Phenom X4 9750B vs Ryzen 7 5800X

CPU

GPU

Phenom X4 9750B

4 Cores4 Thrd95 WWMax: 2.4 GHz2008

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Ryzen 7 5800X

8 Cores16 Thrd105 WWMax: 4.7 GHz2020

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Phenom X4 9750B vs Ryzen 7 5800X Performance Spectrum

Phenom X4 9750B

4 / 4

1,520

0.0%

Ryzen Threadripper PRO 5945WX

Ryzen Threadripper PRO 7955WX

Ryzen Threadripper 3990X

Ryzen 7 5800X

8 / 16

27,712

+1723.2%

Ryzen Threadripper 3990X

Ryzen Threadripper PRO 9965WX

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.

Phenom X4 9750B vs Ryzen 7 5800X 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.

Phenom X4 9750B vs Ryzen 7 5800X: Pros, Cons & Final Verdict

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

Phenom X4 9750B

2008

Why buy it

✅Costs $234 less on MSRP ($215 MSRP vs $449 MSRP).

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 7 5800X across 50 shared CPU benchmark tests.
❌Lower PassMark (1,520 vs 27,712).
❌Smaller total L3 cache (2 MB vs 32 MB).
❌Lower PassMark per dollar, at 7.1 vs 61.7 PassMark/$ ($215 MSRP vs $449 MSRP).

Ryzen 7 5800X

2020

Why buy it

✅Better for gaming: +553.5% higher average FPS across 50 shared CPU benchmark tests.
✅+1500% larger total L3 cache (32 MB vs 2 MB).
✅Delivers 773.0% more PassMark for each dollar spent, at 61.7 vs 7.1 PassMark/$ ($449 MSRP vs $215 MSRP).
✅50% more PCIe lanes (24 vs 16) for storage and expansion-heavy builds.

Trade-offs

❌
108.8% HIGHER MSRP
$449 MSRPvs$215 MSRP

Quick Answers

So, is Ryzen 7 5800X better than Phenom X4 9750B?

Yes. Ryzen 7 5800X is the better all-around CPU here. It gives you a 553.5% average FPS lead across 50 shared CPU game tests in our data, 1723.2% 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 7 5800X is the better pick. According to our tests, it delivers 553.5% 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 7 5800X is the stronger fit. You are getting 1723.2% better PassMark, backed by 8 cores and 16 threads. It also has the larger cache pool with 1500% larger total L3 cache (32 MB vs 2 MB).

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

Ryzen 7 5800X is the better buy right now. Ryzen 7 5800X comes in 108.8% more expensive on MSRP at $449 MSRP versus $215 MSRP, and it still gives you a 553.5% average FPS lead across 50 shared CPU game tests in our data. It is also 773.0% better value on MSRP (61.7 vs 7.1 PassMark/$), 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 7 5800X makes more sense long term for 2026 and beyond. You are getting a newer CPU generation (2020 vs 2008), 1500% larger total L3 cache (32 MB vs 2 MB), and more multi-core headroom with 8 cores / 16 threads instead of 4/4. That extra compute headroom is more likely to matter as games, background tasks, and creator workloads get heavier.

Phenom X4 9750B vs Ryzen 7 5800X Technical Specifications

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

Phenom X4 9750B

The Phenom X4 9750B is manufactured by AMD. It was released in 2009-01-01. It is based on the Agena (2007−2008) architecture. It features 4 cores and 4 threads. Max frequency: 2.4 GHz. L3 cache: 2 MB (total). L2 cache: 512 kB (per core). Built on 65 nm process technology. Socket: AM2+. Thermal design power (TDP): 95 Watt. Passmark benchmark score: 1,520 points. Launch price was $149.

Ryzen 7 5800X

The Ryzen 7 5800X is manufactured by AMD. It was released in 5 November 2020 (5 years ago). It is based on the Vermeer (Zen 3) (2020−2022) architecture. It features 8 cores and 16 threads. Base frequency is 3.8 GHz, with boost up to 4.7 GHz. L3 cache: 32 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. Passmark benchmark score: 27,712 points. Launch price was $449.

⚡

Processing Power

The Phenom X4 9750B packs 4 cores / 4 threads, while the Ryzen 7 5800X offers 8 cores / 16 threads — the Ryzen 7 5800X has 4 more cores. Boost clocks reach 2.4 GHz on the Phenom X4 9750B versus 4.7 GHz on the Ryzen 7 5800X — a 64.8% clock advantage for the Ryzen 7 5800X. The Phenom X4 9750B uses the Agena (2007−2008) architecture (65 nm), while the Ryzen 7 5800X uses Vermeer (Zen 3) (2020−2022) (7 nm, 12 nm). In PassMark, the Phenom X4 9750B scores 1,520 against the Ryzen 7 5800X's 27,712 — a 179.2% lead for the Ryzen 7 5800X. L3 cache: 2 MB (total) on the Phenom X4 9750B vs 32 MB on the Ryzen 7 5800X.

Feature	Phenom X4 9750B	Ryzen 7 5800X
Cores / Threads	4 / 4	8 / 16+100%
Boost Clock	2.4 GHz	4.7 GHz+96%
Base Clock	—	3.8 GHz
L3 Cache	2 MB (total)	32 MB+1500%
L2 Cache	512 kB (per core)	512K (per core)
Process	65 nm	7 nm, 12 nm-89%
Architecture	Agena (2007−2008)	Vermeer (Zen 3) (2020−2022)
PassMark	1,520	27,712+1723%
Geekbench 6 Single	300	—
Geekbench 6 Multi	1,000	—

🧠

Memory & Platform

The Phenom X4 9750B uses the AM2+ socket (PCIe 2.0), while the Ryzen 7 5800X uses AM4 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR2-1066 on the Phenom X4 9750B versus DDR4-3200 on the Ryzen 7 5800X — the Ryzen 7 5800X supports 200.2% faster memory, which can translate to measurable gains in memory-sensitive workloads. The Ryzen 7 5800X supports up to 128 GB of RAM compared to 8 GB — 1500% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Phenom X4 9750B) vs 24 (Ryzen 7 5800X) — the Ryzen 7 5800X offers 8 more lanes for additional GPUs or NVMe drives. Chipset compatibility: AM2+,AM2 (Phenom X4 9750B) and AMD 500 series,AMD 400 series,AMD 300 series (Ryzen 7 5800X).

Feature	Phenom X4 9750B	Ryzen 7 5800X
Socket	AM2+	AM4
PCIe Generation	PCIe 2.0	PCIe 4.0+100%
Max RAM Speed	DDR2-1066	DDR4-3200+200%
Max RAM Capacity	8 GB	128 GB+1500%
RAM Channels	2	2
ECC Support	No	Yes
PCIe Lanes	16	24+50%

🔧

Advanced Features

Only the Ryzen 7 5800X has an unlocked multiplier for overclocking — a significant advantage for enthusiasts seeking extra performance. Both support AMD-V virtualization. Primary use case: Phenom X4 9750B targets Legacy Desktop, Ryzen 7 5800X targets Desktop.

Feature	Phenom X4 9750B	Ryzen 7 5800X
Integrated GPU	No	No
IGPU Model	None	—
Unlocked	No	Yes
AVX-512	No	No
Virtualization	AMD-V	AMD-V
Target Use	Legacy Desktop	Desktop

💰

Value Analysis

At launch, the Phenom X4 9750B was priced at $215, while the Ryzen 7 5800X came in at $449. On launch pricing ($215 vs $449), Phenom X4 9750B was $234 cheaper. In terms of value on MSRP (PassMark points per dollar), the Phenom X4 9750B delivers 7.1 pts/$ vs 61.7 pts/$ for the Ryzen 7 5800X — making the Ryzen 7 5800X the 158.9% better value option.

Feature	Phenom X4 9750B	Ryzen 7 5800X
MSRP	$215-52%	$449
Performance per Dollar	7.1	61.7+769%
Release Date	2008	2020

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