Core 2 Duo T5800 vs Core 2 Quad Q9300

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 2 Duo T5800 vs Core 2 Quad Q9300 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 2 Duo T5800 vs Core 2 Quad Q9300: Pros, Cons & Final Verdict

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

Core 2 Duo T5800

2008

Why buy it

✅Draws 2W instead of 95W, a 93W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Core 2 Quad Q9300 across 50 shared CPU benchmark tests.
❌Lower PassMark (2,000 vs 2,011).

Core 2 Quad Q9300

2008

Why buy it

✅Better for gaming: +3.7% higher average FPS across 50 shared CPU benchmark tests.
✅100+% more PCIe lanes (16 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌Launch MSRP is still $266 MSRP, while Core 2 Duo T5800 mostly shows up through inconsistent older-market listings.
❌4650% higher power demand at 95W vs 2W.

Quick Answers

So, is Core 2 Quad Q9300 better than Core 2 Duo T5800?

Yes. Core 2 Quad Q9300 is the better all-around CPU here. It gives you a 3.7% average FPS lead across 50 shared CPU game tests in our data, 0.5% 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 2 Quad Q9300 is the better pick. According to our tests, it delivers 3.7% 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 2 Quad Q9300 is the stronger fit. You are getting 0.5% better PassMark, backed by 4 cores and 4 threads.

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

Core 2 Quad Q9300 is the better buy right now. Core 2 Quad Q9300 comes in at an unclear MSRP at $266 MSRP versus unclear MSRP, and it still gives you a 3.7% average FPS lead across 50 shared CPU game tests in our data. It is also 100.0% better value on MSRP (7.6 vs 0.0 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Core 2 Quad Q9300 makes more sense long term for 2026 and beyond. You are getting more multi-core headroom with 4 cores / 4 threads instead of 2/2. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Core 2 Duo T5800 vs Core 2 Quad Q9300 Technical Specifications

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

Core 2 Duo T5800

The Core 2 Duo T5800 is manufactured by Intel. It was released in 2008-01-01. It is based on the Merom (2006−2008) 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. L2 cache: 2 MB. Built on 65 nm process technology. Socket: PGA478. Thermal design power (TDP): 35 Watt. Passmark benchmark score: 2,000 points. Launch price was $249.

Core 2 Quad Q9300

The Core 2 Quad Q9300 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 2.5 GHz, with boost up to 2.5 GHz. L3 cache: 0 kB. L2 cache: 6 MB (total). Built on 45 nm process technology. Socket: LGA775. Thermal design power (TDP): 95 Watt. Memory support: DDR1, DDR2, DDR3. Passmark benchmark score: 2,011 points. Launch price was $249.

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Processing Power

The Core 2 Duo T5800 packs 2 cores / 2 threads, while the Core 2 Quad Q9300 offers 4 cores / 4 threads — the Core 2 Quad Q9300 has 2 more cores. Boost clocks reach 2 GHz on the Core 2 Duo T5800 versus 2.5 GHz on the Core 2 Quad Q9300 — a 22.2% clock advantage for the Core 2 Quad Q9300 (base: 2 GHz vs 2.5 GHz). The Core 2 Duo T5800 uses the Merom (2006−2008) architecture (65 nm), while the Core 2 Quad Q9300 uses Yorkfield (2007−2009) (45 nm). In PassMark, the Core 2 Duo T5800 scores 2,000 against the Core 2 Quad Q9300's 2,011 — a 0.5% lead for the Core 2 Quad Q9300. L3 cache: 2 MB L2 Cache on the Core 2 Duo T5800 vs 0 kB on the Core 2 Quad Q9300.

Feature	Core 2 Duo T5800	Core 2 Quad Q9300
Cores / Threads	2 / 2	4 / 4+100%
Boost Clock	2 GHz	2.5 GHz+25%
Base Clock	2 GHz	2.5 GHz+25%
L3 Cache	2 MB L2 Cache	0 kB
L2 Cache	2 MB	6 MB (total)+200%
Process	65 nm	45 nm-31%
Architecture	Merom (2006−2008)	Yorkfield (2007−2009)
PassMark	2,000	2,011

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Memory & Platform

The Core 2 Duo T5800 uses the PGA478 socket (PCIe 1.1), while the Core 2 Quad Q9300 uses LGA775 (PCIe 1.1) — making them incompatible on the same motherboard.