GeForce GT 645M vs Radeon R7 340

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 R7 340 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 R7 340: 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 100W, a 68W reduction.

Trade-offs

❌Lower average FPS than Radeon R7 340 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 9.7 G3D/$ (Unknown MSRP vs $99 MSRP).

Radeon R7 340

2015

Why buy it

✅119.7% more average FPS across 50 tracked games in our benchmark data.
✅Delivers 100+% more G3D Mark for each dollar spent, at 9.7 vs 0 G3D/$ ($99 MSRP vs Unknown MSRP).

Trade-offs

❌Less VRAM, with 512 MB vs 2 GB for high-resolution textures and newer games.
❌2015 hardware with 512 MB of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.
❌212.5% higher power demand at 100W vs 32W.

Quick Answers

Which GPU is faster for gaming right now?

Radeon R7 340 is the faster gaming card right now. In our data, it leads by 119.7% in average FPS across 50 tracked games in our benchmark data and by 1.6% in PassMark G3D (960 vs 945), so the answer here is pretty clean.

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

GeForce GT 645M is the safer long-term pick for 2026 and beyond. The case is simple: 2 GB vs 512 MB of VRAM. That gives it more room for heavier textures and higher settings over time.

Which GPU is the better buy today?

Radeon R7 340 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, Radeon R7 340 is the easier value choice. If you care more about 1080p and some 1440p headroom, GeForce GT 645M has the stronger long-term case.

GeForce GT 645M vs Radeon R7 340 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 R7 340

The Radeon R7 340 is manufactured by AMD. It was released in June 18 2015. It features the GCN 1.0 architecture. The boost clock speed is 975 MHz. It has 1024 shading units. The thermal design power (TDP) is 100W. Manufactured using 28 nm process technology. G3D Mark benchmark score: 960 points. Launch price was $149.

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Graphics Performance

The GeForce GT 645M scores 945 and the Radeon R7 340 reaches 960 in the G3D Mark benchmark — just a 1.6% difference, making them near-identical in rasterization performance. The GeForce GT 645M is built on Kepler while the Radeon R7 340 uses GCN 1.0, both on a 28 nm process. Shader units: 384 (GeForce GT 645M) vs 1,024 (Radeon R7 340). Raw compute: 0.5445 TFLOPS (GeForce GT 645M) vs 1.997 TFLOPS (Radeon R7 340).

Feature	GeForce GT 645M	Radeon R7 340
G3D Mark Score	945	960+2%
Architecture	Kepler	GCN 1.0
Process Node	28 nm	28 nm
Shading Units	384	1024+167%
Compute (TFLOPS)	0.5445 TFLOPS	1.997 TFLOPS+267%
ROPs	16	32+100%
TMUs	32	64+100%
L1 Cache	32 KB	256 KB+700%
L2 Cache	256 KB	512 KB+100%

✨

Advanced Features (DLSS/FSR)

The GeForce GT 645M gets NVIDIA DLSS, which still tends to look cleaner in motion. The Radeon R7 340 leans on FSR, which is flexible and widely supported, but usually a bit rougher at the same settings.

Feature	GeForce GT 645M	Radeon R7 340
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 R7 340 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 R7 340. L2 Cache: 256 KB (GeForce GT 645M) vs 512 KB (Radeon R7 340) — the Radeon R7 340 has significantly larger on-die cache to reduce VRAM reliance.

Feature	GeForce GT 645M	Radeon R7 340
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	512 KB+100%

🔌

Power & Dimensions

The GeForce GT 645M draws 32W versus the Radeon R7 340's 100W — a 103% difference. The GeForce GT 645M is more power-efficient. Recommended PSU: 350W (GeForce GT 645M) vs 300W (Radeon R7 340). Power connectors: PCIe-powered vs None.

Feature	GeForce GT 645M	Radeon R7 340
TDP	32W-68%	100W
Recommended PSU	350W	300W-14%
Power Connector	PCIe-powered	None
Length	0mm	—
Height	0mm	—
Slots	0	—
Temp (Load)	70°C	—
Perf/Watt	29.5+207%	9.6

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Value Analysis

The newer card here is Radeon R7 340 (2015 vs 2012).

Feature	GeForce GT 645M	Radeon R7 340
MSRP	—	$99
Codename	GK107	Trinidad
Release	October 1 2012	June 18 2015
Ranking	#903	#467

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