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Windows 7: Dual quad core only recognizing single xeon-- help!

17 Mar 2012   #1

Windows 7 Professional 64-bit
Dual quad core only recognizing single xeon-- help!


I've seen this posted on a few forums so here goes. It appears that various folks have struggled with this process through Vista and Windows XP 64- This is my first post and I've heard nothing but good things about this group. Please help me!

INTENT: I am upgrading a Dell Precision 490 Workstation with Dual Quad Core Xeon Processors, 4GB RAM, and 160GB SAS ATA HD from Windows XP-64 to Windows 7 SP1 Professional 64-Bit. Fresh installation.

CHALLENGE: Windows 7 64-Bit SP1 Professional will NOT see the 2nd XEON processor.

  1. I used MSCONFIG in the start Menu. Went to the Boot Tab. Pressed the Advanced Options Button and on multiple boots did the following: a. Clicked on the multiple processors button and rebooted. b. Clicked it again and rebooted. I was only able to select 4 processors from the single Xeon that the system is seeing.
  2. I upgaded the system BIOS from Dell's A06 to A08.
  3. I entered F2 to enter BIOS setup and looked for any Multiprocessor menu's, support, HAL selection, etc... Nada. There is one menu for multi-threading which this generation of Xeon does NOT support (Xeon E5320).
  4. Went to my local computer store, bought some new heat-paste and reseated both processors. Rebooted and tried #1 and #3 again. No sucesss.
  5. I double checked all the other things you might think about. This is a stock Dell MOBO and I didn't see any CUDA-styled swith (like on the Apple) to reset the MOBO. There aren't any jumpers on this system to turn on/off a dual processor set up. I double checked all the connections to hard-drives, video cards, sound cards, internal USB, and the like with out any success.

1. The BIOS doesn't see anything but processor (0) with a single quad core.


1. I'm new to Windows 7 but wasn't there an ACPI HAL Stuff in Windows XP 64 that you could click or not click for multi-processor support vs. Single Processor Support. Where is this function if available in Windows 7 Professional?

2. I'm going to reseat the CPU's again but this time reverse them (put processor 0 in processor 1 slot and visa versa) so if one of them is bad, I'll see it in the BIOS doing this reversal. I just bought this unit refurbished so I believe I'll be in a good spot since I got a warrenty with it for 1 year and I can easily get a new part.


1. What else is there to try regarding multi-processor support from Dell and the Precision 490 when migrating from 64-bit XP to 64-bit Windows 7 Professional?

2. I do have a Windows Virtual Machine running XP 32-bit emmulator running on the system to use some software that isn't 64-bit compatible and probably never will. Could this cause a problem?

3. Are there any known issues regarding this mess?

My System SpecsSystem Spec

17 Mar 2012   #2

Windows 7 Professional 64-bit

There are a few knowns for others in this situation that need to be said about Windows 7 and that is:

To elaborate, the Home Basic and Starter editions support 1 physical processor, with an unlimited amount of cores. All other editions support 2 physical processors.

Remember, it's processor, then core. A processor consists of cores.


Windows Starter and Home Premium dont' support Muti-Processing
Windows Professional, Enterprise, and ultimate Do.

By the Way, I'm using Professional 64-bit. I downloaded CPU-Z as directed by several other folks wrestling with similar issues on the web. I am copying and pasting the resuts here for your assistance.

CPU-Z TXT Report
CPU-Z version 1.60
Number of processors 1
Number of threads 4

Processor 0
-- Core 0
-- Thread 0 0
-- Core 1
-- Thread 0 1
-- Core 2
-- Thread 0 2
-- Core 3
-- Thread 0 3

Processors Information
Processor 1 ID = 0
Number of cores 4 (max 4)
Number of threads 4 (max 4)
Name Intel Xeon E5320
Codename Clovertown
Specification Intel(R) Xeon(R) CPU E5320 @ 1.86GHz
Package (platform ID) Socket 771 LGA (0x6)
Extended CPUID 6.F
Core Stepping B3
Technology 65 nm
Core Speed 1592.1 MHz
Multiplier x FSB 6.0 x 265.3 MHz
Rated Bus speed 1061.4 MHz
Stock frequency 1866 MHz
Instructions sets MMX, SSE, SSE2, SSE3, SSSE3, 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, 8-way set associative, 64-byte line size
L2 cache 2 x 4096 KBytes, 16-way set associative, 64-byte line size
FID/VID Control yes
FID range 6.0x - 7.0x
Max VID 1.250 V

If you want the thread dumps and all that other fancy stuff send me an email and I'll forward it to you.
My System SpecsSystem Spec
17 Mar 2012   #3

Main - Windows 7 Pro SP1 64-Bit; 2nd - Windows Server 2008 R2

I don't know if this will be much help, but a look around indicates that some people had problems when the CPU's were of different Steppings.

Looks like HP has encountered this:

HP ProLiant DL580 G3 Server series*-* Advisory: (Revision) SYSTEM ROM UPGRADE RECOMMENDED: The Operating System May Stop Responding when Mixed Processor Steppings are Detected in a ProLiant DL580 G3 or ProLiant ML570 G3 Server - c00601484 - HP Busine

About halfway down the page it shows you how to identify which stepping each CPU is.
My System SpecsSystem Spec


 Dual quad core only recognizing single xeon-- help!

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