GeForce GT 645M vs ATI Mobility Radeon HD 3870 X2
Aggregate performance score
We've compared Mobility Radeon HD 3870 X2 and GeForce GT 645M, covering specs and all relevant benchmarks.
GT 645M outperforms ATI Mobility HD 3870 X2 by a small 9% based on our aggregate benchmark results.
Primary details
GPU architecture, market segment, value for money and other general parameters compared.
| Place in the ranking | 853 | 838 |
| Place by popularity | not in top-100 | not in top-100 |
| Power efficiency | 1.40 | 5.23 |
| Architecture | TeraScale (2005−2013) | Kepler (2012−2018) |
| GPU code name | M88 | GK107 |
| Market segment | Laptop | Laptop |
| Release date | 1 September 2008 (16 years ago) | 1 October 2012 (12 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 | 384 |
| Core clock speed | 660 MHz | Up to 710 MHz |
| Number of transistors | 666 million | 1,270 million |
| Manufacturing process technology | 55 nm | 28 nm |
| Power consumption (TDP) | 110 Watt | 32 Watt |
| Texture fill rate | 10.56 | 22.69 |
| Floating-point processing power | 0.4224 TFLOPS | 0.5445 TFLOPS |
| ROPs | 16 | 16 |
| TMUs | 16 | 32 |
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 | medium sized |
| Bus support | no data | PCI Express 2.0, PCI Express 3.0 |
| Interface | PCIe 2.0 x16 | PCIe 3.0 x16 |
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 | DDR3\GDDR5 |
| Maximum RAM amount | 512 MB | 2 GB |
| Memory bus width | 256 Bit | 128bit |
| Memory clock speed | 850 MHz | 900 MHz |
| Memory bandwidth | 54.4 GB/s | Up to 64.0 GB/s |
| Shared memory | - | - |
Connectivity and outputs
Types and number of video connectors present on the reviewed GPUs. As a rule, data in this section is precise only for desktop reference ones (so-called Founders Edition for NVIDIA chips). OEM manufacturers may change the number and type of output ports, while for notebook cards availability of certain video outputs ports depends on the laptop model rather than on the card itself.
| Display Connectors | No outputs | No outputs |
| HDMI | - | + |
| HDCP | - | + |
| Maximum VGA resolution | no data | Up to 2048x1536 |
Supported technologies
Supported technological solutions. This information will prove useful if you need some particular technology for your purposes.
| 3D Blu-Ray | - | + |
| Optimus | - | + |
API compatibility
List of supported 3D and general-purpose computing APIs, including their specific versions.
| DirectX | 10.1 (10_1) | 12 API |
| Shader Model | 4.1 | 5.1 |
| OpenGL | 3.3 | 4.5 |
| OpenCL | N/A | 1.1 |
| Vulkan | N/A | 1.1.126 |
| CUDA | - | + |
Synthetic benchmark performance
Non-gaming benchmark results comparison. The combined score is measured on a 0-100 point scale.
Combined synthetic benchmark score
This is our combined benchmark score. We are regularly improving our combining algorithms, but if you find some perceived inconsistencies, feel free to speak up in comments section, we usually fix problems quickly.
3DMark Vantage Performance
3DMark Vantage is an outdated DirectX 10 benchmark using 1280x1024 screen resolution. It taxes the graphics card with two scenes, one depicting a girl escaping some militarized base located within a sea cave, the other displaying a space fleet attack on a defenseless planet. It was discontinued in April 2017, and Time Spy benchmark is now recommended to be used instead.
Gaming performance
Let's see how good the compared graphics cards are for gaming. Particular gaming benchmark results are measured in FPS.
Average FPS across all PC games
Here are the average frames per second in a large set of popular games across different resolutions:
| 900p | 27−30
−11.1%
| 30
+11.1%
|
| Full HD | 21−24
−9.5%
| 23
+9.5%
|
FPS performance in popular games
Full HD
Low Preset
| Cyberpunk 2077 | 5−6
+0%
|
5−6
+0%
|
Full HD
Medium Preset
| Assassin's Creed Odyssey | 8−9
+0%
|
8−9
+0%
|
| Battlefield 5 | 2−3
−50%
|
3−4
+50%
|
| Call of Duty: Modern Warfare | 6−7
+0%
|
6−7
+0%
|
| Cyberpunk 2077 | 5−6
+0%
|
5−6
+0%
|
| Far Cry 5 | 4−5
+0%
|
4−5
+0%
|
| Far Cry New Dawn | 6−7
+0%
|
6−7
+0%
|
| Forza Horizon 4 | 10−11
−10%
|
10−12
+10%
|
| Hitman 3 | 7−8
+0%
|
7−8
+0%
|
| Horizon Zero Dawn | 18−20
−5.3%
|
20−22
+5.3%
|
| Metro Exodus | 0−1 | 1−2 |
| Red Dead Redemption 2 | 5−6
+0%
|
5−6
+0%
|
| Shadow of the Tomb Raider | 10−11
−10%
|
10−12
+10%
|
| Watch Dogs: Legion | 35−40
−2.8%
|
35−40
+2.8%
|
Full HD
High Preset
| Assassin's Creed Odyssey | 8−9
+0%
|
8−9
+0%
|
| Battlefield 5 | 2−3
−50%
|
3−4
+50%
|
| Call of Duty: Modern Warfare | 6−7
+0%
|
6−7
+0%
|
| Cyberpunk 2077 | 5−6
+0%
|
5−6
+0%
|
| Far Cry 5 | 4−5
+0%
|
4−5
+0%
|
| Far Cry New Dawn | 6−7
+0%
|
6−7
+0%
|
| Forza Horizon 4 | 10−11
−10%
|
10−12
+10%
|
| Hitman 3 | 7−8
+0%
|
7−8
+0%
|
| Horizon Zero Dawn | 18−20
−5.3%
|
20−22
+5.3%
|
| Metro Exodus | 0−1 | 1−2 |
| Red Dead Redemption 2 | 5−6
+0%
|
5−6
+0%
|
| Shadow of the Tomb Raider | 10−11
−10%
|
10−12
+10%
|
| The Witcher 3: Wild Hunt | 12−14
+0%
|
12−14
+0%
|
| Watch Dogs: Legion | 35−40
−2.8%
|
35−40
+2.8%
|
Full HD
Ultra Preset
| Assassin's Creed Odyssey | 8−9
+0%
|
8−9
+0%
|
| Call of Duty: Modern Warfare | 6−7
+0%
|
6−7
+0%
|
| Cyberpunk 2077 | 5−6
+0%
|
5−6
+0%
|
| Far Cry 5 | 4−5
+0%
|
4−5
+0%
|
| Forza Horizon 4 | 10−11
−10%
|
10−12
+10%
|
| Hitman 3 | 7−8
+0%
|
7−8
+0%
|
| Horizon Zero Dawn | 18−20
−5.3%
|
20−22
+5.3%
|
| Shadow of the Tomb Raider | 10−11
−10%
|
10−12
+10%
|
| The Witcher 3: Wild Hunt | 12−14
+0%
|
12−14
+0%
|
| Watch Dogs: Legion | 35−40
−2.8%
|
35−40
+2.8%
|
Full HD
Epic Preset
| Red Dead Redemption 2 | 5−6
+0%
|
5−6
+0%
|
1440p
High Preset
| Battlefield 5 | 3−4
−33.3%
|
4−5
+33.3%
|
| Far Cry New Dawn | 3−4
−33.3%
|
4−5
+33.3%
|
1440p
Ultra Preset
| Assassin's Creed Odyssey | 2−3
+0%
|
2−3
+0%
|
| Call of Duty: Modern Warfare | 1−2
+0%
|
1−2
+0%
|
| Cyberpunk 2077 | 1−2
+0%
|
1−2
+0%
|
| Far Cry 5 | 2−3
−50%
|
3−4
+50%
|
| Hitman 3 | 7−8
+0%
|
7−8
+0%
|
| Horizon Zero Dawn | 6−7
+0%
|
6−7
+0%
|
| The Witcher 3: Wild Hunt | 1−2
−100%
|
2−3
+100%
|
| Watch Dogs: Legion | 12−14
−16.7%
|
14−16
+16.7%
|
1440p
Epic Preset
| Red Dead Redemption 2 | 5−6
+0%
|
5−6
+0%
|
4K
High Preset
| Battlefield 5 | 0−1 | 0−1 |
| Far Cry New Dawn | 1−2
+0%
|
1−2
+0%
|
4K
Ultra Preset
| Assassin's Creed Odyssey | 2−3
+0%
|
2−3
+0%
|
| Assassin's Creed Valhalla | 1−2
+0%
|
1−2
+0%
|
| Call of Duty: Modern Warfare | 1−2
+0%
|
1−2
+0%
|
| Far Cry 5 | 1−2
+0%
|
1−2
+0%
|
| Watch Dogs: Legion | 0−1 | 0−1 |
4K
Epic Preset
| Red Dead Redemption 2 | 3−4
+0%
|
3−4
+0%
|
This is how ATI Mobility HD 3870 X2 and GT 645M compete in popular games:
- GT 645M is 11% faster in 900p
- GT 645M is 10% faster in 1080p
Here's the range of performance differences observed across popular games:
- in The Witcher 3: Wild Hunt, with 1440p resolution and the Ultra Preset, the GT 645M is 100% faster.
All in all, in popular games:
- GT 645M is ahead in 19 tests (35%)
- there's a draw in 35 tests (65%)
Pros & cons summary
| Performance score | 2.22 | 2.42 |
| Recency | 1 September 2008 | 1 October 2012 |
| Maximum RAM amount | 512 MB | 2 GB |
| Chip lithography | 55 nm | 28 nm |
| Power consumption (TDP) | 110 Watt | 32 Watt |
GT 645M has a 9% higher aggregate performance score, an age advantage of 4 years, a 300% higher maximum VRAM amount, a 96.4% more advanced lithography process, and 243.8% lower power consumption.
Given the minimal performance differences, no clear winner can be declared between Mobility Radeon HD 3870 X2 and GeForce GT 645M.
Should you still have questions concerning choice between the reviewed GPUs, ask them in Comments section, and we shall answer.
Comparisons with similar GPUs
We selected several comparisons of graphics cards with performance close to those reviewed, providing you with more options to consider.
