GeForce 820M vs Mobility Radeon HD 3870 X2

G3D Mark is a standard benchmark that measures graphics performance in real-world gaming scenarios. It simplifies comparing cards from different brands, where higher scores directly correlate with better fps and smoother gaming experiences.

GeForce 820M vs Mobility Radeon HD 3870 X2 FPS Benchmarks

Predicted gaming performance across popular games. Tested paired with Ryzen 7 9800X3D to isolate GPU performance.

Search any supported game below to compare 1080p FPS for both components.

GeForce 820M vs Mobility Radeon HD 3870 X2: Pros, Cons & Final Verdict

See where each GPU makes more sense in practice: raw FPS, VRAM, features, power draw, pricing, and long-term headroom.

GeForce 820M

2014

Why buy it

✅99900% more VRAM for high-resolution textures and newer games (2 GB vs 2 MB).
✅Mobility Radeon HD 3870 X2 is already obsolete for modern gaming, so GeForce 820M is the less risky modern option long term.
✅Draws 33W instead of 110W, a 77W reduction.

Trade-offs

❌2014 hardware with 2 GB of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.
❌Lower G3D Mark per dollar, at 0 vs 1.1 G3D/$ (Unknown MSRP vs $449 MSRP).

Mobility Radeon HD 3870 X2

2008

Why buy it

✅Delivers 100+% more G3D Mark for each dollar spent, at 1.1 vs 0 G3D/$ ($449 MSRP vs Unknown MSRP).

Trade-offs

❌Less VRAM, with 2 MB vs 2 GB for high-resolution textures and newer games.
❌2008 hardware with 2 MB of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.
❌233.3% higher power demand at 110W vs 33W.

Quick Answers

Which GPU is faster for gaming right now?

GeForce 820M is the faster gaming card right now based on the synthetic data we have. It leads by 0.8% in PassMark G3D (482 vs 478), which is the best performance signal available in this matchup.

Which GPU is the safer long-term pick for 2026 and beyond?

GeForce 820M is the safer long-term pick for 2026 and beyond. The case is simple: 2 GB vs 2 MB of VRAM, a 28nm process instead of 55nm, and a newer 2014 generation instead of 2008. That gives it more room for heavier textures and higher settings over time.

Which GPU is the better buy today?

Mobility Radeon HD 3870 X2 makes the most sense today based on the pricing and value data we have for this matchup. If you are mainly targeting 1080p, Mobility Radeon HD 3870 X2 is the easier value choice. If you care more about 1080p and some 1440p headroom, GeForce 820M has the stronger long-term case.

GeForce 820M vs Mobility Radeon HD 3870 X2 Technical Specifications

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

GeForce 820M

The GeForce 820M is manufactured by NVIDIA. It was released in March 12 2014. It features the Maxwell architecture. The core clock ranges from 1029 MHz to 1124 MHz. It has 384 shading units. The thermal design power (TDP) is 33W. Manufactured using 28 nm process technology. G3D Mark benchmark score: 482 points.

Mobility Radeon HD 3870 X2

The Mobility Radeon HD 3870 X2 is manufactured by AMD. It was released in September 1 2008. It features the TeraScale architecture. The core clock speed is 660 MHz. It has 320 ×2 shading units. The thermal design power (TDP) is 110W. Manufactured using 55 nm process technology. G3D Mark benchmark score: 478 points.

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Graphics Performance

The GeForce 820M scores 482 and the Mobility Radeon HD 3870 X2 reaches 478 in the G3D Mark benchmark — just a 0.8% difference, making them near-identical in rasterization performance. The GeForce 820M is built on Maxwell while the Mobility Radeon HD 3870 X2 uses TeraScale, both on 28 nm vs 55 nm. Shader units: 384 (GeForce 820M) vs 320 (Mobility Radeon HD 3870 X2). Raw compute: 0.8632 TFLOPS (GeForce 820M) vs 0.4224 TFLOPS ×2 (Mobility Radeon HD 3870 X2).

Feature	GeForce 820M	Mobility Radeon HD 3870 X2
G3D Mark Score	482	478
Architecture	Maxwell	TeraScale
Process Node	28 nm	55 nm
Shading Units	384+20%	320 ×2
Compute (TFLOPS)	0.8632 TFLOPS+104%	0.4224 TFLOPS ×2
ROPs	8	16 ×2+100%
TMUs	16	16 ×2
L2 Cache	1 MB+300%	0.25 MB

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Advanced Features (DLSS/FSR)

The GeForce 820M gets NVIDIA DLSS, which still tends to look cleaner in motion. The Mobility Radeon HD 3870 X2 leans on FSR, which is flexible and widely supported, but usually a bit rougher at the same settings.

Feature	GeForce 820M	Mobility Radeon HD 3870 X2
Upscaling Tech	Upscaling support	FSR Upscaling / FSR 4
Frame Generation	Not Supported	Not Supported
Ray Reconstruction	No	No
Low Latency	NVIDIA Reflex	AMD Anti-Lag

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Video Memory (VRAM)

The GeForce 820M has 2 GB of VRAM, while the Mobility Radeon HD 3870 X2 carries 2 MB. GeForce 820M gives you 99900% more memory capacity, which matters more once you move into heavier textures, mods, or higher resolutions. Memory bus width is 128-bit on the GeForce 820M and 64-bit on the Mobility Radeon HD 3870 X2. L2 Cache: 1 MB (GeForce 820M) vs 0.25 MB (Mobility Radeon HD 3870 X2) — the GeForce 820M has significantly larger on-die cache to reduce VRAM reliance.

Feature	GeForce 820M	Mobility Radeon HD 3870 X2
VRAM Capacity	2 GB+99900%	0.002 GB
Memory Type	GDDR5	GDDR5
Memory Bandwidth	Unknown	Unknown
Bus Width	128-bit+100%	64-bit
L2 Cache	1 MB+300%	0.25 MB

🖥️

Display & API Support

DirectX support: 11.0 (GeForce 820M) vs 10.1 (Mobility Radeon HD 3870 X2). Maximum simultaneous displays: 1 vs 0.

Feature	GeForce 820M	Mobility Radeon HD 3870 X2
DirectX	11.0+9%	10.1
Max Displays	1	0

🎬

Media & Encoding

Hardware encoder: No (GeForce 820M) vs UVD (Mobility Radeon HD 3870 X2). Decoder: PureVideo HD VP4 vs UVD.

Feature	GeForce 820M	Mobility Radeon HD 3870 X2
Encoder	No	UVD
Decoder	PureVideo HD VP4	UVD
Codecs	MPEG-2,H.264,VC-1,MPEG-4 ASP	—

🔌

Power & Dimensions

The GeForce 820M draws 33W versus the Mobility Radeon HD 3870 X2's 110W — a 107.7% difference. The GeForce 820M is more power-efficient. Recommended PSU: 350W (GeForce 820M) vs 350W (Mobility Radeon HD 3870 X2). Power connectors: Legacy vs PCIe-powered. Card length: 0mm vs 1mm, occupying 0 vs 0 slots.

Feature	GeForce 820M	Mobility Radeon HD 3870 X2
TDP	33W-70%	110W
Recommended PSU	350W	350W
Power Connector	Legacy	PCIe-powered
Length	0mm	1mm
Height	0mm	—
Slots	0	0
Temp (Load)	70°C	—
Perf/Watt	14.6+240%	4.3

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Value Analysis

The newer card here is GeForce 820M (2014 vs 2008).

Feature	GeForce 820M	Mobility Radeon HD 3870 X2
MSRP	—	$449
Codename	GM108	M88
Release	March 12 2014	September 1 2008
Ranking	#854	#919

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