Radeon RX 640 vs RadeonT 660M

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.

Radeon RX 640 vs RadeonT 660M 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.

Radeon RX 640 vs RadeonT 660M: Pros, Cons & Final Verdict

See where each GPU makes more sense in practice: raw FPS, VRAM, features, power draw, pricing, and long-term headroom.

Radeon RX 640

2019

Why buy it

✅Delivers 100+% more G3D Mark for each dollar spent, at 13.7 vs 0 G3D/$ ($159 MSRP vs Unknown MSRP).
✅Access to a newer frame-generation stack with FSR Frame Generation + AFMF (2023).
✅100% more VRAM for high-resolution textures and newer games (4 GB vs 2 GB).

Trade-offs

❌Lower average FPS than RadeonT 660M across 50 tracked games in our benchmark data.
❌Older hardware, 4 GB of VRAM, and weaker feature support mean it will age faster in newer AAA releases.
❌25% higher power demand at 50W vs 40W.

RadeonT 660M

2023

Why buy it

✅2.7% more average FPS across 50 tracked games in our benchmark data.
✅Better long-term bet: RDNA 2.0 (2020−2025) on 6nm gives it a newer hardware base for upcoming games.
✅Draws 40W instead of 50W, a 10W reduction.

Trade-offs

❌Less VRAM, with 2 GB vs 4 GB for high-resolution textures and newer games.
❌No equivalent frame-generation stack like FSR Frame Generation + AFMF (2023).
❌Lower G3D Mark per dollar, at 0 vs 13.7 G3D/$ (Unknown MSRP vs $159 MSRP).

Quick Answers

Which GPU is faster for gaming right now?

RadeonT 660M is the faster gaming card right now. In our data, it leads by 2.7% in average FPS across 50 tracked games in our benchmark data and by 2.3% in PassMark G3D (2,221 vs 2,172), so the answer here is pretty clean.

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

RadeonT 660M 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 FSR 3 (2023), a 6nm process instead of 14nm, 6 vs 0 ray-tracing units, and a newer 2023 generation instead of 2019. That gives it the more rounded hardware package for newer games.

Which GPU is the better buy today?

Radeon RX 640 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 RX 640 is the easier value choice. If you care more about 1080p and some 1440p headroom, RadeonT 660M has the stronger long-term case.

Radeon RX 640 vs RadeonT 660M Technical Specifications

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

Radeon RX 640

The Radeon RX 640 is manufactured by AMD. It was released in May 13 2019. It features the GCN 4.0 architecture. The core clock ranges from 1082 MHz to 1218 MHz. It has 640 shading units. The thermal design power (TDP) is 50W. Manufactured using 14 nm process technology. G3D Mark benchmark score: 2,172 points.

RadeonT 660M

The RadeonT 660M is manufactured by AMD. It was released in January 3 2023. It features the RDNA 2.0 architecture. The core clock ranges from 1500 MHz to 1900 MHz. It has 384 shading units. The thermal design power (TDP) is 40W. Manufactured using 6 nm process technology. It features 6 dedicated ray tracing cores for enhanced lighting effects. G3D Mark benchmark score: 2,221 points.

⚡

Graphics Performance

The Radeon RX 640 scores 2,172 and the RadeonT 660M reaches 2,221 in the G3D Mark benchmark — just a 2.3% difference, making them near-identical in rasterization performance. The Radeon RX 640 is built on GCN 4.0 while the RadeonT 660M uses RDNA 2.0, both on 14 nm vs 6 nm. Shader units: 640 (Radeon RX 640) vs 384 (RadeonT 660M). Raw compute: 1.559 TFLOPS (Radeon RX 640) vs 1.459 TFLOPS (RadeonT 660M). Boost clocks: 1218 MHz vs 1900 MHz.

Feature	Radeon RX 640	RadeonT 660M
G3D Mark Score	2,172	2,221+2%
Architecture	GCN 4.0	RDNA 2.0
Process Node	14 nm	6 nm
Shading Units	640+67%	384
Compute (TFLOPS)	1.559 TFLOPS+7%	1.459 TFLOPS
Boost Clock	1218 MHz	1900 MHz+56%
ROPs	16	16
TMUs	40+67%	24
L1 Cache	160 KB+25%	128 KB
L2 Cache	0.5 MB	2 MB+300%
Frame Generation	FSR 3 + AFMF	FSR upscaling + RSR

✨

Advanced Features (DLSS/FSR)

The clearest feature edge for the Radeon RX 640 is support for FSR Frame Generation + AFMF. In games that support it, that can smooth out motion and lift perceived FPS. The RadeonT 660M does not have comparable native support in the same tier.

Feature	Radeon RX 640	RadeonT 660M
Upscaling Tech	FSR 3	FSR Upscaling / FSR 4
Frame Generation	FSR Frame Generation + AFMF	Not Supported
Ray Reconstruction	No	No
Low Latency	AMD Anti-Lag	AMD Anti-Lag

💾

Video Memory (VRAM)

The Radeon RX 640 has 4 GB of VRAM, while the RadeonT 660M carries 2 GB. Radeon RX 640 gives you 100% more memory capacity, which matters more once you move into heavier textures, mods, or higher resolutions. Memory bus width is 128-bit on the Radeon RX 640 and 64-bit on the RadeonT 660M. L2 Cache: 0.5 MB (Radeon RX 640) vs 2 MB (RadeonT 660M) — the RadeonT 660M has significantly larger on-die cache to reduce VRAM reliance.

Feature	Radeon RX 640	RadeonT 660M
VRAM Capacity	4 GB+100%	2 GB
Memory Type	GDDR5	GDDR5
Bus Width	128-bit+100%	64-bit
L2 Cache	0.5 MB	2 MB+300%

🖥️

Display & API Support

DirectX support: 12 (FL 12_0) (Radeon RX 640) vs 12 (12_2) (RadeonT 660M). Vulkan: 1.3 vs 1.3. OpenGL: 4.6 vs 4.6. Maximum simultaneous displays: 6 vs 3.

Feature	Radeon RX 640	RadeonT 660M
DirectX	12 (FL 12_0)	12 (12_2)
Vulkan	1.3	1.3
OpenGL	4.6	4.6
Max Displays	6+100%	3

🎬

Media & Encoding

Hardware encoder: VCE 3.4 (Radeon RX 640) vs VCN 3.0 (RadeonT 660M). Decoder: UVD 6.3 vs VCN 3.0. Supported codecs: H.264,H.265/HEVC (Radeon RX 640) vs H.264,H.265,VP9,AV1,JPEG (RadeonT 660M).

Feature	Radeon RX 640	RadeonT 660M
Encoder	VCE 3.4	VCN 3.0
Decoder	UVD 6.3	VCN 3.0
Codecs	H.264,H.265/HEVC	H.264,H.265,VP9,AV1,JPEG

🔌

Power & Dimensions

The Radeon RX 640 draws 50W versus the RadeonT 660M's 40W — a 22.2% difference. The RadeonT 660M is more power-efficient. Recommended PSU: 350W (Radeon RX 640) vs 350W (RadeonT 660M). Power connectors: PCIe-powered vs PCIe-powered.

Feature	Radeon RX 640	RadeonT 660M
TDP	50W	40W-20%
Recommended PSU	350W	350W
Power Connector	PCIe-powered	PCIe-powered
Slots	1	—
Perf/Watt	43.4	55.5+28%

💰

Value Analysis

The newer card here is RadeonT 660M (2023 vs 2019).

Feature	Radeon RX 640	RadeonT 660M
MSRP	$159	—
Codename	Polaris 23	Rembrandt+
Release	May 13 2019	January 3 2023
Ranking	#665	#565

Search Radeon RX 640 on Amazon

Search RadeonT 660M on Amazon

Affiliate Disclosure

ChipVERSUS is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. We may earn a commission on qualifying purchases made through our links. This comes at no additional cost to you and helps support our work in providing comprehensive PC building guides and tools.

Amazon and the Amazon logo are trademarks of Amazon.com, Inc. or its affiliates.