Under the same specifications, which of the following types of ECS instances has the strongest computing performance?

Question

Options

• AH3. 8xlarge. 4
• BC7. 1arge. 2
• CT6. xlarge. 1
• DS7. large. 2

• A
  75% (27)
• B
  8% (3)
• C
  3% (1)
• D
  14% (5)

Explanation

Option A is correct because the H-series ECS instances (High-performance Computing family) are purpose-built for the most demanding compute workloads, offering dedicated, high-frequency processors with no resource contention, making them the strongest option for raw computing power among the listed families.

Option B (C7) is a compute-optimized instance, which delivers solid performance for CPU-intensive tasks but is designed for general compute workloads rather than peak HPC-level throughput. Option C (T6) belongs to the burstable instance family, meaning it operates at a low baseline CPU performance and only temporarily boosts when credits are available, making it unsuitable for sustained heavy compute. Option D (S7) is a shared-resource instance where CPU and memory are divided among multiple tenants, resulting in the lowest and least predictable performance of all four.

Memory tip: Rank the families by performance using the phrase "H beats C beats T and S" -- H (High-performance) sits at the top, C (Compute-optimized) is mid-tier, while T (burstable) and S (shared) sit at the bottom because both sacrifice sustained compute power for lower cost.

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