Vps – Why is the bare-metal 16x 2.93GHz cores computer performing poorer than a VPS with 4x 2.5GHz cores

I have a written a piece of multi-threaded software that does a bunch of simulations a day. This is a very CPU-intensive task, and I have been running this program on cloud services, usually on configurations like 1GB per core.

I am running CentOS 6.7, and /proc/cpuinfo gives me that my four VPS cores are 2.5GHz.

processor       : 3
vendor_id       : GenuineIntel
cpu family      : 6
model           : 63
model name      : Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz
stepping        : 2
microcode       : 1
cpu MHz         : 2499.992
cache size      : 30720 KB
physical id     : 3
siblings        : 1
core id         : 0
cpu cores       : 1
apicid          : 3
initial apicid  : 3
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ss syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon rep_good unfair_spinlock pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm arat xsaveopt fsgsbase bmi1 avx2 smep bmi2 erms invpcid
bogomips        : 4999.98
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

With a rise of exchange rates, my VPS started to be more expensive, and I have came to a "great deal" on used bare-metal servers.

I purchased four HP DL580 G5, with four Intel Xeon X7350s each.
Basically, each machine has 16x 2.93GHz cores and 16GB, to keep things like my VPS cloud.

processor       : 15
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU           X7350 @ 2.93GHz
stepping        : 11
microcode       : 187
cpu MHz         : 1600.002
cache size      : 4096 KB
physical id     : 6
siblings        : 4
core id         : 3
cpu cores       : 4
apicid          : 27
initial apicid  : 27
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca lahf_lm dts tpr_shadow vnmi flexpriority
bogomips        : 5866.96
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

Essentially it seemed a great deal, as I could stop using VPS's to perform these batch works. Now it is the weird stuff…

1. On the VPS's I have been running 1.25 thread per core, just like I have been doing on the bare metal. (The extra 0.25 thread is to compensate idle time caused by network use.)
2. On my VPS, using in total 44x 2.5GHz cores, I get nearly 900 simulations per minute.
3. On my DL580, using in total 64x 2.93GHz cores, I am only getting 300 simulations per minute.

I understand the DL580 has an older processor. But if I am running one thread per core, and the bare metal server has a faster core, why is it performing poorer than my VPS?

I have no memory swap happening in any of the servers.

TOP says my processors are running at 100%. I get an average load of 18 (5 on VPS).

Is this going to be this way, or am I missing something?

Running lscpu gives me 1.6GHz on my bare metal server. This was seen on the /proc/cpuinfo as well.

Is this information correct, or is it linked to some incorrect power management?

[BARE METAL] $ lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                16
On-line CPU(s) list:   0-15
Thread(s) per core:    1
Core(s) per socket:    4
Socket(s):             4
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 15
Stepping:              11
**CPU MHz:               1600.002**
BogoMIPS:              5984.30
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              4096K
NUMA node0 CPU(s):     0-15


[VPS] $ lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                4
On-line CPU(s) list:   0-3
Thread(s) per core:    1
Core(s) per socket:    1
Socket(s):             4
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 63
Stepping:              2
**CPU MHz:               2499.992**
BogoMIPS:              4999.98
Hypervisor vendor:     KVM
Virtualization type:   full
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              30720K
NUMA node0 CPU(s):     0-3