Core i3-1215U vs Core i5-8600K

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 i3-1215U vs Core i5-8600K 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 i3-1215U vs Core i5-8600K: Pros, Cons & Final Verdict

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

Core i3-1215U

2022

Why buy it

✅Better for gaming: +9.8% higher average FPS across 50 shared CPU benchmark tests.
✅Draws 15W instead of 95W, a 80W reduction.
✅Newer platform on FCBGA1744 with DDR5 support instead of LGA1151 and DDR4.
✅25% more PCIe lanes (20 vs 16) for storage and expansion-heavy builds.

Trade-offs

❌Fewer obvious downsides in this matchup outside of normal market pricing swings.

Core i5-8600K

2017

Why buy it

Trade-offs

❌Worse for gaming: lower average FPS than Core i3-1215U across 50 shared CPU benchmark tests.
❌Lower PassMark (10,134 vs 10,281).
❌Launch MSRP is still $257 MSRP, while Core i3-1215U mostly shows up through inconsistent older-market listings.
❌533.3% higher power demand at 95W vs 15W.
❌Older platform position on LGA1151 with DDR4, while Core i3-1215U moves to FCBGA1744 and DDR5.

Quick Answers

So, is Core i3-1215U better than Core i5-8600K?

Yes. Core i3-1215U is the better all-around CPU here. It gives you a 9.8% average FPS lead across 50 shared CPU game tests in our data, 1.5% 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 i3-1215U is the better pick. According to our tests, it delivers 9.8% 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 i3-1215U is the stronger fit. You are getting 1.5% better PassMark, backed by 6 cores and 8 threads.

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

Core i3-1215U is still the much better call for a fresh build. Core i3-1215U comes in at an unclear MSRP at unclear MSRP versus $257 MSRP, and it still gives you a 9.8% average FPS lead across 50 shared CPU game tests in our data. Core i5-8600K only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2017 platform. Even with 100.0% better value on paper (39.4 vs 0.0 PassMark/$), it really only makes sense as a cheap stopgap or a niche existing-platform option for someone already on LGA1151.

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

Core i3-1215U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2022 vs 2017), a healthier platform with FCBGA1744 and DDR5 instead of LGA1151, and more multi-core headroom with 6 cores / 8 threads instead of 6/6. That gives you a healthier platform runway for motherboard, RAM, and later CPU upgrades.

Core i3-1215U vs Core i5-8600K Technical Specifications

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

Core i3-1215U

The Core i3-1215U is manufactured by Intel. It was released in 23 February 2022 (3 years ago). It is based on the Alder Lake-U (2022) architecture. It features 6 cores and 8 threads. Base frequency is 1.2 GHz, with boost up to 4.4 GHz. L3 cache: 10 MB (total). L2 cache: 1.25 MB (per core). Built on Intel 7 nm process technology. Socket: FCBGA1744. Thermal design power (TDP): 15 Watt. Memory support: DDR4, DDR5. Passmark benchmark score: 10,281 points. Launch price was $149.

Core i5-8600K

The Core i5-8600K is manufactured by Intel. It was released in 5 October 2017 (8 years ago). It is based on the Coffee Lake-S (2017−2018) architecture. It features 6 cores and 6 threads. Base frequency is 3.6 GHz, with boost up to 4.3 GHz. L3 cache: 9 MB (total). L2 cache: 256K (per core). Built on 14 nm process technology. Socket: LGA1151. Thermal design power (TDP): 95 Watt. Memory support: DDR3, DDR4. Passmark benchmark score: 10,134 points. Launch price was $257.

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Processing Power

The Core i3-1215U packs 6 cores / 8 threads, matching the Core i5-8600K's 6 cores. Boost clocks reach 4.4 GHz on the Core i3-1215U versus 4.3 GHz on the Core i5-8600K — a 2.3% clock advantage for the Core i3-1215U (base: 1.2 GHz vs 3.6 GHz). The Core i3-1215U uses the Alder Lake-U (2022) architecture (Intel 7 nm), while the Core i5-8600K uses Coffee Lake-S (2017−2018) (14 nm). In PassMark, the Core i3-1215U scores 10,281 against the Core i5-8600K's 10,134 — a 1.4% lead for the Core i3-1215U. Geekbench 6 single-core — the metric most relevant to gaming — records 2,079 vs 1,550, a 29.2% lead for the Core i3-1215U that directly translates to higher frame rates. L3 cache: 10 MB (total) on the Core i3-1215U vs 9 MB (total) on the Core i5-8600K.

Feature	Core i3-1215U	Core i5-8600K
Cores / Threads	6 / 8	6 / 6
Boost Clock	4.4 GHz+2%	4.3 GHz
Base Clock	1.2 GHz	3.6 GHz+200%
L3 Cache	10 MB (total)+11%	9 MB (total)
L2 Cache	1.25 MB (per core)	256K (per core)+20380%
Process	Intel 7 nm-50%	14 nm
Architecture	Alder Lake-U (2022)	Coffee Lake-S (2017−2018)
PassMark	10,281+1%	10,134
Geekbench 6 Single	2,079+34%	1,550

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Memory & Platform

The Core i3-1215U uses the FCBGA1744 socket (PCIe 5.0), while the Core i5-8600K uses LGA1151 (PCIe 3.0) — making them incompatible on the same motherboard. Maximum memory speed reaches LPDDR5-5200 on the Core i3-1215U versus DDR4-2666 on the Core i5-8600K — the Core i3-1215U supports 95% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Core i5-8600K 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. PCIe lanes: 20 (Core i3-1215U) vs 16 (Core i5-8600K) — the Core i3-1215U offers 4 more lanes for additional GPUs or NVMe drives.

Feature	Core i3-1215U	Core i5-8600K
Socket	FCBGA1744	LGA1151
PCIe Generation	PCIe 5.0+67%	PCIe 3.0
Max RAM Speed	LPDDR5-5200+95%	DDR4-2666
Max RAM Capacity	64 GB	128 GB+100%
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	20+25%	16

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Advanced Features

Only the Core i5-8600K has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Both support VT-x, VT-d, EPT virtualization. Both include integrated graphics — UHD Graphics for 12th Gen (64 EU) (Core i3-1215U) and UHD Graphics 630 (Core i5-8600K) — useful as a fallback for troubleshooting or display output without a dedicated GPU. Primary use case: Core i3-1215U targets Mainstream Laptop, Core i5-8600K targets Gaming Desktop. Direct competitor: Core i3-1215U rivals Ryzen 3 5425U; Core i5-8600K rivals Ryzen 5 2600X.

Feature	Core i3-1215U	Core i5-8600K
Integrated GPU	Yes	Yes
IGPU Model	UHD Graphics for 12th Gen (64 EU)	UHD Graphics 630
Unlocked	No	Yes
AVX-512	No	No
Virtualization	VT-x, VT-d, EPT	VT-x, VT-d, EPT
Target Use	Mainstream Laptop	Gaming Desktop