Celeron 3955U vs Pentium G645

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.

Celeron 3955U vs Pentium G645 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.

Celeron 3955U vs Pentium G645: Pros, Cons & Final Verdict

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

Celeron 3955U

2015

Why buy it

✅Draws 15W instead of 65W, a 50W reduction.
✅100+% more PCIe lanes (12 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with HD Graphics 510, while Pentium G645 needs a discrete GPU.

Trade-offs

❌Lower PassMark (1,443 vs 1,450).
❌Smaller total L3 cache (2 MB vs 3 MB).

Pentium G645

2012

Why buy it

✅+50% larger total L3 cache (3 MB vs 2 MB).

Trade-offs

❌Launch MSRP is still $80 MSRP, while Celeron 3955U mostly shows up through inconsistent older-market listings.
❌333.3% higher power demand at 65W vs 15W.
❌No integrated graphics, while Celeron 3955U can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Pentium G645 better than Celeron 3955U?

Yes. Pentium G645 is the better all-around CPU here. It gives you a 0.3% average FPS lead across 50 shared CPU game tests in our data and 0.5% better PassMark, which is enough to make it the stronger overall pick.

Which one is better for gaming?

If gaming is the priority, Pentium G645 is the better pick. According to our tests, it delivers 0.3% 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, Pentium G645 is the stronger fit. You are getting 0.5% better PassMark, backed by 2 cores and 2 threads. It also has the larger cache pool with 50% larger total L3 cache (3 MB vs 2 MB).

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

Pentium G645 is the better buy right now. Pentium G645 comes in at an unclear MSRP at $80 MSRP versus unclear MSRP, and it still gives you a 0.3% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (18.1 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Celeron 3955U makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2015 vs 2012). That makes it the safer long-term bet.

Celeron 3955U vs Pentium G645 Technical Specifications

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

Celeron 3955U

The Celeron 3955U is manufactured by Intel. It was released in 15 August 2015 (10 years ago). It is based on the Skylake (2015−2016) architecture. It features 2 cores and 2 threads. Base frequency is 2 GHz, with boost up to 2 GHz. L3 cache: 2 MB. L2 cache: 512 kB. Built on 14 nm process technology. Socket: BGA1356. Thermal design power (TDP): 15 Watt. Memory support: DDR4-1866/2133, LPDDR3-1600/1866, DDR3L-1333/1600. Passmark benchmark score: 1,443 points. Launch price was $107.

Pentium G645

The Pentium G645 is manufactured by Intel. It was released in 2 September 2012 (13 years ago). It is based on the Sandy Bridge (2011−2013) architecture. It features 2 cores and 2 threads. Base frequency is 2.9 GHz, with boost up to 2.9 GHz. L3 cache: 3 MB (total). L2 cache: 256 kB (per core). Built on 32 nm process technology. Socket: LGA1155. Thermal design power (TDP): 65 Watt. Memory support: DDR3. Passmark benchmark score: 1,450 points. Launch price was $80.

⚡

Processing Power

Both the Celeron 3955U and Pentium G645 share an identical 2-core/2-thread configuration. Boost clocks reach 2 GHz on the Celeron 3955U versus 2.9 GHz on the Pentium G645 — a 36.7% clock advantage for the Pentium G645 (base: 2 GHz vs 2.9 GHz). The Celeron 3955U uses the Skylake (2015−2016) architecture (14 nm), while the Pentium G645 uses Sandy Bridge (2011−2013) (32 nm). In PassMark, the Celeron 3955U scores 1,443 against the Pentium G645's 1,450 — a 0.5% lead for the Pentium G645. L3 cache: 2 MB on the Celeron 3955U vs 3 MB (total) on the Pentium G645.

Feature	Celeron 3955U	Pentium G645
Cores / Threads	2 / 2	2 / 2
Boost Clock	2 GHz	2.9 GHz+45%
Base Clock	2 GHz	2.9 GHz+45%
L3 Cache	2 MB	3 MB (total)+50%
L2 Cache	512 kB+100%	256 kB (per core)
Process	14 nm-56%	32 nm
Architecture	Skylake (2015−2016)	Sandy Bridge (2011−2013)
PassMark	1,443	1,450
Geekbench 6 Single	431	—
Geekbench 6 Multi	741	—

🧠

Memory & Platform

The Celeron 3955U uses the BGA1356 socket (PCIe 3.0), while the Pentium G645 uses LGA1155 (PCIe 2.0) — making them incompatible on the same motherboard.

Feature	Celeron 3955U	Pentium G645
Socket	BGA1356	LGA1155
PCIe Generation	PCIe 3.0+50%	PCIe 2.0
Max RAM Speed	DDR4-2133	—
Max RAM Capacity	32 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	12	—

🔧

Advanced Features

Virtualization: VT-x, VT-d (Celeron 3955U) / not specified (Pentium G645). The Celeron 3955U includes integrated graphics (HD Graphics 510), while the Pentium G645 requires a dedicated GPU. Primary use case: Celeron 3955U targets Budget. Direct competitor: Celeron 3955U rivals Pentium 3825U.