Atom C3958 vs FX-6120

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.

Atom C3958

2017

Why buy it

✅+2% higher PassMark.
✅+100% larger total L3 cache (16 MB vs 8 MB).
✅Draws 31W instead of 95W, a 64W reduction.
✅100+% more PCIe lanes (12 vs 0) for storage and expansion-heavy builds.

Trade-offs

❌Fewer obvious downsides in this matchup outside of normal market pricing swings.

FX-6120

2012

Why buy it

Trade-offs

❌Lower PassMark (3,853 vs 3,929).
❌Smaller total L3 cache (8 MB vs 16 MB).
❌Launch MSRP is still $188 MSRP, while Atom C3958 mostly shows up through inconsistent older-market listings.
❌206.5% higher power demand at 95W vs 31W.

Atom C3958

2017

FX-6120

2012

Why buy it

✅+2% higher PassMark.
✅+100% larger total L3 cache (16 MB vs 8 MB).
✅Draws 31W instead of 95W, a 64W reduction.
✅100+% more PCIe lanes (12 vs 0) for storage and expansion-heavy builds.

Why buy it

Trade-offs

❌Fewer obvious downsides in this matchup outside of normal market pricing swings.

Trade-offs

❌Lower PassMark (3,853 vs 3,929).
❌Smaller total L3 cache (8 MB vs 16 MB).
❌Launch MSRP is still $188 MSRP, while Atom C3958 mostly shows up through inconsistent older-market listings.
❌206.5% higher power demand at 95W vs 31W.

Quick Answers

So, is Atom C3958 better than FX-6120?

It depends on what matters more to you. For gaming, FX-6120 is ahead with a 2.9% average FPS lead across 4 shared CPU game tests in our data. For rendering, compiling, streaming, and heavier multitasking, Atom C3958 pulls ahead with 2% better PassMark. Atom C3958 also has the bigger cache pool with 100% larger total L3 cache (16 MB vs 8 MB).

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

For streaming, content creation, and heavier multitasking, Atom C3958 is the better fit. You are getting 2% better PassMark, backed by 16 cores and 16 threads. It also carries the larger cache pool with 100% larger total L3 cache (16 MB vs 8 MB).

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

Atom C3958 is the smarter buy by a wide margin for a fresh build. Atom C3958 is at an unclear MSRP at unclear MSRP versus $188 MSRP, and it gives you 2% better PassMark. FX-6120 only looks stronger on raw value math because it is extremely cheap, but that is mostly used-market pricing on an obsolete 2012 platform. Even with 100.0% better value on paper (20.5 vs 0.0 PassMark/$), it really only makes sense as a very cheap stopgap or a niche existing-platform option for someone already on AM3+.

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

Atom C3958 is the more future-proof choice for 2026 and beyond. You are getting a newer CPU generation (2017 vs 2012), 100% larger total L3 cache (16 MB vs 8 MB), and more multi-core headroom with 16 cores / 16 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.

Atom C3958 Benchmark Check

FX-6120 Benchmark Check

Path of Exile 2

Preset	Atom C3958	FX-6120
1080p
low	98 FPS	96 FPS
medium	98 FPS	96 FPS
high	98 FPS	96 FPS
ultra	87 FPS	96 FPS
1440p
low	98 FPS	96 FPS
medium	98 FPS	96 FPS
high	86 FPS	94 FPS
ultra	68 FPS	78 FPS
4K
low	65 FPS	65 FPS
medium	55 FPS	57 FPS
high	43 FPS	45 FPS
ultra	34 FPS	36 FPS

Open Atom C3958 Open FX-6120

Path of Exile 2

Path of Exile 2

Counter-Strike 2

Preset	Atom C3958	FX-6120
1080p
low	98 FPS	96 FPS
medium	98 FPS	96 FPS
high	98 FPS	96 FPS
ultra	90 FPS	96 FPS
1440p
low	98 FPS	96 FPS
medium	98 FPS	96 FPS
high	98 FPS	96 FPS
ultra	81 FPS	96 FPS
4K
low	91 FPS	96 FPS
medium	84 FPS	96 FPS
high	75 FPS	96 FPS
ultra	58 FPS	96 FPS

Open Atom C3958 Open FX-6120

Counter-Strike 2

Counter-Strike 2

League of Legends

Preset	Atom C3958	FX-6120
1080p
low	98 FPS	96 FPS
medium	98 FPS	96 FPS
high	98 FPS	96 FPS
ultra	98 FPS	96 FPS
1440p
low	98 FPS	96 FPS
medium	98 FPS	96 FPS
high	98 FPS	96 FPS
ultra	98 FPS	96 FPS
4K
low	98 FPS	96 FPS
medium	98 FPS	96 FPS
high	98 FPS	96 FPS
ultra	98 FPS	96 FPS

Open Atom C3958 Open FX-6120

League of Legends

League of Legends

Valorant

Preset	Atom C3958	FX-6120
1080p
low	98 FPS	96 FPS
medium	98 FPS	96 FPS
high	98 FPS	96 FPS
ultra	98 FPS	96 FPS
1440p
low	98 FPS	96 FPS
medium	98 FPS	96 FPS
high	98 FPS	96 FPS
ultra	98 FPS	96 FPS
4K
low	98 FPS	96 FPS
medium	98 FPS	96 FPS
high	98 FPS	96 FPS
ultra	98 FPS	96 FPS

Open Atom C3958 Open FX-6120

Valorant

Valorant

Check FPS for your specific build

Technical Specifications

Side-by-side comparison of Atom C3958 and FX-6120

Atom C3958

The Atom C3958 is manufactured by Intel. It was released in 15 August 2017 (8 years ago). It is based on the Goldmont (2016−2017) architecture. It features 16 cores and 16 threads. Base frequency is 2 GHz, with boost up to 2 GHz. L3 cache: 16 MB. L2 cache: 16 MB. Built on 14 nm process technology. Socket: FCBGA1310. Thermal design power (TDP): 31 Watt. Memory support: DDR4: 2400. Passmark benchmark score: 3,929 points. Launch price was $449.

FX-6120

The FX-6120 is manufactured by AMD. It was released in 23 October 2012 (13 years ago). It is based on the Zambezi (2011−2012) architecture. It features 6 cores and 6 threads. Base frequency is 3.6 GHz, with boost up to 4.2 GHz. L3 cache: 8 MB (total). L2 cache: 6 MB. Built on 32 nm process technology. Socket: AM3+. Thermal design power (TDP): 95 Watt. Memory support: DDR3. Passmark benchmark score: 3,853 points. Launch price was $69.

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Processing Power

The Atom C3958 packs 16 cores / 16 threads, while the FX-6120 offers 6 cores / 6 threads — the Atom C3958 has 10 more cores. Boost clocks reach 2 GHz on the Atom C3958 versus 4.2 GHz on the FX-6120 — a 71% clock advantage for the FX-6120 (base: 2 GHz vs 3.6 GHz). The Atom C3958 uses the Goldmont (2016−2017) architecture (14 nm), while the FX-6120 uses Zambezi (2011−2012) (32 nm). In PassMark, the Atom C3958 scores 3,929 against the FX-6120's 3,853 — a 2% lead for the Atom C3958. L3 cache: 16 MB on the Atom C3958 vs 8 MB (total) on the FX-6120.

Feature	Atom C3958	FX-6120
Cores / Threads	16 / 16+167%	6 / 6
Boost Clock	2 GHz	4.2 GHz+110%
Base Clock	2 GHz	3.6 GHz+80%
L3 Cache	16 MB+100%	8 MB (total)
L2 Cache	16 MB+167%	6 MB
Process	14 nm-56%	32 nm
Architecture	Goldmont (2016−2017)	Zambezi (2011−2012)
PassMark	3,929+2%	3,853

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Memory & Platform

The Atom C3958 uses the FCBGA1310 socket (PCIe 3.0), while the FX-6120 uses AM3+ (PCIe 2.0) — making them incompatible on the same motherboard.

Feature	Atom C3958	FX-6120
Socket	FCBGA1310	AM3+
PCIe Generation	PCIe 3.0+50%	PCIe 2.0
Max RAM Speed	DDR4-2400	—
Max RAM Capacity	256 GB	—
RAM Channels	2	—
ECC Support	Yes	—
PCIe Lanes	12	—