Radeon RX 6900 vs ATI Mobility HD 3870
Aggregate performance score
We've compared Mobility Radeon HD 3870 with Radeon RX 6900, including specs and performance data.
RX 6900 outperforms Mobility HD 3870 by a whopping 5048% based on our aggregate benchmark results.
Contents
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 1087 | 36 |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | 1.74 | 19.27 |
| Architecture | TeraScale (2005−2013) | RDNA 2.0 (2020−2025) |
| GPU code name | M88 | Navi 21 |
| Market segment | Laptop | Desktop |
| Release date | 4 June 2008 (17 years ago) | 28 October 2020 (5 years ago) |
Detailed specifications
General parameters such as number of shaders, GPU core base clock and boost clock speeds, manufacturing process, texturing and calculation speed. Note that power consumption of some graphics cards can well exceed their nominal TDP, especially when overclocked.
| Pipelines / CUDA cores | 320 | 4608 |
| Core clock speed | 660 MHz | no data |
| Boost clock speed | no data | 2105 MHz |
| Number of transistors | 666 million | 23,000 million |
| Manufacturing process technology | 55 nm | 7 nm |
| Power consumption (TDP) | 55 Watt | 255 Watt |
| Texture fill rate | 10.56 | 606.2 |
| Floating-point processing power | 0.4224 TFLOPS | 19.4 TFLOPS |
| ROPs | 16 | 64 |
| TMUs | 16 | 288 |
| L2 Cache | 256 KB | no data |
Form factor & compatibility
Information on compatibility with other computer components. Useful when choosing a future computer configuration or upgrading an existing one. For desktop graphics cards it's interface and bus (motherboard compatibility), additional power connectors (power supply compatibility).
| Laptop size | large | no data |
| Interface | PCIe 2.0 x16 | PCIe 4.0 x16 |
| Width | no data | 2-slot |
| Supplementary power connectors | no data | 2x 8-pin |
VRAM capacity and type
Parameters of VRAM installed: its type, size, bus, clock and resulting bandwidth. Integrated GPUs have no dedicated video RAM and use a shared part of system RAM.
| Memory type | GDDR3 | GDDR6 |
| Maximum RAM amount | 512 MB | 16 GB |
| Memory bus width | 256 Bit | 256 Bit |
| Memory clock speed | 850 MHz | 16 GB/s |
| Memory bandwidth | 54.4 GB/s | 512.0 GB/s |
| Shared memory | - | - |
| Resizable BAR | - | + |
Connectivity and outputs
This section shows the types and number of video connectors on each GPU. The data applies specifically to desktop reference models (for example, NVIDIA’s Founders Edition). OEM partners often modify both the number and types of ports. On notebook GPUs, video‐output options are determined by the laptop’s design rather than the graphics chip itself.
| Display Connectors | No outputs | 1x HDMI, 2x DisplayPort, 1x USB Type-C |
| HDMI | - | + |
API and SDK support
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 10.1 (10_1) | 12 Ultimate (12_2) |
| Shader Model | 4.1 | 6.5 |
| OpenGL | 3.3 | 4.6 |
| OpenCL | N/A | 2.0 |
| Vulkan | N/A | 1.2 |
Gaming performance
Let's see how good the compared graphics cards are for gaming. Particular gaming benchmark results are measured in FPS.
FPS performance in popular games
Full HD
Low
| Cyberpunk 2077 | 3−4
−4900%
|
150−160
+4900%
|
| Resident Evil 4 Remake | 0−1 | 0−1 |
Full HD
Medium
| Battlefield 5 | 1−2
−4900%
|
50−55
+4900%
|
| Cyberpunk 2077 | 3−4
−4900%
|
150−160
+4900%
|
| Far Cry 5 | 2−3
−4900%
|
100−105
+4900%
|
| Fortnite | 3−4
−4900%
|
150−160
+4900%
|
| Forza Horizon 4 | 8−9
−4900%
|
400−450
+4900%
|
| Forza Horizon 5 | 1−2
−4900%
|
50−55
+4900%
|
| PLAYERUNKNOWN'S BATTLEGROUNDS | 9−10
−4900%
|
450−500
+4900%
|
| Valorant | 30−35
−4900%
|
1650−1700
+4900%
|
Full HD
High
| Battlefield 5 | 1−2
−4900%
|
50−55
+4900%
|
| Counter-Strike: Global Offensive | 27−30
−4900%
|
1450−1500
+4900%
|
| Cyberpunk 2077 | 3−4
−4900%
|
150−160
+4900%
|
| Dota 2 | 16−18
−4900%
|
800−850
+4900%
|
| Far Cry 5 | 2−3
−4900%
|
100−105
+4900%
|
| Fortnite | 3−4
−4900%
|
150−160
+4900%
|
| Forza Horizon 4 | 8−9
−4900%
|
400−450
+4900%
|
| Forza Horizon 5 | 1−2
−4900%
|
50−55
+4900%
|
| Grand Theft Auto V | 0−1 | 0−1 |
| Metro Exodus | 2−3
−4900%
|
100−105
+4900%
|
| PLAYERUNKNOWN'S BATTLEGROUNDS | 9−10
−4900%
|
450−500
+4900%
|
| The Witcher 3: Wild Hunt | 7−8
−4900%
|
350−400
+4900%
|
| Valorant | 30−35
−4900%
|
1650−1700
+4900%
|
Full HD
Ultra
| Battlefield 5 | 1−2
−4900%
|
50−55
+4900%
|
| Cyberpunk 2077 | 3−4
−4900%
|
150−160
+4900%
|
| Dota 2 | 16−18
−4900%
|
800−850
+4900%
|
| Far Cry 5 | 2−3
−4900%
|
100−105
+4900%
|
| Forza Horizon 4 | 8−9
−4900%
|
400−450
+4900%
|
| PLAYERUNKNOWN'S BATTLEGROUNDS | 9−10
−4900%
|
450−500
+4900%
|
| The Witcher 3: Wild Hunt | 7−8
−4900%
|
350−400
+4900%
|
| Valorant | 30−35
−4900%
|
1650−1700
+4900%
|
Full HD
Epic
| Fortnite | 3−4
−4900%
|
150−160
+4900%
|
1440p
High
| Counter-Strike 2 | 4−5
−4900%
|
200−210
+4900%
|
| Counter-Strike: Global Offensive | 8−9
−4900%
|
400−450
+4900%
|
| PLAYERUNKNOWN'S BATTLEGROUNDS | 12−14
−4900%
|
650−700
+4900%
|
| Valorant | 3−4
−4900%
|
150−160
+4900%
|
1440p
Ultra
| Cyberpunk 2077 | 0−1 | 0−1 |
| Far Cry 5 | 1−2
−4900%
|
50−55
+4900%
|
| Forza Horizon 4 | 3−4
−4900%
|
150−160
+4900%
|
| The Witcher 3: Wild Hunt | 2−3
−4900%
|
100−105
+4900%
|
1440p
Epic
| Fortnite | 2−3
−4900%
|
100−105
+4900%
|
4K
High
| Grand Theft Auto V | 14−16
−4900%
|
700−750
+4900%
|
| Valorant | 6−7
−4900%
|
300−310
+4900%
|
4K
Ultra
| Dota 2 | 1−2
−4900%
|
50−55
+4900%
|
| PLAYERUNKNOWN'S BATTLEGROUNDS | 2−3
−4900%
|
100−105
+4900%
|
4K
Epic
| Fortnite | 2−3
−4900%
|
100−105
+4900%
|
Pros & cons summary
| Performance score | 1.24 | 63.83 |
| Recency | 4 June 2008 | 28 October 2020 |
| Maximum RAM amount | 512 MB | 16 GB |
| Chip lithography | 55 nm | 7 nm |
| Power consumption (TDP) | 55 Watt | 255 Watt |
ATI Mobility HD 3870 has 364% lower power consumption.
RX 6900, on the other hand, has a 5048% higher aggregate performance score, an age advantage of 12 years, a 3100% higher maximum VRAM amount, and a 686% more advanced lithography process.
The Radeon RX 6900 is our recommended choice as it beats the Mobility Radeon HD 3870 in performance tests.
Be aware that Mobility Radeon HD 3870 is a notebook graphics card while Radeon RX 6900 is a desktop one.
Other comparisons
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