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Wrong part number/slow memory bandwidth


triumphtotty

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Hi,

 

I bought two 2GB DDR3-1333 RAM sticks, Corsair kit CMV4GX3M2A1333C9 a few weeks ago for a new system. Running SiSoft Sandra, I noticed the memory bandwidth on my system seemed poor compared to comparable systems. I ran CPU-z and noticed that the RAM part numbers are totally different (I'll paste CPU-z RAM bit after this post). One is CM3X2G1333C9 and the other is VS2GB1333D3.

 

Although these RAM chips are similar, and the JEDEC info is identical, the SPD registers are slightly different. Should the kit I ordered have had identical modules in it to start with? Could the different RAM affect the memory bandwidth, if they're not running properly in Dual Channel mode, or should the different parts be OK together?

 

Thanks,

 

Andrew

 

 

Memory SPD

-------------------------------------------------------------------------

DIMM # 1

SMBus address 0x50

Memory type DDR3

Module format UDIMM

Manufacturer (ID) Corsair (7F7F9E0000000000)

Size 2048 MBytes

Max bandwidth PC3-10700H (667 MHz)

Part number CM3X2G1333C9

Manufacturing date Week 06/Year 10

Number of banks 8

Nominal Voltage 1.50 Volts

EPP no

XMP no

JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency

JEDEC #1 6.0-6-6-16-23 @ 444 MHz

JEDEC #2 7.0-7-7-19-27 @ 518 MHz

JEDEC #3 8.0-8-8-22-30 @ 592 MHz

JEDEC #4 9.0-9-9-24-34 @ 666 MHz

 

DIMM # 2

SMBus address 0x52

Memory type DDR3

Module format UDIMM

Manufacturer (ID) Corsair (7F7F9E0000000000)

Size 2048 MBytes

Max bandwidth PC3-10700H (667 MHz)

Part number VS2GB1333D3

Number of banks 8

Nominal Voltage 1.50 Volts

EPP no

XMP no

JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency

JEDEC #1 6.0-6-6-16-23 @ 444 MHz

JEDEC #2 7.0-7-7-19-27 @ 518 MHz

JEDEC #3 8.0-8-8-22-30 @ 592 MHz

JEDEC #4 9.0-9-9-24-34 @ 666 MHz

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Thanks for the reply. I had to flash my BIOS last week to get AHCI working on HD, and that seems to have changed some settings (my i3 was only running at 2GHz, as the multiplier was down at 15X!). I'll triple-check the memory timing settings in the BIOS and recheck the memory bandwidth.
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