Core i5-3450S vs Phenom II X3 P840

Core i5-3450S vs Phenom II X3 P840 Performance Spectrum

Core i5-3450S

4 / 4

4,399

0.0%

4,425

+0.6%

Ryzen Threadripper PRO 7965WX

About PassMark

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 i5-3450S vs Phenom II X3 P840 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 i5-3450S vs Phenom II X3 P840: Pros, Cons & Final Verdict

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

Core i5-3450S

2012

Why buy it

✅Better for gaming: +3.0% higher average FPS across 50 shared CPU benchmark tests.

Trade-offs

❌Lower PassMark (4,399 vs 4,425).
❌Launch MSRP is still $174 MSRP, while Phenom II X3 P840 mostly shows up through inconsistent older-market listings.
❌4233.3% higher power demand at 65W vs 1.5W.

Phenom II X3 P840

2010

Why buy it

✅+0.6% higher PassMark.
✅Draws 2W instead of 65W, a 64W reduction.

Trade-offs

❌Worse for gaming: lower average FPS than Core i5-3450S across 50 shared CPU benchmark tests.

Quick Answers

So, is Core i5-3450S better than Phenom II X3 P840?

It depends on what you want from the system. For gaming, Core i5-3450S is ahead with a 3.0% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Phenom II X3 P840 pulls ahead with 0.6% better PassMark.

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

For streaming, content creation, and heavier multitasking, Phenom II X3 P840 is the stronger fit. You are getting 0.6% better PassMark, backed by 3 cores and 3 threads.

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

Core i5-3450S is the better buy right now. Core i5-3450S comes in at an unclear MSRP at $174 MSRP versus unclear MSRP, and it still gives you a 3.0% average FPS lead across 50 shared CPU game tests in our data. The compromise is that Phenom II X3 P840 is still stronger for heavier multi-core work with 0.6% better PassMark. It is also 100.0% better value on MSRP (25.3 vs 0.0 PassMark/$), 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 i5-3450S makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2012 vs 2010). That makes it the safer long-term bet.

Core i5-3450S vs Phenom II X3 P840 Technical Specifications

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

Core i5-3450S

The Core i5-3450S is manufactured by Intel. It was released in 29 April 2012 (13 years ago). It is based on the Ivy Bridge (2012−2013) architecture. It features 4 cores and 4 threads. Base frequency is 2.8 GHz, with boost up to 3.5 GHz. L3 cache: 6144 kB (total). L2 cache: 256 kB (per core). Built on 22 nm process technology. Socket: LGA1155. Thermal design power (TDP): 65 Watt. Memory support: DDR3. Passmark benchmark score: 4,399 points. Launch price was $150.

Phenom II X3 P840

The Phenom II X3 P840 is manufactured by AMD. It was released in 2009-01-01. It is based on the Champlain (2010−2011) architecture. It features 3 cores and 3 threads. Max frequency: 1.9 GHz. L2 cache: 1.5 MB. Built on 45 nm process technology. Socket: S1. Thermal design power (TDP): 1.5 MB. Memory support: DDR3. Passmark benchmark score: 4,425 points. Launch price was $149.

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Processing Power

The Core i5-3450S packs 4 cores / 4 threads, while the Phenom II X3 P840 offers 3 cores / 3 threads — the Core i5-3450S has 1 more core. Boost clocks reach 3.5 GHz on the Core i5-3450S versus 1.9 GHz on the Phenom II X3 P840 — a 59.3% clock advantage for the Core i5-3450S. The Core i5-3450S uses the Ivy Bridge (2012−2013) architecture (22 nm), while the Phenom II X3 P840 uses Champlain (2010−2011) (45 nm). In PassMark, the Core i5-3450S scores 4,399 against the Phenom II X3 P840's 4,425 — a 0.6% lead for the Phenom II X3 P840.

Feature	Core i5-3450S	Phenom II X3 P840
Cores / Threads	4 / 4+33%	3 / 3
Boost Clock	3.5 GHz+84%	1.9 GHz
Base Clock	2.8 GHz	—
L3 Cache	6144 kB (total)	—
L2 Cache	256 kB (per core)	1.5 MB+500%
Process	22 nm-51%	45 nm
Architecture	Ivy Bridge (2012−2013)	Champlain (2010−2011)
PassMark	4,399	4,425

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Memory & Platform

The Core i5-3450S uses the LGA1155 socket (PCIe 3.0), while the Phenom II X3 P840 uses S1 (PCIe 2.0) — making them incompatible on the same motherboard.