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 6305 vs Core 2 Quad Q8400 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 6305 vs Core 2 Quad Q8400: Pros, Cons & Final Verdict

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

Celeron 6305

2020

Why buy it

✅+101.6% higher Geekbench single-core performance for gaming and desktop responsiveness.
✅Costs $76 less on MSRP ($107 MSRP vs $183 MSRP).
✅Delivers 71.1% more PassMark for each dollar spent, at 19.4 vs 11.3 PassMark/$ ($107 MSRP vs $183 MSRP).
✅Draws 3W instead of 95W, a 93W reduction.
✅100+% more PCIe lanes (4 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌No boxed cooler included, unlike Core 2 Quad Q8400.

Core 2 Quad Q8400

2009

Why buy it

✅Includes a boxed cooler (true), unlike Celeron 6305.

Trade-offs

❌Lower Geekbench single-core performance for gaming (369 vs 744).
❌Lower Geekbench multi-core (1,155 vs 1,236).
❌Lower PassMark per dollar, at 11.3 vs 19.4 PassMark/$ ($183 MSRP vs $107 MSRP).
❌3700% higher power demand at 95W vs 2.5W.
❌No integrated graphics, while Celeron 6305 can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Celeron 6305 better than Core 2 Quad Q8400?

Yes. Celeron 6305 is the better all-around CPU here. It gives you a 1.9% average FPS lead across 50 shared CPU game tests in our data, 7% better Geekbench multi-core, 0.0% higher 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, Celeron 6305 is the better pick. According to our tests, it delivers 1.9% 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, Celeron 6305 is the stronger fit. You are getting 7% better Geekbench multi-core, backed by 2 cores and 2 threads.

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

Celeron 6305 is the better buy right now. Celeron 6305 comes in $76 cheaper on MSRP at $107 MSRP versus $183 MSRP, and it still gives you a 1.9% average FPS lead across 50 shared CPU game tests in our data. It is also 71.1% better value on MSRP (19.4 vs 11.3 PassMark/$), 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 6305 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2020 vs 2009) and more multi-core headroom with 2 cores / 2 threads instead of 4/4. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Celeron 6305 vs Core 2 Quad Q8400 Technical Specifications

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

Celeron 6305

The Celeron 6305 is manufactured by Intel. It was released in 2007-01-01. It is based on the Tiger Lake-U (2020−2021) architecture. It features 2 cores and 2 threads. Max frequency: 1.8 GHz. L3 cache: 4 MB. L2 cache: 2.5 MB. Built on 10 nm SuperFin process technology. Socket: FCBGA1449. Thermal design power (TDP): 2.5 MB + 4 MB. Memory support: DDR4. Passmark benchmark score: 2,077 points. Launch price was $69.

Core 2 Quad Q8400

The Core 2 Quad Q8400 is manufactured by Intel. It was released in 2008-01-01. It is based on the Yorkfield (2007−2009) architecture. It features 4 cores and 4 threads. Base frequency is 2.66 GHz, with boost up to 0.67 GHz. L3 cache: 0 kB. L2 cache: 4 MB (total). Built on 45 nm process technology. Socket: LGA775. Thermal design power (TDP): 95 Watt. Memory support: DDR1, DDR2, DDR3. Passmark benchmark score: 2,076 points. Launch price was $249.

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Processing Power

The Celeron 6305 packs 2 cores / 2 threads, while the Core 2 Quad Q8400 offers 4 cores / 4 threads — the Core 2 Quad Q8400 has 2 more cores. Boost clocks reach 1.8 GHz on the Celeron 6305 versus 0.67 GHz on the Core 2 Quad Q8400 — a 91.5% clock advantage for the Celeron 6305. The Celeron 6305 uses the Tiger Lake-U (2020−2021) architecture (10 nm SuperFin), while the Core 2 Quad Q8400 uses Yorkfield (2007−2009) (45 nm). In PassMark, the Celeron 6305 scores 2,077 against the Core 2 Quad Q8400's 2,076 — a 0% lead for the Celeron 6305. Geekbench 6 single-core — the metric most relevant to gaming — records 744 vs 369, a 67.4% lead for the Celeron 6305 that directly translates to higher frame rates. Multi-core Geekbench: 1,236 vs 1,155 (6.8% advantage for the Celeron 6305). L3 cache: 4 MB on the Celeron 6305 vs 0 kB on the Core 2 Quad Q8400.

Feature	Celeron 6305	Core 2 Quad Q8400
Cores / Threads	2 / 2	4 / 4+100%
Boost Clock	1.8 GHz+169%	0.67 GHz
Base Clock	—	2.66 GHz
L3 Cache	4 MB	0 kB
L2 Cache	2.5 MB	4 MB (total)+60%
Process	10 nm SuperFin-78%	45 nm
Architecture	Tiger Lake-U (2020−2021)	Yorkfield (2007−2009)
PassMark	2,077	2,076
Cinebench R23 Multi	—	852
Geekbench 6 Single	744+102%	369
Geekbench 6 Multi	1,236+7%	1,155

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Memory & Platform

The Celeron 6305 uses the FCBGA1449 socket (PCIe 4.0), while the Core 2 Quad Q8400 uses LGA775 (PCIe 1.1) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR4-3200 on the Celeron 6305 versus DDR3 1333 MHz on the Core 2 Quad Q8400 — the Celeron 6305 supports 140.1% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Celeron 6305 supports up to 64 GB of RAM compared to 16 GB — 300% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 4 (Celeron 6305) vs 0 (Core 2 Quad Q8400) — the Celeron 6305 offers 4 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Tiger Lake-U (Celeron 6305) and Intel P45,Intel G41,Intel Q45,Intel X48,Intel G31 (Core 2 Quad Q8400).

Feature	Celeron 6305	Core 2 Quad Q8400
Socket	FCBGA1449	LGA775
PCIe Generation	PCIe 4.0+264%	PCIe 1.1
Max RAM Speed	DDR4-3200+140%	DDR3 1333 MHz
Max RAM Capacity	64 GB+300%	16 GB
RAM Channels	2	2
ECC Support	No	No
PCIe Lanes	4	0

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Advanced Features

Neither processor supports overclocking. Virtualization support: VT-x, VT-d (Celeron 6305) vs true (Core 2 Quad Q8400). The Celeron 6305 includes integrated graphics (UHD Graphics for 11th Gen), while the Core 2 Quad Q8400 requires a dedicated GPU. Primary use case: Celeron 6305 targets Budget, Core 2 Quad Q8400 targets Desktop. Direct competitor: Celeron 6305 rivals Pentium Gold 7505.

Feature	Celeron 6305	Core 2 Quad Q8400
Integrated GPU	Yes	No
IGPU Model	UHD Graphics for 11th Gen	—
Unlocked	No	No
AVX-512	No	No
Virtualization	VT-x, VT-d	true
Target Use	Budget	Desktop

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Value Analysis

At launch, the Celeron 6305 was priced at $107, while the Core 2 Quad Q8400 came in at $183. On launch pricing ($107 vs $183), Celeron 6305 was $76 cheaper. In terms of value on MSRP (PassMark points per dollar), the Celeron 6305 delivers 19.4 pts/$ vs 11.3 pts/$ for the Core 2 Quad Q8400 — making the Celeron 6305 the 52.5% better value option.

Feature	Celeron 6305	Core 2 Quad Q8400
MSRP	$107-42%	$183
Performance per Dollar	19.4+72%	11.3
Release Date	2020	2009

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