selecting proper RAM for a HP xw4600 Workstation

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My machine configuration follows

        System Properties:
            Manufacturer      Hewlett-Packard
            Product      HP xw4600 Workstation

                BIOS Properties:
            Vendor      Hewlett-Packard
            Version      786F3 v01.06
            Release Date      01/29/2008
            Size      4096 KB
            Boot Devices      Floppy Disk, Hard Disk, CD-ROM, ATAPI ZIP, LS-120
            Capabilities      Flash BIOS, Shadow BIOS, Selectable Boot, EDD, BBS
            Supported Standards      DMI, ACPI, PnP
            Expansion Capabilities      PCI, USB

                    Motherboard Properties:
            Manufacturer      Hewlett-Packard
            Product      0AA0h

                    Processor Properties:
            Manufacturer      Intel
            Version      Intel(R) Core(TM)2 Duo CPU E6550 @ 2.33GHz
            External Clock      1333 MHz
            Maximum Clock      6000 MHz
            Current Clock      2333 MHz
            Type      Central Processor
            Voltage      1.2 V
            Status      Enabled
            Socket Designation      XU1 PROCESSOR

                    Memory Device Properties:
            Form Factor      DIMM
            Type Detail      Synchronous
            Size      1024 MB
            Speed      667 MHz
            Total Width      72-bit
            Data Width      64-bit
            Device Locator      XMM1
            Manufacturer      JEDEC ID:CE 00 00 00 00 00 00 00
            Serial Number      07082C83
            Part Number      M3 91T2953EZ3-CE6

                    Memory Device Properties:
            Form Factor      DIMM
            Type Detail      Synchronous
            Size      1024 MB
            Speed      667 MHz
            Total Width      72-bit
            Data Width      64-bit
            Device Locator      XMM3
            Manufacturer      JEDEC ID:CE 00 00 00 00 00 00 00
            Serial Number      0B082C83
            Part Number      M3 91T2953EZ3-CE6

Northbridge    Intel X38 rev. 00
Southbridge    Intel 82801IR (ICH9R) rev. 02
Graphic Interface    PCI-Express
PCI-E Link Width    x16
PCI-E Max Link Width    x16
Memory Type    DDR2
Memory Size    2048 MBytes
Channels    Dual, (Symmetric)
Memory Frequency    333.4 MHz (1:1)
CAS# latency (CL)    5.0
RAS# to CAS# delay (tRCD)    5
RAS# Precharge (tRP)    5
Cycle Time (tRAS)    15
Row Refresh Cycle Time (tRFC)    36
Command Rate (CR)    2T

I guess it should take the RAM at


( product link shortened)

but not sure.

Can someone please clarify if both RAM's will work for my system?
Because if so, I would want to get the RAM from which
lot cheaper than crucial.

Also, if someone could explain the reason for
variation of prices between the two. Is it because of quality,
different brands or
some other reason(like crucial has longer warranty than HP)

Thanks a lot.

Re: selecting proper RAM for a HP xw4600 Workstation

g_1 wrote:
Quoted text here. Click to load it
( product link shortened)
Quoted text here. Click to load it

Doesn't the "total width" of 72 bits, imply the current memory
is unbuffered ECC memory ? The Crucial FAQ items mentions not mixing
ECC and non-ECC memory. If you use non-ECC memory, then ECC protection
would have to be disabled. The entries listed in the Crucial page, all
seem to have ECC, so the "system scanner" picked up on that

For the item on Amazon, the HP part number is AH058AT. If I look
that up on another site, it is listed as "unbuffered - non-ECC" and
thus doesn't match the current contents of your computer. Your X38
chipset is ECC capable, and it looks like the original RAM was ECC,
based on your XMM1/XMM3 info.

You don't have to buy from Crucial, but you do have to locate
something with ECC on it. That would be my suggestion. If you
look at your current modules, you should see something like nine
identical memory chips on each side of the module. Eight memory chips
is non-ECC while nine memory chips is ECC (in both cases I'm referring to
unbuffered modules). Registered modules have additional chips, but
generally the additional chips are a different size than the memory
chips. And we're not even talking about registered modules in this
case anyway.

The memory types, roughly speaking are:

1) unbuffered non-ECC (typical desktop memory, no protection from errors)
2) unbuffered ECC     (a desktop/workstation memory, with protection from errors)
3) registered ECC     (server memory, protection from errors, buffering allows
                        the number of modules to sit on the bus, handy for
higher total
                        memory configurations, or the use of quad bank modules)


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