RAM for Dell Precision T7500

Hi, I currently have a dell precision T7500 with 4x1GB RAM installed (2 on DIMM and 2 on RISER). I am looking to upgrade this to 4x4GB or 4X8GB with sticks installed in the same slots. A direct link to a compatible memory either in Amazon or Tigerdirect is deeply appreciated.

The Output from CPUZ-ID gives me:

Processors Information
-------------------------------------------------------------------------

Processor 1 ID = 1
Number of cores 4 (max 8)
Number of threads 4 (max 16)
Name Intel Xeon E5504
Codename Gainestown
Specification Intel(R) Xeon(R) CPU E5504 @ 2.00GHz
Package (platform ID) Socket 1366 LGA (0x0)
CPUID 6.A.5
Extended CPUID 6.1A
Core Stepping D0
Technology 45 nm
TDP Limit 80.0 Watts
Core Speed 1992.0 MHz
Multiplier x Bus Speed 15.0 x 132.8 MHz
Rated Bus speed 2390.4 MHz
Stock frequency 2000 MHz
Instructions sets MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, EM64T, VT-x
L1 Data cache 4 x 32 KBytes, 8-way set associative, 64-byte line size
L1 Instruction cache 4 x 32 KBytes, 4-way set associative, 64-byte line size
L2 cache 4 x 256 KBytes, 8-way set associative, 64-byte line size
L3 cache 4 MBytes, 16-way set associative, 64-byte line size
FID/VID Control yes


Turbo Mode not supported
Max turbo frequency 2000 MHz
Max non-turbo ratio 15x
Max turbo ratio 15x
Max efficiency ratio 12x
TDC Limit 70 Amps
Max bus number 255
Attached device PCI device at bus 254, device 2, function 0
Attached device PCI device at bus 254, device 3, function 4

Processor 2 ID = 0
Number of cores 4 (max 8)
Number of threads 4 (max 16)
Name Intel Xeon E5504
Codename Gainestown
Specification Intel(R) Xeon(R) CPU E5504 @ 2.00GHz
Package (platform ID) Socket 1366 LGA (0x0)
CPUID 6.A.5
Extended CPUID 6.1A
Core Stepping D0
Technology 45 nm
TDP Limit 80.0 Watts
Core Speed 1992.0 MHz
Multiplier x Bus Speed 15.0 x 132.8 MHz
Rated Bus speed 2390.4 MHz
Stock frequency 2000 MHz
Instructions sets MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, EM64T, VT-x
L1 Data cache 4 x 32 KBytes, 8-way set associative, 64-byte line size
L1 Instruction cache 4 x 32 KBytes, 4-way set associative, 64-byte line size
L2 cache 4 x 256 KBytes, 8-way set associative, 64-byte line size
L3 cache 4 MBytes, 16-way set associative, 64-byte line size
FID/VID Control yes


Turbo Mode not supported
Max turbo frequency 2000 MHz
Max non-turbo ratio 15x
Max turbo ratio 15x
Max efficiency ratio 12x
TDC Limit 70 Amps
Max bus number 255
Attached device PCI device at bus 255, device 2, function 0
Attached device PCI device at bus 255, device 3, function 4

Chipset
-------------------------------------------------------------------------

Northbridge Intel 5520 rev. 13
Southbridge Intel 82801JR (ICH10R) rev. 00
Graphic Interface PCI-Express
PCI-E Link Width x16
PCI-E Max Link Width x16
Memory Type DDR3
Memory Size 4094 MBytes
Channels Dual
Memory Frequency 398.4 MHz (2:6)
CAS# latency (CL) 6.0
RAS# to CAS# delay (tRCD) 6
RAS# Precharge (tRP) 6
Cycle Time (tRAS) 15
Row Refresh Cycle Time (tRFC) 44
Command Rate (CR) 1T
Uncore Frequency 1593.6 MHz

Memory SPD
-------------------------------------------------------------------------

DMI Physical Memory Array
location Motherboard
usage System Memory
correction Multi-bit ECC
max capacity 196608 MBytes
max# of devices 12

DMI Memory Device
designation DIMM 1
format DIMM
type unknown
total width 72 bits
data width 64 bits
size 1024 MBytes

DMI Memory Device
designation DIMM 2
format DIMM
type unknown
total width 72 bits
data width 64 bits
size 1024 MBytes

DMI Memory Device
designation DIMM 3
format DIMM
type unknown
total width 72 bits
data width 64 bits

DMI Memory Device
designation DIMM 4
format DIMM
type unknown
total width 72 bits
data width 64 bits

DMI Memory Device
designation DIMM 5
format DIMM
type unknown
total width 72 bits
data width 64 bits

DMI Memory Device
designation DIMM 6
format DIMM
type unknown
total width 72 bits
data width 64 bits

DMI Memory Device
designation RISER DIMM 1
format DIMM
type unknown
total width 72 bits
data width 64 bits
size 1024 MBytes

DMI Memory Device
designation RISER DIMM 2
format DIMM
type unknown
total width 72 bits
data width 64 bits
size 1024 MBytes

DMI Memory Device
designation RISER DIMM 3
format DIMM
type unknown
total width 72 bits
data width 64 bits

DMI Memory Device
designation RISER DIMM 4
format DIMM
type unknown
total width 72 bits
data width 64 bits

DMI Memory Device
designation RISER DIMM 5
format DIMM
type unknown
total width 72 bits
data width 64 bits

DMI Memory Device
designation RISER DIMM 6
format DIMM
type unknown
total width 72 bits
data width 64 bits



Thanks,

Regards,

Virendra.