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.

Phenom II X6 1100T BE

2010

Why buy it

✅Costs $284 less on MSRP ($265 MSRP vs $549 MSRP).
✅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 (5,745 vs 38,955).
❌Smaller total L3 cache (6 MB vs 64 MB).
❌Lower PassMark per dollar, at 21.7 vs 71.0 PassMark/$ ($265 MSRP vs $549 MSRP).
❌19% higher power demand at 125W vs 105W.

Ryzen 9 5900X

2020

Why buy it

✅Better for gaming: +199.2% higher average FPS across 50 shared CPU benchmark tests.
✅+966.7% larger total L3 cache (64 MB vs 6 MB).
✅Delivers 227.3% more PassMark for each dollar spent, at 71.0 vs 21.7 PassMark/$ ($549 MSRP vs $265 MSRP).
✅Draws 105W instead of 125W, a 20W reduction.
✅50% more PCIe lanes (24 vs 16) for storage and expansion-heavy builds.

Trade-offs

❌
107.2% HIGHER MSRP
$549 MSRPvs$265 MSRP
❌No boxed cooler included, unlike Phenom II X6 1100T BE.

Phenom II X6 1100T BE

2010

Ryzen 9 5900X

2020

Why buy it

✅Costs $284 less on MSRP ($265 MSRP vs $549 MSRP).
✅Includes a boxed cooler (Yes), unlike Ryzen 9 5900X.

Why buy it

✅Better for gaming: +199.2% higher average FPS across 50 shared CPU benchmark tests.
✅+966.7% larger total L3 cache (64 MB vs 6 MB).
✅Delivers 227.3% more PassMark for each dollar spent, at 71.0 vs 21.7 PassMark/$ ($549 MSRP vs $265 MSRP).
✅Draws 105W instead of 125W, a 20W reduction.
✅50% more PCIe lanes (24 vs 16) for storage and expansion-heavy builds.

Trade-offs

❌Worse for gaming: lower average FPS than Ryzen 9 5900X across 50 shared CPU benchmark tests.
❌Lower PassMark (5,745 vs 38,955).
❌Smaller total L3 cache (6 MB vs 64 MB).
❌Lower PassMark per dollar, at 21.7 vs 71.0 PassMark/$ ($265 MSRP vs $549 MSRP).
❌19% higher power demand at 125W vs 105W.

Trade-offs

❌
107.2% HIGHER MSRP
$549 MSRPvs$265 MSRP
❌No boxed cooler included, unlike Phenom II X6 1100T BE.

Quick Answers

So, is Ryzen 9 5900X better than Phenom II X6 1100T BE?

Yes. Ryzen 9 5900X is the better overall CPU here. You are getting a 199.2% average FPS lead across 50 shared CPU game tests in our data, 578.1% better PassMark, and the stronger long-term platform, 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 199.2% 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 better fit. You are getting 578.1% better PassMark, backed by 12 cores and 24 threads. It also carries the larger cache pool with 966.7% larger total L3 cache (64 MB vs 6 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 107.2% more expensive on MSRP at $549 MSRP versus $265 MSRP, and it gives you a 199.2% average FPS lead across 50 shared CPU game tests in our data. It is also 227.3% better value on MSRP (71.0 vs 21.7 PassMark/$), 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?

Ryzen 9 5900X is the more future-proof choice for 2026 and beyond. You are getting a newer CPU generation (2020 vs 2010), 966.7% larger total L3 cache (64 MB vs 6 MB), and more multi-core headroom with 12 cores / 24 threads instead of 6/6. That extra compute headroom should age better as games, background tasks, and creator workloads get heavier.

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.

Phenom II X6 1100T BE Benchmark Check

Ryzen 9 5900X Benchmark Check

Path of Exile 2

Preset	Phenom II X6 1100T BE	Ryzen 9 5900X
1080p
low	144 FPS	323 FPS
medium	140 FPS	291 FPS
high	113 FPS	243 FPS
ultra	93 FPS	193 FPS
1440p
low	137 FPS	307 FPS
medium	116 FPS	248 FPS
high	92 FPS	192 FPS
ultra	75 FPS	157 FPS
4K
low	63 FPS	193 FPS
medium	56 FPS	156 FPS
high	44 FPS	115 FPS
ultra	35 FPS	103 FPS

Open Phenom II X6 1100T BE Open Ryzen 9 5900X

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	Phenom II X6 1100T BE	Ryzen 9 5900X
1080p
low	144 FPS	772 FPS
medium	144 FPS	647 FPS
high	144 FPS	508 FPS
ultra	139 FPS	450 FPS
1440p
low	144 FPS	619 FPS
medium	144 FPS	536 FPS
high	144 FPS	443 FPS
ultra	125 FPS	364 FPS
4K
low	144 FPS	365 FPS
medium	137 FPS	318 FPS
high	122 FPS	289 FPS
ultra	93 FPS	255 FPS

Open Phenom II X6 1100T BE Open Ryzen 9 5900X

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	Phenom II X6 1100T BE	Ryzen 9 5900X
1080p
low	144 FPS	832 FPS
medium	144 FPS	645 FPS
high	144 FPS	558 FPS
ultra	144 FPS	459 FPS
1440p
low	144 FPS	721 FPS
medium	144 FPS	565 FPS
high	144 FPS	488 FPS
ultra	144 FPS	407 FPS
4K
low	144 FPS	511 FPS
medium	144 FPS	421 FPS
high	144 FPS	374 FPS
ultra	134 FPS	308 FPS

Open Phenom II X6 1100T BE Open Ryzen 9 5900X

League of Legends

League of Legends

Valorant

Preset	Phenom II X6 1100T BE	Ryzen 9 5900X
1080p
low	144 FPS	974 FPS
medium	144 FPS	974 FPS
high	144 FPS	934 FPS
ultra	144 FPS	826 FPS
1440p
low	144 FPS	959 FPS
medium	144 FPS	843 FPS
high	144 FPS	726 FPS
ultra	144 FPS	617 FPS
4K
low	144 FPS	694 FPS
medium	144 FPS	621 FPS
high	144 FPS	541 FPS
ultra	144 FPS	437 FPS

Open Phenom II X6 1100T BE Open Ryzen 9 5900X

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of Phenom II X6 1100T BE and Ryzen 9 5900X

Phenom II X6 1100T BE

The Phenom II X6 1100T BE is manufactured by AMD. It was released in 2009-01-01. It is based on the Thuban (2010) architecture. It features 6 cores and 6 threads. Base frequency is 3.3 GHz, with boost up to 3.7 GHz. L3 cache: 6 MB (total). L2 cache: 512 kB (per core). Built on 45 nm process technology. Socket: AM3. Thermal design power (TDP): 125 Watt. Memory support: DDR3. Passmark benchmark score: 5,745 points. Launch price was $149.

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.

⚡

Processing Power

The Phenom II X6 1100T BE packs 6 cores / 6 threads, while the Ryzen 9 5900X offers 12 cores / 24 threads — the Ryzen 9 5900X has 6 more cores. Boost clocks reach 3.7 GHz on the Phenom II X6 1100T BE versus 4.8 GHz on the Ryzen 9 5900X — a 25.9% clock advantage for the Ryzen 9 5900X (base: 3.3 GHz vs 3.7 GHz). The Phenom II X6 1100T BE uses the Thuban (2010) architecture (45 nm), while the Ryzen 9 5900X uses Vermeer (Zen3) (2020−2022) (7 nm, 12 nm). In PassMark, the Phenom II X6 1100T BE scores 5,745 against the Ryzen 9 5900X's 38,955 — a 148.6% lead for the Ryzen 9 5900X. Geekbench 6 single-core — the metric most relevant to gaming — records 508 vs 2,174, a 124.2% lead for the Ryzen 9 5900X that directly translates to higher frame rates. L3 cache: 6 MB (total) on the Phenom II X6 1100T BE vs 64 MB on the Ryzen 9 5900X.

Feature	Phenom II X6 1100T BE	Ryzen 9 5900X
Cores / Threads	6 / 6	12 / 24+100%
Boost Clock	3.7 GHz	4.8 GHz+30%
Base Clock	3.3 GHz	3.7 GHz+12%
L3 Cache	6 MB (total)	64 MB+967%
L2 Cache	512 kB (per core)	512K (per core)
Process	45 nm	7 nm, 12 nm-84%
Architecture	Thuban (2010)	Vermeer (Zen3) (2020−2022)
PassMark	5,745	38,955+578%
Cinebench R23 Multi	—	21,000
Geekbench 6 Single	508	2,174+328%
Geekbench 6 Multi	—	11,888

🧠

Memory & Platform

The Phenom II X6 1100T BE uses the AM3 socket (PCIe 2.0), while the Ryzen 9 5900X uses AM4 (PCIe 4.0) — making them incompatible on the same motherboard. Maximum memory speed reaches DDR3-1333 / DDR2-1066 on the Phenom II X6 1100T BE versus DDR4-3200 on the Ryzen 9 5900X — the Ryzen 9 5900X supports 28.6% 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 32 GB — 120% more capacity for professional workloads. Both feature 2-channel memory with ECC support. PCIe lanes: 16 (Phenom II X6 1100T BE) vs 24 (Ryzen 9 5900X) — the Ryzen 9 5900X offers 8 more lanes for additional GPUs or NVMe drives. Chipset compatibility: AMD 870,880G,890FX,970,990FX (Phenom II X6 1100T BE) and A320,B350,X370,B450,X470,B550,X570 (Ryzen 9 5900X).

Feature	Phenom II X6 1100T BE	Ryzen 9 5900X
Socket	AM3	AM4
PCIe Generation	PCIe 2.0	PCIe 4.0+100%
Max RAM Speed	DDR3-1333 / DDR2-1066	DDR4-3200+33%
Max RAM Capacity	32 GB	128 GB+300%
RAM Channels	2	2
ECC Support	Yes	Yes
PCIe Lanes	16	24+50%

🔧

Advanced Features

Both processors feature an unlocked multiplier for overclocking. Both support AMD-V virtualization. Primary use case: Phenom II X6 1100T BE targets Enthusiast Legacy, Ryzen 9 5900X targets Workstation. Direct competitor: Ryzen 9 5900X rivals Core i9-12900K.

Feature	Phenom II X6 1100T BE	Ryzen 9 5900X
Integrated GPU	No	No
Unlocked	Yes	Yes
AVX-512	No	No
Virtualization	AMD-V	AMD-V
Target Use	Enthusiast Legacy	Workstation

💰

Value Analysis

The Phenom II X6 1100T BE launched at $265 MSRP, while the Ryzen 9 5900X debuted at $549. On MSRP ($265 vs $549), the Phenom II X6 1100T BE is $284 cheaper. In terms of value on MSRP (PassMark points per dollar), the Phenom II X6 1100T BE delivers 21.7 pts/$ vs 71.0 pts/$ for the Ryzen 9 5900X — making the Ryzen 9 5900X the 106.4% better value option.