Today Amazon has added Windows support for their biggest instance types – Cluster Compute and Cluster GPU - see AWS Blog. These are the most powerful instances available in Amazon EC2, providing 8 Xeon Nehalem cores and 23 GB RAM, 10 Gigabit Ethernet and NVIDIA Tesla for the GPU instance. These instances weren’t so far available with Windows, what was limiting Amazon’s offer for CPU intensive applications running on Windows. Now the gap was closed. Obviously Cloudorado is already reflecting the change.