Ryzen 9 5900X vs U300

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.

Head-to-Head Verdict, Benchmarks, Value & Long-Term Outlook

This comparison brings together gaming FPS, productivity performance, platform differences, power efficiency, pricing context, and upgrade path so you can see which CPU actually makes more sense.

Ryzen 9 5900X

2020

Why buy it

✅Better for gaming: +125.8% higher average FPS across 6 shared CPU benchmark tests.
✅+700% larger total L3 cache (64 MB vs 8 MB).
✅100+% more PCIe lanes (24 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌Launch MSRP is still $549 MSRP, while U300 mostly shows up through inconsistent older-market listings.
❌90.9% higher power demand at 105W vs 55W.
❌Older platform position on AM4 with DDR4, while U300 moves to FCBGA1744 and DDR5.

U300

2023

Why buy it

✅Draws 55W instead of 105W, a 50W reduction.
✅Newer platform on FCBGA1744 with DDR5 support instead of AM4 and DDR4.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 9 5900X across 6 shared CPU benchmark tests.
❌Lower PassMark (8,492 vs 38,955).
❌Smaller total L3 cache (8 MB vs 64 MB).

Ryzen 9 5900X

2020

U300

2023

Why buy it

✅Better for gaming: +125.8% higher average FPS across 6 shared CPU benchmark tests.
✅+700% larger total L3 cache (64 MB vs 8 MB).
✅100+% more PCIe lanes (24 vs 0) for storage and expansion-heavy builds.

Why buy it

✅Draws 55W instead of 105W, a 50W reduction.
✅Newer platform on FCBGA1744 with DDR5 support instead of AM4 and DDR4.

Trade-offs

❌Launch MSRP is still $549 MSRP, while U300 mostly shows up through inconsistent older-market listings.
❌90.9% higher power demand at 105W vs 55W.
❌Older platform position on AM4 with DDR4, while U300 moves to FCBGA1744 and DDR5.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 9 5900X across 6 shared CPU benchmark tests.
❌Lower PassMark (8,492 vs 38,955).
❌Smaller total L3 cache (8 MB vs 64 MB).

Quick Answers

So, is Ryzen 9 5900X better than U300?

Yes. Ryzen 9 5900X is the better overall CPU here. You are getting a 125.8% average FPS lead across 6 shared CPU game tests in our data and 358.7% better PassMark, which makes it the stronger all-around choice.

Which one is better for gaming?

If gaming is the priority, Ryzen 9 5900X is the better pick here. According to our tests, it delivers 125.8% more average FPS across 6 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 better fit. You are getting 358.7% better PassMark, backed by 12 cores and 24 threads. It also carries the larger cache pool with 700% larger total L3 cache (64 MB vs 8 MB).

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

Ryzen 9 5900X is the smarter buy today. Ryzen 9 5900X is at an unclear MSRP at $549 MSRP versus unclear MSRP, and it gives you a 125.8% average FPS lead across 6 shared CPU game tests in our data. It is also 100.0% better value on MSRP (71.0 vs 0.0 PassMark/$), so the better CPU is not just faster, it is also the cleaner value play on paper.

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

U300 is the more future-proof choice for 2026 and beyond. You are getting a newer CPU generation (2023 vs 2020) and a healthier platform with FCBGA1744 and DDR5 instead of AM4. That should give you a better long-term upgrade path for motherboard, RAM, and future CPU swaps.

Games Benchmarks

Paired with RTX 4090

To accurately isolate CPU performance, all benchmarks below use an NVIDIA RTX 4090 as the reference GPU. This eliminates GPU-side bottlenecks and highlights pure processing throughput differences between the CPUs.

Note: Real-world results may vary based on your actual GPU. CPU performance impact is more visible in processing-intensive titles and high-refresh-rate gaming scenarios.

Ryzen 9 5900X Benchmark Check

U300 Benchmark Check

Path of Exile 2

Preset	Ryzen 9 5900X	U300
1080p
low	323 FPS	182 FPS
medium	291 FPS	145 FPS
high	243 FPS	115 FPS
ultra	193 FPS	94 FPS
1440p
low	307 FPS	150 FPS
medium	248 FPS	118 FPS
high	192 FPS	94 FPS
ultra	157 FPS	77 FPS
4K
low	193 FPS	84 FPS
medium	156 FPS	72 FPS
high	115 FPS	57 FPS
ultra	103 FPS	44 FPS

Open Ryzen 9 5900X Open U300

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	Ryzen 9 5900X	U300
1080p
low	772 FPS	212 FPS
medium	647 FPS	212 FPS
high	508 FPS	212 FPS
ultra	450 FPS	200 FPS
1440p
low	619 FPS	212 FPS
medium	536 FPS	212 FPS
high	443 FPS	209 FPS
ultra	364 FPS	177 FPS
4K
low	365 FPS	212 FPS
medium	318 FPS	183 FPS
high	289 FPS	153 FPS
ultra	255 FPS	128 FPS

Open Ryzen 9 5900X Open U300

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	Ryzen 9 5900X	U300
1080p
low	832 FPS	212 FPS
medium	645 FPS	212 FPS
high	558 FPS	212 FPS
ultra	459 FPS	212 FPS
1440p
low	721 FPS	212 FPS
medium	565 FPS	212 FPS
high	488 FPS	212 FPS
ultra	407 FPS	212 FPS
4K
low	511 FPS	212 FPS
medium	421 FPS	212 FPS
high	374 FPS	212 FPS
ultra	308 FPS	168 FPS

Open Ryzen 9 5900X Open U300

League of Legends

League of Legends

Valorant

Preset	Ryzen 9 5900X	U300
1080p
low	974 FPS	212 FPS
medium	974 FPS	212 FPS
high	934 FPS	212 FPS
ultra	826 FPS	212 FPS
1440p
low	959 FPS	212 FPS
medium	843 FPS	212 FPS
high	726 FPS	212 FPS
ultra	617 FPS	212 FPS
4K
low	694 FPS	212 FPS
medium	621 FPS	212 FPS
high	541 FPS	212 FPS
ultra	437 FPS	212 FPS

Open Ryzen 9 5900X Open U300

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of Ryzen 9 5900X and U300

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.

U300

The U300 is manufactured by Intel. It was released in 1 January 2023 (2 years ago). It features 5 cores and 6 threads. Max frequency: 4.4 GHz. L3 cache: 8 MB Intel® Smart Cache. Built on Intel 7 nm process technology. Socket: FCBGA1744. Thermal design power (TDP): 55 Watt. Memory support: DDR5-5200, DDR4-3200, LPDDR4x-4267. Passmark benchmark score: 8,492 points. Launch price was $149.

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Processing Power

The Ryzen 9 5900X packs 12 cores / 24 threads, while the U300 offers 5 cores / 6 threads — the Ryzen 9 5900X has 7 more cores. Boost clocks reach 4.8 GHz on the Ryzen 9 5900X versus 4.4 GHz on the U300 — a 8.7% clock advantage for the Ryzen 9 5900X. The Ryzen 9 5900X is built on the Vermeer (Zen3) (2020−2022) architecture. In PassMark, the Ryzen 9 5900X scores 38,955 against the U300's 8,492 — a 128.4% lead for the Ryzen 9 5900X. L3 cache: 64 MB on the Ryzen 9 5900X vs 8 MB Intel® Smart Cache on the U300.

Feature	Ryzen 9 5900X	U300
Cores / Threads	12 / 24+140%	5 / 6
Boost Clock	4.8 GHz+9%	4.4 GHz
Base Clock	3.7 GHz	—
L3 Cache	64 MB+700%	8 MB Intel® Smart Cache
L2 Cache	512K (per core)	—
Process	7 nm, 12 nm	Intel 7 nm
Architecture	Vermeer (Zen3) (2020−2022)	—
PassMark	38,955+359%	8,492
Cinebench R23 Multi	21,000	—
Geekbench 6 Single	2,174	—
Geekbench 6 Multi	11,888	—

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Memory & Platform

The Ryzen 9 5900X uses the AM4 socket (PCIe 4.0), while the U300 uses FCBGA1744 (PCIe 4.0) — making them incompatible on the same motherboard.

Feature	Ryzen 9 5900X	U300
Socket	AM4	FCBGA1744
PCIe Generation	PCIe 4.0	PCIe 4.0
Max RAM Speed	DDR4-3200	—
Max RAM Capacity	128 GB	—
RAM Channels	2	—
ECC Support	Yes	—
PCIe Lanes	24	—

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Advanced Features

Virtualization: AMD-V (Ryzen 9 5900X) / not specified (U300). Primary use case: Ryzen 9 5900X targets Workstation. Direct competitor: Ryzen 9 5900X rivals Core i9-12900K.