CPU compatible doubt

Hello I have 3 ESX Servers in a cluster with HA & DRS working fine and with the CPU configuration below:

Server 1 & 2 (DELL PE 2950)

-

vendor_id       : GenuineIntel

cpu family      : 15

model           : 6

model name      : Intel(R) Xeon(TM) CPU 3.00GHz

stepping        : 4

cpuid level     : 6

Server 3 (DELL PE 2850)

-

vendor_id       : GenuineIntel

cpu family      : 15

model           : 4

model name      : Intel(R) Xeon(TM) CPU 3.20GHz

stepping        : 1

cpuid level     : 5

Now  I am willing to procure another DELL PE 2950 but after reviewing the CPU configuration I am not sure if these CPU's will work with my actual environment, DELL now change its models to X, E and L (something) :

The one in bold is the one I choose but not sure if it will work or even though if any of them should work with my environment,

<![endif]><![if gte mso 9]>Quad Core Intel® Xeon®X5460, 2x6MB Cache, 3.16GHz, 1333MHz FSB

Quad Core Intel® Xeon® E5440, 2x6MB Cache, 2.83GHz, 1333MHz FSB

Quad Core Intel® Xeon® E5430, 2x6MB Cache, 2.66GHz, 1333MHz FSB

Quad Core Intel® Xeon® E5420, 2x6MB Cache, 2.5GHz, 1333MHz FSB

Quad Core Intel® Xeon® E5410, 2x6MB Cache, 2.33GHz, 1333MHz FSB

Quad Core Intel® Xeon® E5405, 2x6MB Cache, 2.0GHz, 1333MHz FSB

Quad Core Intel® Xeon®X5450, 2x6MB Cache, 3.0GHz, 1333MHz FSB

Dual Core Intel® Xeon® E5205, 6MB Cache, 1.86GHz, 1066MHz FSB

Dual Core Intel® Xeon® X5260, 6MB Cache, 3.33GHz, 1333MHz FSB

Quad Core Intel® Xeon® L5410, 2x6MB Cache, 2.33GHz, 1333MHz FSB

+*_Dual

Core Intel® Xeon® L5240, 6MB Cache, 3.0GHz, 1333MHz FSB_*+

Quad Core Intel® Xeon® X5470, 2X6MB Cache, 3.33GHz, 1333MHz FSB

Quad Core Intel® Xeon® L5430, 2X6MB Cache, 2.6GHz, 1333MHz FSB

Dual Core Intel® Xeon® X5270, 6MB Cache, 3.5GHz, 1333MHz FSB