Radeon HD 6990 vs Radeon Pro 555X

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 HD 6990 vs Radeon Pro 555X 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 HD 6990 vs Radeon Pro 555X: 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 HD 6990

2011

Why buy it

✅44.3% more average FPS across 50 tracked games in our benchmark data.
✅Delivers 100+% more G3D Mark for each dollar spent, at 4.3 vs 0 G3D/$ ($699 MSRP vs Unknown MSRP).

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.
❌400% higher power demand at 375W vs 75W.

Radeon Pro 555X

2018

Why buy it

✅Radeon HD 6990 is already obsolete for modern gaming, so Radeon Pro 555X is the less risky modern option long term.
✅Draws 75W instead of 375W, a 300W reduction.
✅More future proof: GCN 4.0 (2016−2020) on 14nm with a newer platform for upcoming games.

Trade-offs

❌Lower average FPS than Radeon HD 6990 across 50 tracked games in our benchmark data.
❌2018 hardware with 2 GB of VRAM already sits in legacy territory for modern games.
❌Lower G3D Mark per dollar, at 0 vs 4.3 G3D/$ (Unknown MSRP vs $699 MSRP).

Quick Answers

Which GPU is faster for gaming right now?

Radeon HD 6990 is the faster gaming card right now. In our data, it leads by 44.3% in average FPS across 50 tracked games in our benchmark data and by 0.5% in PassMark G3D (3,014 vs 3,000), so the answer here is pretty clean.

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

Radeon Pro 555X is the safer long-term pick for 2026 and beyond. The case is simple: a 14nm process instead of 40nm and a newer 2018 generation instead of 2011. That makes it the less risky pick as game demands keep moving.

Which GPU is the better buy today?

Radeon HD 6990 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 6990 is the easier value choice. If you care more about 1080p and some 1440p headroom, Radeon Pro 555X has the stronger long-term case.

Radeon HD 6990 vs Radeon Pro 555X Technical Specifications

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

Radeon HD 6990

The Radeon HD 6990 is manufactured by AMD. It was released in March 8 2011. It features the TeraScale 3 architecture. The core clock speed is 830 MHz. It has 1536 ×2 shading units. The thermal design power (TDP) is 375W. Manufactured using 40 nm process technology. G3D Mark benchmark score: 3,014 points. Launch price was $699.

Radeon Pro 555X

The Radeon Pro 555X is manufactured by AMD. It was released in July 16 2018. It features the GCN 4.0 architecture. The core clock speed is 907 MHz. It has 768 shading units. The thermal design power (TDP) is 75W. Manufactured using 14 nm process technology. G3D Mark benchmark score: 3,000 points.

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Graphics Performance

The Radeon HD 6990 scores 3,014 and the Radeon Pro 555X reaches 3,000 in the G3D Mark benchmark — just a 0.5% difference, making them near-identical in rasterization performance. The Radeon HD 6990 is built on TeraScale 3 while the Radeon Pro 555X uses GCN 4.0, both on 40 nm vs 14 nm. Shader units: 1,536 (Radeon HD 6990) vs 768 (Radeon Pro 555X). Raw compute: 2.55 TFLOPS ×2 (Radeon HD 6990) vs 1.393 TFLOPS (Radeon Pro 555X).

Feature	Radeon HD 6990	Radeon Pro 555X
G3D Mark Score	3,014	3,000
Architecture	TeraScale 3	GCN 4.0
Process Node	40 nm	14 nm
Shading Units	1536 ×2+100%	768
Compute (TFLOPS)	2.55 TFLOPS ×2+83%	1.393 TFLOPS
ROPs	32 ×2+100%	16
TMUs	96 ×2+100%	48
L1 Cache	384 KB+100%	192 KB
L2 Cache	0.5 MB	1 MB+100%
Frame Generation	FSR upscaling	FSR upscaling

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Advanced Features (DLSS/FSR)

Feature	Radeon HD 6990	Radeon Pro 555X
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 GDDR5. Memory bus width is 128-bit on the Radeon HD 6990 and 64-bit on the Radeon Pro 555X. L2 Cache: 0.5 MB (Radeon HD 6990) vs 1 MB (Radeon Pro 555X) — the Radeon Pro 555X has significantly larger on-die cache to reduce VRAM reliance.

Feature	Radeon HD 6990	Radeon Pro 555X
VRAM Capacity	2 GB	2 GB
Memory Type	GDDR5	GDDR5
Bus Width	128-bit+100%	64-bit
L2 Cache	0.5 MB	1 MB+100%

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Power & Dimensions

The Radeon HD 6990 draws 375W versus the Radeon Pro 555X's 75W — a 133.3% difference. The Radeon Pro 555X is more power-efficient. Recommended PSU: 750W (Radeon HD 6990) vs 350W (Radeon Pro 555X). Power connectors: 2x 8-pin vs PCIe-powered.

Feature	Radeon HD 6990	Radeon Pro 555X
TDP	375W	75W-80%
Recommended PSU	750W	350W-53%
Power Connector	2x 8-pin	PCIe-powered
Length	310mm	—
Height	115mm	—
Slots	2	—
Temp (Load)	85	—
Perf/Watt	8.0	40.0+400%

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Value Analysis

At launch, the Radeon HD 6990 came in at $699, while the Radeon Pro 555X launched at $0. On MSRP, Radeon Pro 555X was 100+% cheaper ($699 less). Performance per dollar on MSRP (G3D Mark / MSRP): 4.3 (Radeon HD 6990) vs Infinity (Radeon Pro 555X) — the Radeon Pro 555X offers Infinity% better value. The newer card here is Radeon Pro 555X (2018 vs 2011).

Feature	Radeon HD 6990	Radeon Pro 555X
MSRP	$699	$0-100%
Performance per Dollar	4.3	Infinity
Codename	Antilles	Polaris 21
Release	March 8 2011	July 16 2018
Ranking	#583	#564

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