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Very very nice: 34.2 GB RAM and 68.4 GB RAM instances on EC2

# free -m
             total       used       free     shared    buffers     cached
Mem:         70007       2205      67801          0         28        595
-/+ buffers/cache:       1581      68425
Swap:            0          0          0

# cat /proc/cpuinfo
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 26
model name	: Intel(R) Xeon(R) CPU           X5550  @ 2.67GHz
stepping	: 5
cpu MHz		: 2666.760
cache size	: 8192 KB
physical id	: 0
siblings	: 1
core id		: 0
cpu cores	: 1
fpu		: yes
fpu_exception	: yes
cpuid level	: 11
wp		: yes
flags		: fpu tsc msr pae mce cx8 apic mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr dca popcnt lahf_lm
bogomips	: 5336.34
clflush size	: 64
cache_alignment	: 64
address sizes	: 40 bits physical, 48 bits virtual
power management:

[..]

We just included support for those machines in Scalarium, our EC2 cluster management plattform.