GeForce GT 640M vs GeForce GT 645M

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 GT 640M vs GeForce GT 645M 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 GT 640M vs GeForce GT 645M: 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 GT 640M

2012

Why buy it

✅Competitive enough if your priority is price, power, or specific feature preference.

Trade-offs

❌Lower average FPS than GeForce GT 645M across 50 tracked games in our benchmark data.
❌2012 hardware with 2 GB of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.

GeForce GT 645M

2012

Why buy it

✅4.4% more average FPS across 50 tracked games in our benchmark data.

Trade-offs

❌2012 hardware with 2 GB of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.

Quick Answers

Which GPU is faster for gaming right now?

GeForce GT 645M is the faster gaming card right now. In our data, it leads by 4.4% in average FPS across 50 tracked games in our benchmark data and by 4.2% in PassMark G3D (945 vs 907), so the answer here is pretty clean.

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

GeForce GT 640M is the safer long-term pick for 2026 and beyond because it comes out ahead on the available hardware-headroom signals for this matchup.

Which GPU is the better buy today?

GeForce GT 645M makes the most sense today based on the pricing and value data we have for this matchup. If you are mainly targeting 1080p and some 1440p, GeForce GT 645M is the easier value choice. If you care more about 1080p and some 1440p headroom, GeForce GT 640M has the stronger long-term case.

GeForce GT 640M vs GeForce GT 645M Technical Specifications

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

GeForce GT 640M

The GeForce GT 640M is manufactured by NVIDIA. It was released in March 22 2012. It features the Kepler architecture. The core clock ranges from Up to 625 MHz to 645 MHz. It has 384 shading units. The thermal design power (TDP) is 32W. Manufactured using 28 nm process technology. G3D Mark benchmark score: 907 points.

GeForce GT 645M

The GeForce GT 645M is manufactured by NVIDIA. It was released in October 1 2012. It features the Kepler architecture. The core clock speed is Up to 710 MHz. It has 384 shading units. The thermal design power (TDP) is 32W. Manufactured using 28 nm process technology. G3D Mark benchmark score: 945 points.

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Graphics Performance

The GeForce GT 640M scores 907 and the GeForce GT 645M reaches 945 in the G3D Mark benchmark — just a 4.2% difference, making them near-identical in rasterization performance. The GeForce GT 640M is built on Kepler while the GeForce GT 645M uses Kepler, both on a 28 nm process. Shader units: 384 (GeForce GT 640M) vs 384 (GeForce GT 645M). Raw compute: 0.48 TFLOPS (GeForce GT 640M) vs 0.5445 TFLOPS (GeForce GT 645M).

Feature	GeForce GT 640M	GeForce GT 645M
G3D Mark Score	907	945+4%
Architecture	Kepler	Kepler
Process Node	28 nm	28 nm
Shading Units	384	384
Compute (TFLOPS)	0.48 TFLOPS	0.5445 TFLOPS+13%
ROPs	16	16
TMUs	32	32
L1 Cache	32 KB	32 KB
L2 Cache	256 KB	256 KB

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Advanced Features (DLSS/FSR)

Feature	GeForce GT 640M	GeForce GT 645M
Upscaling Tech	Upscaling support	Upscaling support
Frame Generation	Not Supported	Not Supported
Ray Reconstruction	No	No
Low Latency	NVIDIA Reflex	NVIDIA Reflex

💾

Video Memory (VRAM)

Both cards ship with 2 GB of GDDR5. Memory bus width is 128-bit on the GeForce GT 640M and 128-bit on the GeForce GT 645M.

Feature	GeForce GT 640M	GeForce GT 645M
VRAM Capacity	2 GB	2 GB
Memory Type	GDDR5	GDDR5
Memory Bandwidth	Unknown	Unknown
Bus Width	128-bit	128-bit
L2 Cache	256 KB	256 KB

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Display & API Support

DirectX support: 11.0 (GeForce GT 640M) vs 11.0 (GeForce GT 645M). Vulkan: 1.1 vs 1.1. OpenGL: 4.5 vs 4.5. Maximum simultaneous displays: 1 vs 1.

Feature	GeForce GT 640M	GeForce GT 645M
DirectX	11.0	11.0
Vulkan	1.1	1.1
OpenGL	4.5	4.5
Max Displays	1	1

🎬

Media & Encoding

Hardware encoder: NVENC 1.0 (GeForce GT 640M) vs NVENC 1.0 (GeForce GT 645M). Decoder: PureVideo HD VP5 vs PureVideo HD VP5. Supported codecs: MPEG-2,H.264,VC-1,MPEG-4 ASP (GeForce GT 640M) vs MPEG-2,H.264,VC-1,MPEG-4 ASP (GeForce GT 645M).

Feature	GeForce GT 640M	GeForce GT 645M
Encoder	NVENC 1.0	NVENC 1.0
Decoder	PureVideo HD VP5	PureVideo HD VP5
Codecs	MPEG-2,H.264,VC-1,MPEG-4 ASP	MPEG-2,H.264,VC-1,MPEG-4 ASP

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Power & Dimensions

The GeForce GT 640M draws 32W versus the GeForce GT 645M's 32W — a 0% difference. The GeForce GT 645M is more power-efficient. Recommended PSU: 350W (GeForce GT 640M) vs 350W (GeForce GT 645M). Power connectors: PCIe-powered vs PCIe-powered. Card length: 0mm vs 0mm, occupying 0 vs 0 slots. Typical load temperature: 70°C vs 70°C.