GeForce GT 645 vs GeForce GTX 670MX

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 645 vs GeForce GTX 670MX 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 645 vs GeForce GTX 670MX: 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 645

2012

Why buy it

✅Delivers 100+% more G3D Mark for each dollar spent, at 20.3 vs 0 G3D/$ ($99 MSRP vs Unknown MSRP).
✅Draws 32W instead of 75W, a 43W reduction.

Trade-offs

❌Lower average FPS than GeForce GTX 670MX across 50 tracked games in our benchmark data.
❌Less VRAM, with 2 GB vs 3 GB for high-resolution textures and newer games.
❌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 GTX 670MX

2012

Why buy it

✅82.2% more average FPS across 50 tracked games in our benchmark data.
✅50% more VRAM for high-resolution textures and newer games (3 GB vs 2 GB).
✅More future proof: Kepler (2012−2018) on 28nm with a newer platform for upcoming games.

Trade-offs

❌2012 hardware with 3 GB of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.
❌Lower G3D Mark per dollar, at 0 vs 20.3 G3D/$ (Unknown MSRP vs $99 MSRP).
❌134.4% higher power demand at 75W vs 32W.

Quick Answers

Which GPU is faster for gaming right now?

GeForce GTX 670MX is the faster gaming card right now. In our data, it leads by 82.2% in average FPS across 50 tracked games in our benchmark data. PassMark G3D leans toward GeForce GT 645 instead at 2,006 vs 1,978, so for this question the real-game FPS result matters more than the synthetic split.

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

GeForce GT 645 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 645 makes the most sense today based on the pricing and value data we have for this matchup. GeForce GTX 670MX still makes more sense if max raw gaming performance matters more than value.

GeForce GT 645 vs GeForce GTX 670MX Technical Specifications

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

GeForce GT 645

The GeForce GT 645 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: 2,006 points.

GeForce GTX 670MX

The GeForce GTX 670MX is manufactured by NVIDIA. It was released in October 1 2012. It features the Kepler architecture. The core clock speed is 600 MHz. It has 960 shading units. The thermal design power (TDP) is 75W. Manufactured using 28 nm process technology. G3D Mark benchmark score: 1,978 points.

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Graphics Performance

The GeForce GT 645 scores 2,006 and the GeForce GTX 670MX reaches 1,978 in the G3D Mark benchmark — just a 1.4% difference, making them near-identical in rasterization performance. The GeForce GT 645 is built on Kepler while the GeForce GTX 670MX uses Kepler, both on a 28 nm process. Shader units: 384 (GeForce GT 645) vs 960 (GeForce GTX 670MX). Raw compute: 0.5445 TFLOPS (GeForce GT 645) vs 1.154 TFLOPS (GeForce GTX 670MX).

Feature	GeForce GT 645	GeForce GTX 670MX
G3D Mark Score	2,006+1%	1,978
Architecture	Kepler	Kepler
Process Node	28 nm	28 nm
Shading Units	384	960+150%
Compute (TFLOPS)	0.5445 TFLOPS	1.154 TFLOPS+112%
ROPs	16	24+50%
TMUs	32	80+150%
L1 Cache	32 KB	80 KB+150%
L2 Cache	256 KB	384 KB+50%

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Advanced Features (DLSS/FSR)

Feature	GeForce GT 645	GeForce GTX 670MX
Upscaling Tech	Upscaling support	Upscaling support
Frame Generation	Not Supported	Not Supported
Ray Reconstruction	No	No
Low Latency	NVIDIA Reflex	NVIDIA Reflex

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Video Memory (VRAM)

The GeForce GT 645 has 2 GB of VRAM, while the GeForce GTX 670MX carries 3 GB. GeForce GTX 670MX gives you 50% more memory capacity, which matters more once you move into heavier textures, mods, or higher resolutions. Memory bus width is 128-bit on the GeForce GT 645 and 128-bit on the GeForce GTX 670MX. L2 Cache: 256 KB (GeForce GT 645) vs 384 KB (GeForce GTX 670MX) — the GeForce GTX 670MX has significantly larger on-die cache to reduce VRAM reliance.

Feature	GeForce GT 645	GeForce GTX 670MX
VRAM Capacity	2 GB	3 GB+50%
Memory Type	GDDR5	GDDR5
Memory Bandwidth	Unknown	Unknown
Bus Width	128-bit	128-bit
L2 Cache	256 KB	384 KB+50%

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Display & API Support

DirectX support: 12 (11_0) (GeForce GT 645) vs 12 (11_0) (GeForce GTX 670MX). Vulkan: 1.2 vs 1.2. OpenGL: 4.6 vs 4.2. Maximum simultaneous displays: 3 vs 4.

Feature	GeForce GT 645	GeForce GTX 670MX
DirectX	12 (11_0)	12 (11_0)
Vulkan	1.2	1.2
OpenGL	4.6+10%	4.2
Max Displays	3	4+33%

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Media & Encoding

Hardware encoder: NVENC (1st Gen) (GeForce GT 645) vs NVENC 1st Gen (GeForce GTX 670MX). Decoder: NVDEC (1st Gen) vs PureVideo HD VP5. Supported codecs: H.264,MPEG-2,VC-1 (GeForce GT 645) vs H.264,VC-1,MPEG-2,MPEG-4 ASP (GeForce GTX 670MX).

Feature	GeForce GT 645	GeForce GTX 670MX
Encoder	NVENC (1st Gen)	NVENC 1st Gen
Decoder	NVDEC (1st Gen)	PureVideo HD VP5
Codecs	H.264,MPEG-2,VC-1	H.264,VC-1,MPEG-2,MPEG-4 ASP

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Power & Dimensions

The GeForce GT 645 draws 32W versus the GeForce GTX 670MX's 75W — a 80.4% difference. The GeForce GT 645 is more power-efficient. Recommended PSU: 350W (GeForce GT 645) vs 350W (GeForce GTX 670MX). Power connectors: PCIe-powered vs 1x 6-pin. Typical load temperature: 80 vs 85°C.

Feature	GeForce GT 645	GeForce GTX 670MX
TDP	32W-57%	75W
Recommended PSU	350W	350W
Power Connector	PCIe-powered	1x 6-pin
Length	145mm	—
Height	111mm	—
Slots	1	0-100%
Temp (Load)	80-6%	85°C
Perf/Watt	62.7+138%	26.4