GeForce GT 645M vs Radeon 620

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 645M vs Radeon 620 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 645M vs Radeon 620: 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 645M

2012

Why buy it

✅300% more VRAM for high-resolution textures and newer games (2 GB vs 512 MB).
✅Draws 32W instead of 50W, a 18W reduction.

Trade-offs

❌Lower average FPS than Radeon 620 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.
❌Lower G3D Mark per dollar, at 0 vs 9.5 G3D/$ (Unknown MSRP vs $100 MSRP).

Radeon 620

2019

Why buy it

✅5.8% more average FPS across 50 tracked games in our benchmark data.
✅Delivers 100+% more G3D Mark for each dollar spent, at 9.5 vs 0 G3D/$ ($100 MSRP vs Unknown MSRP).
✅GeForce GT 645M is already obsolete for modern gaming, so Radeon 620 is the less risky modern option long term.

Trade-offs

❌Less VRAM, with 512 MB vs 2 GB for high-resolution textures and newer games.
❌2019 hardware with 512 MB of VRAM already sits in legacy territory for modern games.
❌56.3% higher power demand at 50W vs 32W.

Quick Answers

Which GPU is faster for gaming right now?

Radeon 620 is the faster gaming card right now. In our data, it leads by 5.8% in average FPS across 50 tracked games in our benchmark data and by 1% in PassMark G3D (954 vs 945), so the answer here is pretty clean.

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

Radeon 620 is the safer long-term pick for 2026 and beyond. The case is simple: the newer upscaling stack, FSR Upscaling / FSR 4 (2025) instead of no meaningful modern upscaling stack and a newer 2019 generation instead of 2012. That makes it the less risky pick as game demands keep moving.

Which GPU is the better buy today?

Radeon 620 makes the most sense today based on the pricing and value data we have for this matchup.

GeForce GT 645M vs Radeon 620 Technical Specifications

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

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.

Radeon 620

The Radeon 620 is manufactured by AMD. It was released in May 13 2019. It features the GCN 3.0 architecture. The core clock ranges from 730 MHz to 1024 MHz. It has 384 shading units. The thermal design power (TDP) is 50W. Manufactured using 28 nm process technology. G3D Mark benchmark score: 954 points.

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Graphics Performance

The GeForce GT 645M scores 945 and the Radeon 620 reaches 954 in the G3D Mark benchmark — just a 1% difference, making them near-identical in rasterization performance. The GeForce GT 645M is built on Kepler while the Radeon 620 uses GCN 3.0, both on a 28 nm process. Shader units: 384 (GeForce GT 645M) vs 384 (Radeon 620). Raw compute: 0.5445 TFLOPS (GeForce GT 645M) vs 0.7864 TFLOPS (Radeon 620).

Feature	GeForce GT 645M	Radeon 620
G3D Mark Score	945	954
Architecture	Kepler	GCN 3.0
Process Node	28 nm	28 nm
Shading Units	384	384
Compute (TFLOPS)	0.5445 TFLOPS	0.7864 TFLOPS+44%
ROPs	16+100%	8
TMUs	32+33%	24
L1 Cache	32 KB	96 KB+200%
L2 Cache	256 KB+100%	128 KB

✨

Advanced Features (DLSS/FSR)

The GeForce GT 645M gets NVIDIA DLSS, which still tends to look cleaner in motion. The Radeon 620 leans on FSR, which is flexible and widely supported, but usually a bit rougher at the same settings.

Feature	GeForce GT 645M	Radeon 620
Upscaling Tech	Upscaling support	FSR Upscaling / FSR 4
Frame Generation	Not Supported	Not Supported
Ray Reconstruction	No	No
Low Latency	NVIDIA Reflex	AMD Anti-Lag

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Video Memory (VRAM)

The GeForce GT 645M has 2 GB of VRAM, while the Radeon 620 carries 512 MB. GeForce GT 645M gives you 300% 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 645M and 128-bit on the Radeon 620. L2 Cache: 256 KB (GeForce GT 645M) vs 128 KB (Radeon 620) — the GeForce GT 645M has significantly larger on-die cache to reduce VRAM reliance.

Feature	GeForce GT 645M	Radeon 620
VRAM Capacity	2 GB+300%	0.5 GB
Memory Type	GDDR5	GDDR5
Memory Bandwidth	Unknown	Unknown
Bus Width	128-bit	128-bit
L2 Cache	256 KB+100%	128 KB

🔌

Power & Dimensions

The GeForce GT 645M draws 32W versus the Radeon 620's 50W — a 43.9% difference. The GeForce GT 645M is more power-efficient. Recommended PSU: 350W (GeForce GT 645M) vs 350W (Radeon 620). Power connectors: PCIe-powered vs PCIe-powered.

Feature	GeForce GT 645M	Radeon 620
TDP	32W-36%	50W
Recommended PSU	350W	350W
Power Connector	PCIe-powered	PCIe-powered
Length	0mm	—
Height	0mm	—
Slots	0	—
Temp (Load)	70°C	—
Perf/Watt	29.5+54%	19.1

💰

Value Analysis

The newer card here is Radeon 620 (2019 vs 2012).

Feature	GeForce GT 645M	Radeon 620
MSRP	—	$100
Codename	GK107	Polaris 24
Release	October 1 2012	May 13 2019
Ranking	#903	#898

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