Radeon 660M vs Radeon HD 6990M

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 660M vs Radeon HD 6990M 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 660M vs Radeon HD 6990M: 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 660M

2023

Why buy it

✅Better long-term bet: RDNA 2.0 (2020−2025) on 6nm gives it a newer hardware base for upcoming games.
✅Draws 40W instead of 100W, a 60W reduction.
✅More future proof: RDNA 2.0 (2020−2025) on 6nm with a newer platform for upcoming games.

Trade-offs

❌Lower average FPS than Radeon HD 6990M across 50 tracked games in our benchmark data.

Radeon HD 6990M

2011

Why buy it

✅30.1% more average FPS across 50 tracked games in our benchmark data.

Trade-offs

❌2011 hardware with 2 GB of VRAM is already well past its comfortable zone for modern gaming, so it is hard to recommend now.
❌150% higher power demand at 100W vs 40W.

Quick Answers

Which GPU is faster for gaming right now?

Radeon HD 6990M is the faster gaming card right now. In our data, it leads by 30.1% in average FPS across 50 tracked games in our benchmark data and by 1.3% in PassMark G3D (3,264 vs 3,221), so the answer here is pretty clean.

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

Radeon 660M is the safer long-term pick for 2026 and beyond. The case is simple: a 6nm process instead of 40nm, 6 vs 0 ray-tracing units, and a newer 2023 generation instead of 2011. That gives it the more rounded hardware package for newer games.

Which GPU is the better buy today?

Radeon HD 6990M 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 HD 6990M is the easier value choice. If you care more about 1080p and some 1440p headroom, Radeon 660M has the stronger long-term case.

Radeon 660M vs Radeon HD 6990M Technical Specifications

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

Radeon 660M

The Radeon 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: 3,221 points.

Radeon HD 6990M

The Radeon HD 6990M is manufactured by AMD. It was released in July 12 2011. It features the TeraScale 2 architecture. The core clock speed is 715 MHz. It has 1120 shading units. The thermal design power (TDP) is 100W. Manufactured using 40 nm process technology. G3D Mark benchmark score: 3,264 points.

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Graphics Performance

The Radeon 660M scores 3,221 and the Radeon HD 6990M reaches 3,264 in the G3D Mark benchmark — just a 1.3% difference, making them near-identical in rasterization performance. The Radeon 660M is built on RDNA 2.0 while the Radeon HD 6990M uses TeraScale 2, both on 6 nm vs 40 nm. Shader units: 384 (Radeon 660M) vs 1,120 (Radeon HD 6990M). Raw compute: 1.459 TFLOPS (Radeon 660M) vs 1.602 TFLOPS (Radeon HD 6990M).

Feature	Radeon 660M	Radeon HD 6990M
G3D Mark Score	3,221	3,264+1%
Architecture	RDNA 2.0	TeraScale 2
Process Node	6 nm	40 nm
Shading Units	384	1120+192%
Compute (TFLOPS)	1.459 TFLOPS	1.602 TFLOPS+10%
ROPs	16	32+100%
TMUs	24	56+133%
L1 Cache	128 KB	224 KB+75%
L2 Cache	2 MB+300%	0.5 MB
Frame Generation	FSR upscaling + RSR	FSR upscaling

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Advanced Features (DLSS/FSR)

Feature	Radeon 660M	Radeon HD 6990M
Upscaling Tech	FSR Upscaling / FSR 4	FSR Upscaling / FSR 4
Frame Generation	Not Supported	Not Supported
Ray Reconstruction	No	No
Low Latency	AMD Anti-Lag	AMD Anti-Lag

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Video Memory (VRAM)

Both cards ship with 2 GB of Shared. Memory bus width is System on the Radeon 660M and System on the Radeon HD 6990M. L2 Cache: 2 MB (Radeon 660M) vs 0.5 MB (Radeon HD 6990M) — the Radeon 660M has significantly larger on-die cache to reduce VRAM reliance.

Feature	Radeon 660M	Radeon HD 6990M
VRAM Capacity	2 GB	2 GB
Memory Type	Shared	Shared
Memory Bandwidth	System	System
Bus Width	System	System
L2 Cache	2 MB+300%	0.5 MB

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Power & Dimensions

The Radeon 660M draws 40W versus the Radeon HD 6990M's 100W — a 85.7% difference. The Radeon 660M is more power-efficient. Recommended PSU: 350W (Radeon 660M) vs 350W (Radeon HD 6990M). Power connectors: PCIe-powered vs 1x 6-pin.