7 GHz vs 3.6 GHz). The Core i7-8665UE uses the Whiskey Lake-U (2018−2019) architecture (14 nm), while the Core i7-9700K uses Coffee Lake-R (2018−2019) (14 nm). In PassMark, the Core i7-8665UE scores 4,852 against the Core i7-9700K's 14,397 — a 99.2% lead for the Core i7-9700K. L3 cache: 8 MB (total) on the Core i7-8665UE vs 12 MB (total) on the Core i7-9700K.

Feature	Core i7-8665UE	Core i7-9700K
Cores / Threads	4 / 8	8 / 8+100%
Boost Clock	4.4 GHz	4.9 GHz+11%
Base Clock	1.7 GHz	3.6 GHz+112%
L3 Cache	8 MB (total)	12 MB (total)+50%
L2 Cache	256 kB (per core)	256K (per core)
Process	14 nm	14 nm
Architecture	Whiskey Lake-U (2018−2019)	Coffee Lake-R (2018−2019)
PassMark	4,852	14,397+197%

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Memory & Platform

The Core i7-8665UE uses the FCBGA1528 socket (PCIe 3.0), while the Core i7-9700K uses LGA1151 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-2400 on the Core i7-8665UE versus DDR4-2666 on the Core i7-9700K — the Core i7-9700K supports 11.1% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i7-9700K supports up to 128 GB of RAM compared to 64 GB — 100% more capacity for professional workloads. Both feature 2-channel memory with ECC support. Both provide 16 PCIe lanes.

Feature	Core i7-8665UE	Core i7-9700K
Socket	FCBGA1528	LGA1151
PCIe Generation	PCIe 3.0	PCIe 3.0
Max RAM Speed	DDR4-2400	DDR4-2666+11%
Max RAM Capacity	64 GB	128 GB+100%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	16	16

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Advanced Features

Only the Core i7-9700K has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Both support VT-x, VT-d virtualization. Both include integrated graphics — UHD Graphics 620 (Core i7-8665UE) and UHD Graphics 630 (Core i7-9700K) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i7-8665UE targets Embedded, Core i7-9700K targets Desktop.

Feature	Core i7-8665UE	Core i7-9700K
Integrated GPU	Yes	Yes
IGPU Model	UHD Graphics 620	UHD Graphics 630
Unlocked	No	Yes
AVX-512	No	No
Virtualization	VT-x, VT-d	VT-x, VT-d
Target Use	Embedded	Desktop

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Value Analysis

At launch, the Core i7-8665UE was priced at $409, while the Core i7-9700K came in at $385. On launch pricing ($409 vs $385), Core i7-9700K was $24 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i7-8665UE delivers 11.9 pts/$ vs 37.4 pts/$ for the Core i7-9700K — making the Core i7-9700K the 103.7% better value option.

Feature	Core i7-8665UE	Core i7-9700K
MSRP	$409	$385-6%
Performance per Dollar	11.9	37.4+214%
Release Date	2018	2018

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