CPU
GPU
Radeon HD 6990
Popular choices:
Radeon Pro 555X
Popular choices:
Performance Spectrum - GPU
About G3D Mark
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.
Value Upgrade Path
This is the official ChipVERSUS Value Rating, comparing raw performance (G3D Mark) per dollar. Components placed above yours deliver better value for money.
Avg price is the current average price collected from markets across the web.
Performance Per Dollar
Performance Per Dollar
Performance Comparison
About G3D Mark🏆 Chipversus Verdict
⚠️ Generational Difference
The Radeon Pro 555X is significantly newer (2018 vs 2011). The Radeon Pro 555X likely supports modern features like Ray Tracing, Tensor Cores, and DLSS/FSR upscaling, which act as force multipliers for performance. The Radeon HD 6990 lacks this hardware feature set, limiting its longevity in modern titles despite any raw power similarities.
🚀 Performance Leadership
The Radeon HD 6990 is the superior choice for raw performance. It leads with a 0.5% higher G3D Mark score. This advantage makes it significantly better for higher resolutions (1440p/4K) and graphic-intensive titles compared to the Radeon Pro 555X.
| Insight | Radeon HD 6990 | Radeon Pro 555X |
|---|---|---|
| Performance | ✅Leading raw performance (+0.5%) | ❌Lower raw frame rates (-0.5%) |
| Longevity | 🛑Obsolete Architecture (2011 / TeraScale 3 (2010−2013)) | 🛑Obsolete Architecture (2018 / GCN 4.0 (2016−2020)) |
| Ecosystem | Supports FSR Upscaling | Supports FSR Upscaling |
| VRAM | ❌ Less VRAM capacity | ✅ More VRAM (+0%) |
| Efficiency | ⚡ Higher Power Consumption | 💡 Excellent Perf/Watt |
| Case Fit | Standard Size (310mm) | — |
💎 Value Proposition
The Radeon HD 6990 offers a compelling cost-to-performance ratio. Priced at $498 versus $1,049 for the Radeon Pro 555X, it costs 53% less. While it maintains basic entry-level capabilities, this results in a 111.6% higher cost efficiency score.
| Insight | Radeon HD 6990 | Radeon Pro 555X |
|---|---|---|
| Cost Efficiency | ✅Better overall value (+111.6%) | ❌Lower cost efficiency |
| Upfront Cost | ✅More affordable ($498) | ⚠️Higher upfront cost ($1,049) |
Performance Check
Real-world benchmarks and performance projections based on comprehensive hardware analysis and comparative metrics. Values represent expected performance on High/Ultra settings at 1080p, 1440p, and 4K. Modeled using a Ryzen 7 7800X3D reference profile to minimize specific CPU bottlenecks.
Note: Performance behavior can vary per game. Specific architectures may perform better or worse depending on game engine optimizations and API implementation.
Technical Specifications
Side-by-side comparison of Radeon HD 6990 and Radeon Pro 555X
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.
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% |
Advanced Features (DLSS/FSR)
| Feature | Radeon HD 6990 | Radeon Pro 555X |
|---|---|---|
| Upscaling Tech | FSR 1.0 (Software) | FSR 1.0 (Software) |
| Frame Generation | Not Supported | Not Supported |
| Ray Reconstruction | No | No |
| Low Latency | AMD Anti-Lag | AMD Anti-Lag |
Video Memory (VRAM)
Both cards feature 2 GB of GDDR5. Bus width: 128-bit vs 64-bit. 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% |
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% |
Value Analysis
The Radeon HD 6990 launched at $699 MSRP and currently averages $498, while the Radeon Pro 555X launched at $0 and now averages $1049. The Radeon HD 6990 costs 52.5% less ($551 savings) at current market prices. Performance per dollar (G3D Mark / price): 6.1 (Radeon HD 6990) vs 2.9 (Radeon Pro 555X) — the Radeon HD 6990 offers 110.3% better value. The Radeon Pro 555X is the newer GPU (2018 vs 2011).
| Feature | Radeon HD 6990 | Radeon Pro 555X |
|---|---|---|
| MSRP | $699 | $0-100% |
| Avg Price (30d) | $498-53% | $1049 |
| Performance per Dollar | 6.1+110% | 2.9 |
| Codename | Antilles | Polaris 21 |
| Release | March 8 2011 | July 16 2018 |
| Ranking | #583 | #564 |
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