what OS is best for mining XPM on this servers?
and EC2 is the best one i guess ?
M1, C1, M2 and HI1 instances are based on Intel Xeon processors.
For M3, CC2 and CR1 instances, each vCPU is a hardware hyperthread from Intel Xeon E5-2670 processors.
For HS1 instances, each vCPU is a hardware hyperthread from Intel Xeon E5-2650 processors.
CG1 instances are backed by 2 x Intel Xeon X5570, quad-core with hyperthread plus 2 NVIDIA Tesla M2050 GPUs.
HI1 instances can deliver more than 120,000 4 KB random read IOPS, and between 10,000 and 85,000 4 KB random write IOPS (depending on active logical block addressing span) to applications. The maximum sequential throughput is approximately 2 GB/s read and 1.1 GB/s write.
HS1 instances can deliver 2.4 GB/s of 2 MB sequential read performance, and 2.6 GB/s of sequential write performance.
Each I2 virtual CPU (vCPU) is a hardware hyperthread from an Intel Xeon E5-2670 v2 (Ivy Bridge) processor
whats best for primecoin ?
