Celeron 3965Y vs Core 2 Duo T9900

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 3965Y vs Core 2 Duo T9900 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 3965Y vs Core 2 Duo T9900: Pros, Cons & Final Verdict

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

Celeron 3965Y

2017

Why buy it

✅Draws 6W instead of 35W, a 29W reduction.
✅100+% more PCIe lanes (10 vs 0) for storage and expansion-heavy builds.
✅Integrated graphics onboard with Intel HD Graphics 615, while Core 2 Duo T9900 needs a discrete GPU.

Trade-offs

❌Lower PassMark (1,201 vs 1,204).
❌Smaller total L3 cache (2 MB vs 6 MB).

Core 2 Duo T9900

2009

Why buy it

✅+0.2% higher PassMark.
✅+200% larger total L3 cache (6 MB vs 2 MB).

Trade-offs

❌483.3% higher power demand at 35W vs 6W.
❌No integrated graphics, while Celeron 3965Y can still boot and troubleshoot without a discrete GPU.

Quick Answers

So, is Celeron 3965Y better than Core 2 Duo T9900?

It depends on what you want from the system. For gaming, Celeron 3965Y is ahead with a 0.1% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Core 2 Duo T9900 pulls ahead with 0.2% better PassMark. Core 2 Duo T9900 also has the bigger cache pool with 200% larger total L3 cache (6 MB vs 2 MB).

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

For streaming, content creation, and heavier multitasking, Core 2 Duo T9900 is the stronger fit. You are getting 0.2% better PassMark, backed by 2 cores and 2 threads. It also has the larger cache pool with 200% larger total L3 cache (6 MB vs 2 MB).

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

Celeron 3965Y still makes the most sense overall. Celeron 3965Y comes in at an unclear MSRP at unclear MSRP versus unclear MSRP, and it still gives you a 0.1% average FPS lead across 50 shared CPU game tests in our data.

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

Celeron 3965Y makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2017 vs 2009). That makes it the safer long-term bet.

Celeron 3965Y vs Core 2 Duo T9900 Technical Specifications

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

Celeron 3965Y

The Celeron 3965Y is manufactured by Intel. It was released in 2007-01-01. It is based on the Kaby Lake (2016−2019) architecture. It features 2 cores and 2 threads. Base frequency is 1.5 GHz, with boost up to 1.3 GHz. L3 cache: 2 MB. L2 cache: 512 kB. Built on 14 nm process technology. Socket: FCBGA1515. Thermal design power (TDP): 6 Watt. Memory support: DDR3. Passmark benchmark score: 1,201 points. Launch price was $69.

Core 2 Duo T9900

The Core 2 Duo T9900 is manufactured by Intel. It was released in 2 June 2009 (16 years ago). It is based on the Penryn (2008−2011) architecture. It features 2 cores and 2 threads. Base frequency is 3.06 GHz, with boost up to 0.07 GHz. L3 cache: 6 MB L2 Cache. L2 cache: 6 MB (total). Built on 45 nm process technology. Socket: PGA478. Thermal design power (TDP): 35 Watt. Memory support: DDR2, DDR3. Passmark benchmark score: 1,204 points. Launch price was $530.

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Processing Power

Both the Celeron 3965Y and Core 2 Duo T9900 share an identical 2-core/2-thread configuration. Boost clocks reach 1.3 GHz on the Celeron 3965Y versus 0.07 GHz on the Core 2 Duo T9900 — a 179.6% clock advantage for the Celeron 3965Y (base: 1.5 GHz vs 3.06 GHz). The Celeron 3965Y uses the Kaby Lake (2016−2019) architecture (14 nm), while the Core 2 Duo T9900 uses Penryn (2008−2011) (45 nm). In PassMark, the Celeron 3965Y scores 1,201 against the Core 2 Duo T9900's 1,204 — a 0.2% lead for the Core 2 Duo T9900. L3 cache: 2 MB on the Celeron 3965Y vs 6 MB L2 Cache on the Core 2 Duo T9900.

Feature	Celeron 3965Y	Core 2 Duo T9900
Cores / Threads	2 / 2	2 / 2
Boost Clock	1.3 GHz+1757%	0.07 GHz
Base Clock	1.5 GHz	3.06 GHz+104%
L3 Cache	2 MB	6 MB L2 Cache+200%
L2 Cache	512 kB	6 MB (total)+1100%
Process	14 nm-69%	45 nm
Architecture	Kaby Lake (2016−2019)	Penryn (2008−2011)
PassMark	1,201	1,204
Geekbench 6 Single	372	—
Geekbench 6 Multi	708	—

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Memory & Platform

The Celeron 3965Y uses the FCBGA1515 socket (PCIe 3.0), while the Core 2 Duo T9900 uses PGA478 (PCIe 1.1) — making them incompatible on the same motherboard.

Feature	Celeron 3965Y	Core 2 Duo T9900
Socket	FCBGA1515	PGA478
PCIe Generation	PCIe 3.0+173%	PCIe 1.1
Max RAM Speed	LPDDR3-1866	—
Max RAM Capacity	16 GB	—
RAM Channels	2	—
ECC Support	No	—
PCIe Lanes	10	—

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Advanced Features

Virtualization: VT-x, VT-d (Celeron 3965Y) / not specified (Core 2 Duo T9900). The Celeron 3965Y includes integrated graphics (Intel HD Graphics 615), while the Core 2 Duo T9900 requires a dedicated GPU. Primary use case: Celeron 3965Y targets Low Power. Direct competitor: Celeron 3965Y rivals Pentium Gold 4415Y.