Core i5-1155G7 vs Core i7-5820K

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 i5-1155G7 vs Core i7-5820K 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 i5-1155G7 vs Core i7-5820K: Pros, Cons & Final Verdict

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

Core i5-1155G7

2021

Why buy it

✅Draws 28W instead of 140W, a 112W reduction.

Trade-offs

❌Lower PassMark (9,686 vs 9,826).
❌Smaller total L3 cache (8 MB vs 15 MB).

Core i7-5820K

2014

Why buy it

✅+1.4% higher PassMark.
✅+87.5% larger total L3 cache (15 MB vs 8 MB).
✅100+% more PCIe lanes (28 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌Launch MSRP is still $389 MSRP, while Core i5-1155G7 mostly shows up through inconsistent older-market listings.
❌400% higher power demand at 140W vs 28W.

Quick Answers

So, is Core i5-1155G7 better than Core i7-5820K?

It depends on what you want from the system. For gaming, Core i5-1155G7 is ahead with a 0.2% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Core i7-5820K pulls ahead with 1.4% better PassMark. Core i7-5820K also has the bigger cache pool with 87.5% larger total L3 cache (15 MB vs 8 MB).

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

For streaming, content creation, and heavier multitasking, Core i7-5820K is the stronger fit. You are getting 1.4% better PassMark, backed by 6 cores and 12 threads. It also has the larger cache pool with 87.5% larger total L3 cache (15 MB vs 8 MB).

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

Core i5-1155G7 is still the much better call for a fresh build. Core i5-1155G7 comes in at an unclear MSRP at unclear MSRP versus $389 MSRP, and it still gives you a 0.2% average FPS lead across 50 shared CPU game tests in our data. Core i7-5820K only looks stronger on raw value math because it is extremely cheap, but that usually means used-market pricing on an obsolete 2014 platform. Even with 100.0% better value on paper (25.3 vs 0.0 PassMark/$), it really only makes sense as a cheap stopgap or a niche existing-platform option for someone already on LGA2011.

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

Core i5-1155G7 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2021 vs 2014). That makes it the safer long-term bet.

Core i5-1155G7 vs Core i7-5820K Technical Specifications

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

Core i5-1155G7

The Core i5-1155G7 is manufactured by Intel. It was released in 31 May 2021 (4 years ago). It is based on the Tiger Lake-UP3 (2020−2021) architecture. It features 4 cores and 8 threads. Base frequency is 2.5 GHz, with boost up to 4.5 GHz. L3 cache: 8 MB (total). L2 cache: 1.25 MB (per core). Built on 10 nm SuperFin process technology. Socket: FCBGA1449. Thermal design power (TDP): 28 Watt. Memory support: DDR4. Passmark benchmark score: 9,686 points. Launch price was $309.

Core i7-5820K

The Core i7-5820K is manufactured by Intel. It was released in 1 September 2014 (11 years ago). It is based on the Haswell-E (2014) architecture. It features 6 cores and 12 threads. Base frequency is 3.3 GHz, with boost up to 3.6 GHz. L3 cache: 15 MB (total). L2 cache: 256 kB (per core). Built on 22 nm process technology. Socket: LGA2011. Thermal design power (TDP): 140 Watt. Memory support: DDR4. Passmark benchmark score: 9,826 points. Launch price was $410.

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Processing Power

The Core i5-1155G7 packs 4 cores / 8 threads, while the Core i7-5820K offers 6 cores / 12 threads — the Core i7-5820K has 2 more cores. Boost clocks reach 4.5 GHz on the Core i5-1155G7 versus 3.6 GHz on the Core i7-5820K — a 22.2% clock advantage for the Core i5-1155G7 (base: 2.5 GHz vs 3.3 GHz). The Core i5-1155G7 uses the Tiger Lake-UP3 (2020−2021) architecture (10 nm SuperFin), while the Core i7-5820K uses Haswell-E (2014) (22 nm). In PassMark, the Core i5-1155G7 scores 9,686 against the Core i7-5820K's 9,826 — a 1.4% lead for the Core i7-5820K. L3 cache: 8 MB (total) on the Core i5-1155G7 vs 15 MB (total) on the Core i7-5820K.

Feature	Core i5-1155G7	Core i7-5820K
Cores / Threads	4 / 8	6 / 12+50%
Boost Clock	4.5 GHz+25%	3.6 GHz
Base Clock	2.5 GHz	3.3 GHz+32%
L3 Cache	8 MB (total)	15 MB (total)+88%
L2 Cache	1.25 MB (per core)+400%	256 kB (per core)
Process	10 nm SuperFin-55%	22 nm
Architecture	Tiger Lake-UP3 (2020−2021)	Haswell-E (2014)
PassMark	9,686	9,826+1%
Cinebench R23 Multi	—	5,700
Geekbench 6 Single	—	1,134
Geekbench 6 Multi	—	5,383

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Memory & Platform

The Core i5-1155G7 uses the FCBGA1449 socket (PCIe 4.0), while the Core i7-5820K uses LGA2011 (PCIe 3.0) — making them incompatible on the same motherboard.

Feature	Core i5-1155G7	Core i7-5820K
Socket	FCBGA1449	LGA2011
PCIe Generation	PCIe 4.0+33%	PCIe 3.0
Max RAM Speed	—	DDR4-2133
Max RAM Capacity	—	64 GB
RAM Channels	—	4
ECC Support	—	No
PCIe Lanes	—	28

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Advanced Features

Virtualization: not specified (Core i5-1155G7) / Yes (Core i7-5820K). Primary use case: Core i7-5820K targets Enthusiast Workstation. Direct competitor: Core i7-5820K rivals Ryzen 5 1600.