GeForce 920MX vs GeForce GT 640M: specs and benchmark comparison
Short verdict
Not enough data for a performance conclusion: the database has no comparable benchmarks for this pair. Below are the key differences in official specifications.
Compare with AIAdvantages
Only measured and rated values: a noticeable benchmark gap and specs where more is better.
Where GeForce 920MX is better0
No advantages found in our data.
Where GeForce GT 640M is better0
No advantages found in our data.
Benchmarks
Results are compared within one benchmark, one version and the same conditions. Laptop chip results depend on the laptop model: its maker sets the power limit and cooling.
Blender Benchmark 2.90
GPU, bmw27 (CUDA) · s, lower is better
GeForce 920MX1,216 sGeForce GT 640M1,562.8 sNo advantage conclusion: small sample in one of the results.
About the measurement and source
- A · NVIDIA GeForce 920MX
1,216 s · community measurement, sample 1 · November 14, 2026
Blender Open Data (Blender Foundation)
Median of 1 submissions (0 outliers excluded), interquartile range 1215.99–1215.99; submissions 2020-11-12 to 2020-11-12; CUDA backend. Snapshot 2026-11-14.
- B · NVIDIA GeForce GT 640M
1,562.8 s · community measurement, sample 1 · November 14, 2026
Blender Open Data (Blender Foundation)
Median of 1 submissions (0 outliers excluded), interquartile range 1562.82–1562.82; submissions 2020-11-01 to 2020-11-01; CUDA backend. Snapshot 2026-11-14.
difference = |A − B| ÷ the smaller value × 100%. The 5% noticeable threshold is a UX heuristic, not statistical significance.
Render time of a single Cycles scene without synchronization. Median of submissions after filtering.
Reference results (8)
| Benchmark | A | B | Difference |
|---|---|---|---|
| Blender Benchmark 2.83GPU, bmw27 (CUDA) | 1,200.7 | 1,526.7 | reference |
| Blender Benchmark 2.92GPU, bmw27 (CUDA) | 1,049.6 | — | no pair |
| Blender Benchmark 2.93.1GPU, bmw27 (CUDA) | 822.6 | — | no pair |
| Blender Benchmark 2.90GPU, bmw27 (OPTIX) | 1,532.6 | — | no pair |
| Blender Benchmark 2.82GPU, pavillon_barcelona (CUDA) | 6,440.1 | — | no pair |
| Blender Benchmark 3.5.0GPU, sum of scenes monster + junkshop + classroom (CUDA) | 47.8 | — | no pair |
| Blender Benchmark 2.82GPU, bmw27 (CUDA) | — | 1,397.1 | no pair |
| Blender Benchmark 4.5.0GPU, sum of scenes monster + junkshop + classroom (CUDA) | — | 33 | no pair |
Each benchmark version has its own scale: numbers are compared only within a row.
Specifications
Chip maker values. The laptop maker sets the power limit and clocks in each laptop.
| Specification | A · GeForce 920MX | B · GeForce GT 640M | Difference |
|---|---|---|---|
| Chip | |||
| GPU chip | no data | GK107 | no data for A |
| Architecture | Maxwell | Kepler | differs |
| Shader unitsShader unit counts are comparable only within one architecture. | 256 (CUDA cores) | no data | no data for B |
| Clocks | |||
| Base clock | no data | 625 MHz | no data for A |
| Memory | |||
| Video memory | 2 GB | no data | no data for B |
| Memory bus | no data | 128 bit | no data for A |
| Power and dimensions | |||
| Board powerTGP (NVIDIA) and TBP (AMD/Intel) are calculated differently; higher is not better. For laptops, the chip maker sets the range and the laptop maker picks the value, so the same chip behaves differently in different laptops. | no data | 32 W (TDP) | no data for A |
| Interface | no data | PCIe 3.0 x16 | no data for A |
Chip
GPU chip
Ano data
BGK107
no data for AArchitecture
AMaxwell
BKepler
differsShader units
A256 (CUDA cores)
Bno data
no data for BShader unit counts are comparable only within one architecture.
Clocks
Base clock
Ano data
B625 MHz
no data for A
Memory
Video memory
A2 GB
Bno data
no data for BMemory bus
Ano data
B128 bit
no data for A
Power and dimensions
Board power
Ano data
B32 W (TDP)
no data for ATGP (NVIDIA) and TBP (AMD/Intel) are calculated differently; higher is not better. For laptops, the chip maker sets the range and the laptop maker picks the value, so the same chip behaves differently in different laptops.
Interface
Ano data
BPCIe 3.0 x16
no data for A
“More” does not always mean “better”: higher power draw or size is a system requirement, not an advantage (such bars are dimmed).
Compare with AI
An AI model reviews the specs and benchmarks of this pair and gives a plain-language verdict on who each model suits.
See also
Data sources (2)
- Wikipedia (English) — specifications of NVIDIA GeForce 920MX, specifications of NVIDIA GeForce GT 640M, release date and launch pricechecked November 14, 2026
- Blender Open Data (Blender Foundation) — benchmark Blender Benchmark 2.83, benchmark Blender Benchmark 2.90, benchmark Blender Benchmark 2.92, benchmark Blender Benchmark 2.93.1, benchmark Blender Benchmark 2.82, benchmark Blender Benchmark 3.5.0, benchmark Blender Benchmark 4.5.0checked November 14, 2026
How we compare: methodology. Where the data comes from: sources.