Pentium III 1400S vs Ryzen 9 5900X

Pentium III 1400S vs Ryzen 9 5900X Performance Spectrum

Pentium III 1400S

1 / 1

228

0.0%

38,955

+16985.5%

Ryzen Threadripper 9960X

Ryzen Threadripper PRO 9975WX

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.

Pentium III 1400S vs Ryzen 9 5900X 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.

Pentium III 1400S vs Ryzen 9 5900X: Pros, Cons & Final Verdict

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

Pentium III 1400S

2002

Why buy it

✅Costs $299 less on MSRP ($250 MSRP vs $549 MSRP).
✅Draws 32W instead of 105W, a 73W reduction.
✅Includes a boxed cooler (Yes), unlike Ryzen 9 5900X.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 9 5900X across 50 shared CPU benchmark tests.
❌Lower PassMark (228 vs 38,955).
❌Lower PassMark per dollar, at 0.9 vs 71.0 PassMark/$ ($250 MSRP vs $549 MSRP).

Ryzen 9 5900X

2020

Why buy it

✅Better for gaming: +4473.0% higher average FPS across 50 shared CPU benchmark tests.
✅Delivers 7680.3% more PassMark for each dollar spent, at 71.0 vs 0.9 PassMark/$ ($549 MSRP vs $250 MSRP).
✅100+% more PCIe lanes (24 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌
119.6% HIGHER MSRP
$549 MSRPvs$250 MSRP
❌228.1% higher power demand at 105W vs 32W.
❌No boxed cooler included, unlike Pentium III 1400S.

Quick Answers

So, is Ryzen 9 5900X better than Pentium III 1400S?

Yes. Ryzen 9 5900X is the better all-around CPU here. It gives you a 4473.0% average FPS lead across 50 shared CPU game tests in our data, 16985.5% 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, Ryzen 9 5900X is the better pick. According to our tests, it delivers 4473.0% 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, Ryzen 9 5900X is the stronger fit. You are getting 16985.5% better PassMark, backed by 12 cores and 24 threads.

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

Ryzen 9 5900X is the better buy right now. Ryzen 9 5900X comes in 119.6% more expensive on MSRP at $549 MSRP versus $250 MSRP, and it still gives you a 4473.0% average FPS lead across 50 shared CPU game tests in our data. It is also 7680.3% better value on MSRP (71.0 vs 0.9 PassMark/$), so you are getting the faster CPU without taking a value hit on paper.

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

Ryzen 9 5900X makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2020 vs 2002) and more multi-core headroom with 12 cores / 24 threads instead of 1/1. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Pentium III 1400S vs Ryzen 9 5900X Technical Specifications

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

Pentium III 1400S

The Pentium III 1400S is manufactured by Intel. It was released in 2007-01-01. It is based on the Tualatin (2000−2002) architecture. It features 1 cores and 1 threads. Max frequency: 1.4 GHz. L3 cache: 0 kB. L2 cache: 512 kB. Built on 130 nm process technology. Socket: PGA370. Thermal design power (TDP): 32 Watt. Passmark benchmark score: 228 points. Launch price was $69.

Ryzen 9 5900X

The Ryzen 9 5900X is manufactured by AMD. It was released in 5 November 2020 (5 years ago). It is based on the Vermeer (Zen3) (2020−2022) architecture. It features 12 cores and 24 threads. Base frequency is 3.7 GHz, with boost up to 4.8 GHz. L3 cache: 64 MB. L2 cache: 512K (per core). Built on 7 nm, 12 nm process technology. Socket: AM4. Thermal design power (TDP): 105 Watt. Memory support: DDR4-3200. Passmark benchmark score: 38,955 points. Launch price was $549.

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Processing Power

The Pentium III 1400S packs 1 cores / 1 threads, while the Ryzen 9 5900X offers 12 cores / 24 threads — the Ryzen 9 5900X has 11 more cores. Boost clocks reach 1.4 GHz on the Pentium III 1400S versus 4.8 GHz on the Ryzen 9 5900X — a 109.7% clock advantage for the Ryzen 9 5900X. The Pentium III 1400S uses the Tualatin (2000−2002) architecture (130 nm), while the Ryzen 9 5900X uses Vermeer (Zen3) (2020−2022) (7 nm, 12 nm). In PassMark, the Pentium III 1400S scores 228 against the Ryzen 9 5900X's 38,955 — a 197.7% lead for the Ryzen 9 5900X. L3 cache: 0 kB on the Pentium III 1400S vs 64 MB on the Ryzen 9 5900X.

Feature	Pentium III 1400S	Ryzen 9 5900X
Cores / Threads	1 / 1	12 / 24+1100%
Boost Clock	1.4 GHz	4.8 GHz+243%
Base Clock	—	3.7 GHz
L3 Cache	0 kB	64 MB
L2 Cache	512 kB	512K (per core)
Process	130 nm	7 nm, 12 nm-95%
Architecture	Tualatin (2000−2002)	Vermeer (Zen3) (2020−2022)
PassMark	228	38,955+16986%
Cinebench R23 Multi	—	21,000
Geekbench 6 Single	—	2,174
Geekbench 6 Multi	—	11,888

🧠

Memory & Platform

The Pentium III 1400S uses the PGA370 socket (PCIe 1.1), while the Ryzen 9 5900X uses AM4 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches PC133 on the Pentium III 1400S versus DDR4-3200 on the Ryzen 9 5900X — the Ryzen 9 5900X supports 2306% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Ryzen 9 5900X supports up to 128 GB of RAM compared to 4 GB — 3100% more capacity for professional workloads. Memory channels: 1 (Pentium III 1400S) vs 2 (Ryzen 9 5900X). PCIe lanes: 0 (Pentium III 1400S) vs 24 (Ryzen 9 5900X) — the Ryzen 9 5900X offers 24 more lanes for additional GPUs or NVMe drives. Chipset compatibility: Intel 815,VIA Apollo Pro 133T (Pentium III 1400S) and A320,B350,X370,B450,X470,B550,X570 (Ryzen 9 5900X).

Feature	Pentium III 1400S	Ryzen 9 5900X
Socket	PGA370	AM4
PCIe Generation	PCIe 1.1	PCIe 4.0+264%
Max RAM Speed	PC133	DDR4-3200+2306%
Max RAM Capacity	4 GB	128 GB+3100%
RAM Channels	1	2+100%
ECC Support	Yes	Yes
PCIe Lanes	0	24

🔧

Advanced Features

Virtualization support: No (Pentium III 1400S) vs AMD-V (Ryzen 9 5900X). Primary use case: Ryzen 9 5900X targets Workstation. Direct competitor: Ryzen 9 5900X rivals Core i9-12900K.

Feature	Pentium III 1400S	Ryzen 9 5900X
Integrated GPU	No	No
Unlocked	—	Yes
AVX-512	No	No
Virtualization	No	AMD-V
Target Use	—	Workstation

💰

Value Analysis

At launch, the Pentium III 1400S was priced at $250, while the Ryzen 9 5900X came in at $549. On launch pricing ($250 vs $549), Pentium III 1400S was $299 cheaper. In terms of value on MSRP (PassMark points per dollar), the Pentium III 1400S delivers 0.9 pts/$ vs 71.0 pts/$ for the Ryzen 9 5900X — making the Ryzen 9 5900X the 194.9% better value option.

Feature	Pentium III 1400S	Ryzen 9 5900X
MSRP	$250-54%	$549
Performance per Dollar	0.9	71.0+7789%
Release Date	2002	2020

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