T400 vs GeForce 840A

Place in the ranking	851	532
Place by popularity	not in top-100	not in top-100
Power efficiency	6.19	22.09
Architecture	Maxwell (2014−2017)	Turing (2018−2022)
GPU code name	GM108	TU117
Market segment	Laptop	Workstation
Release date	17 March 2014 (11 years ago)	6 May 2021 (4 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	384	384
Core clock speed	1029 MHz	420 MHz
Boost clock speed	1124 MHz	1425 MHz
Number of transistors	no data	4,700 million
Manufacturing process technology	28 nm	12 nm
Power consumption (TDP)	33 Watt	30 Watt
Texture fill rate	17.98	34.20
Floating-point processing power	0.8632 TFLOPS	1.094 TFLOPS
ROPs	8	16
TMUs	16	24
L1 Cache	192 KB	384 KB
L2 Cache	1024 KB	1024 KB

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).

Interface	PCIe 3.0 x8	PCIe 3.0 x16
Width	no data	1-slot
Supplementary power connectors	no data	None

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	DDR3	GDDR6
Maximum RAM amount	2 GB	2 GB
Memory bus width	64 Bit	64 Bit
Memory clock speed	1001 MHz	1250 MHz
Memory bandwidth	16.02 GB/s	80 GB/s

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

3x mini-DisplayPort

API and SDK support

List of supported 3D and general-purpose computing APIs, including their specific versions.

DirectX	12 (11_0)	12 (12_1)
Shader Model	5.1	6.6
OpenGL	4.6	4.6
OpenCL	1.2	3.0
Vulkan	1.1.126	1.2
CUDA	5.0	7.5

Synthetic benchmarks

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.

GeForce 840A 2.66

T400 8.63
+224%

Passmark

This is the most ubiquitous GPU benchmark. It gives the graphics card a thorough evaluation under various types of load, providing four separate benchmarks for Direct3D versions 9, 10, 11 and 12 (the last being done in 4K resolution if possible), and few more tests engaging DirectCompute capabilities.

GeForce 840A 1114
Samples: 40

T400 3610
+224%

Samples: 244

GeekBench 5 OpenCL

Geekbench 5 is a widespread graphics card benchmark combined from 11 different test scenarios. All these scenarios rely on direct usage of GPU's processing power, no 3D rendering is involved. This variation uses OpenCL API by Khronos Group.

GeForce 840A 5596

T400 17077
+205%

Gaming performance

Let's see how good the compared graphics cards are for gaming. Particular gaming benchmark results are measured in FPS.

Pros & cons summary

Performance score	2.66	8.63
Recency	17 March 2014	6 May 2021
Chip lithography	28 nm	12 nm
Power consumption (TDP)	33 Watt	30 Watt

T400 has a 224.4% higher aggregate performance score, an age advantage of 7 years, a 133.3% more advanced lithography process, and 10% lower power consumption.

The T400 is our recommended choice as it beats the GeForce 840A in performance tests.

Be aware that GeForce 840A is a notebook graphics card while T400 is a workstation one.