Core i3-2100 vs Phenom II X3 B77

Core i3-2100 vs Phenom II X3 B77 Performance Spectrum

Core i3-2100

2 / 4

1,856

+0.7%

1,844

0.0%

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

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 i3-2100 vs Phenom II X3 B77 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 i3-2100 vs Phenom II X3 B77: Pros, Cons & Final Verdict

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

Core i3-2100

2011

Why buy it

✅+0.7% higher PassMark.
✅Costs $164 less on MSRP ($117 MSRP vs $281 MSRP).
✅Delivers 141.7% more PassMark for each dollar spent, at 15.9 vs 6.6 PassMark/$ ($117 MSRP vs $281 MSRP).
✅Draws 65W instead of 95W, a 30W reduction.

Trade-offs

❌Smaller total L3 cache (3 MB vs 6 MB).

Phenom II X3 B77

2010

Why buy it

✅+100% larger total L3 cache (6 MB vs 3 MB).

Trade-offs

❌Lower PassMark (1,844 vs 1,856).
❌Lower PassMark per dollar, at 6.6 vs 15.9 PassMark/$ ($281 MSRP vs $117 MSRP).
❌46.2% higher power demand at 95W vs 65W.

Quick Answers

So, is Core i3-2100 better than Phenom II X3 B77?

It depends on what you want from the system. For gaming, Phenom II X3 B77 is ahead with a 0.9% average FPS lead across 50 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Core i3-2100 pulls ahead with 0.7% better PassMark. Phenom II X3 B77 also has the bigger cache pool with 100% larger total L3 cache (6 MB vs 3 MB).

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

For streaming, content creation, and heavier multitasking, Core i3-2100 is the stronger fit. You are getting 0.7% better PassMark, backed by 2 cores and 4 threads.

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

Core i3-2100 is the better buy right now. Core i3-2100 comes in $164 cheaper on MSRP at $117 MSRP versus $281 MSRP, and it still gives you 0.7% better PassMark. The compromise is that Phenom II X3 B77 is still the better pure gaming CPU with a 0.9% average FPS lead across 50 shared CPU game tests in our data. It is also 141.7% better value on MSRP (15.9 vs 6.6 PassMark/$), 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 i3-2100 makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2011 vs 2010) and more multi-core headroom with 2 cores / 4 threads instead of 3/3. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Core i3-2100 vs Phenom II X3 B77 Technical Specifications

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

Core i3-2100

The Core i3-2100 is manufactured by Intel. It was released in 20 February 2011 (14 years ago). It is based on the Sandy Bridge (2011−2013) architecture. It features 2 cores and 4 threads. Base frequency is 3.1 GHz, with boost up to 3.1 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: 1,856 points. Launch price was $73.

Phenom II X3 B77

The Phenom II X3 B77 is manufactured by AMD. It was released in 2009-01-01. It is based on the Heka (2009−2010) architecture. It features 3 cores and 3 threads. Base frequency is 3.2 GHz, with boost up to 3.2 GHz. L3 cache: 6 MB (total). L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: AM3. Thermal design power (TDP): 95 Watt. Memory support: DDR3. Passmark benchmark score: 1,844 points. Launch price was $149.

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Processing Power

The Core i3-2100 packs 2 cores / 4 threads, while the Phenom II X3 B77 offers 3 cores / 3 threads — the Phenom II X3 B77 has 1 more core. Boost clocks reach 3.1 GHz on the Core i3-2100 versus 3.2 GHz on the Phenom II X3 B77 — a 3.2% clock advantage for the Phenom II X3 B77 (base: 3.1 GHz vs 3.2 GHz). The Core i3-2100 uses the Sandy Bridge (2011−2013) architecture (32 nm), while the Phenom II X3 B77 uses Heka (2009−2010) (45 nm). In PassMark, the Core i3-2100 scores 1,856 against the Phenom II X3 B77's 1,844 — a 0.6% lead for the Core i3-2100. L3 cache: 3 MB (total) on the Core i3-2100 vs 6 MB (total) on the Phenom II X3 B77.

Feature	Core i3-2100	Phenom II X3 B77
Cores / Threads	2 / 4	3 / 3+50%
Boost Clock	3.1 GHz	3.2 GHz+3%
Base Clock	3.1 GHz	3.2 GHz+3%
L3 Cache	3 MB (total)	6 MB (total)+100%
L2 Cache	256 kB (per core)	512 kB (per core)+100%
Process	32 nm-29%	45 nm
Architecture	Sandy Bridge (2011−2013)	Heka (2009−2010)
PassMark	1,856	1,844

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Memory & Platform

The Core i3-2100 uses the LGA1155 socket (PCIe 2.0), while the Phenom II X3 B77 uses AM3 (PCIe 2.0) — making them incompatible on the same motherboard.

Feature	Core i3-2100	Phenom II X3 B77
Socket	LGA1155	AM3
PCIe Generation	PCIe 2.0	PCIe 2.0
Max RAM Speed	—	DDR3-1333
Max RAM Capacity	—	32 GB
RAM Channels	—	2
ECC Support	—	Yes
PCIe Lanes	—	0

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Value Analysis

At launch, the Core i3-2100 was priced at $117, while the Phenom II X3 B77 came in at $281. On launch pricing ($117 vs $281), Core i3-2100 was $164 cheaper. In terms of value on MSRP (PassMark points per dollar), the Core i3-2100 delivers 15.9 pts/$ vs 6.6 pts/$ for the Phenom II X3 B77 — making the Core i3-2100 the 82.9% better value option.

Feature	Core i3-2100	Phenom II X3 B77
MSRP	$117-58%	$281
Performance per Dollar	15.9+141%	6.6
Release Date	2011	2010

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