Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.

Windows 7: Twin Quad Core Xeons - Only One shows!

19 Feb 2010   #1

Windows 7 Ultimate x64
Twin Quad Core Xeons - Only One shows!

I have an HP XW6400 (dual cpu motherboard) workstation which has been running fine on a single Quad Core Xeon processor. Today I decided to fit a second Xeon cpu and was suprised to find that although it was detected in the bios, Windows 7 seems to still only show one cpu in Task Manager. Device Manager however detects all 8 cores (count 'em folks ) Also diagnostic progs like Sisoft Sandra only see one processor (4 cores)

Am I missing something here?

p.s. Win 7 Ultimate x64

My System SpecsSystem Spec
19 Feb 2010   #2

64-bit Windows 8.1 Pro

Go into msconfig/boot/advanced and tick the processors to two ... hope this helps...
My System SpecsSystem Spec
19 Feb 2010   #3

Windows 7 Ultimate x64

Thanks for the tip - however that just reduced the number of cores to two!
So just to experiment I reduced it to one and now I can't even bring back any more cores - I'm stuck on ONE CORE now

MSConfig is obviously the source of my problem but how can I reset it to get all of my cores back?? (I'm still showing 8 cores in Device Manager)
My System SpecsSystem Spec

19 Feb 2010   #4

Windows 7 Ultimate x64

I've sorted it now

I had to reboot a couple of times while resetting msconfig to 'normal startup' and all of my cores magically returned - all 8 of 'em.

btw the 'number of processors' in the boot options is definitely referring to the number of cores - and boy does having 8 make a difference! My index rating jumped from 6.8 to 7.4 so my hard drive looks like it is holding me back now - SSD will be ordered shortly.

Thanks for pointing me in the right direction Tews, even if it made me panic at first
My System SpecsSystem Spec

 Twin Quad Core Xeons - Only One shows!

Thread Tools

Similar help and support threads
Thread Forum
Quad Core detected as single core
Hello yesterday i've made a system restore and some apps like Coretemp, CPU-Z and HWMonitor gives me as result Core #0 but in task manager on performance tab it display the four cores working. I read in some other threads about the advanced option in msconfig i've already checked\unchecked the...
Hardware & Devices
Is this good gaming? Intel Core i5-2400S Quad-Core Processor 2.5 GHz 4
Here's a link to what I'm thinking about buying. I've never messed with these "barebones" PCs before. What exactly will I need for it to run games like BF3. Thanks, sorry if I'm being vague, I really don't know too much about this area of PC Intel Core i5 2400S Quad Core Processor 2 5 GHz 4 GB...
Quad core processor only running on one core.
I'm having an issue with my CPU. It seems that it is only using one of its cores. This issue first became apparent to me when I was trying to run Blacklight Retribution. It popped up a warning message saying that my computer does not meet the minimum requirements of have at least a dual core. ...
Hardware & Devices
Wondering about upgrading from dual core to quad core CPU with Win 7
I am just wondering about the CPU I just ordered from E-Bay new and how it will perform with Windows 7 64 Bit compaired to the one I have now this is the one I ordered: AMD Phenom X4 Quad CPU 9500 AM2+ 2.2 GHz 3600MHz 4MB :D This is the one I have now: AMD Athlon 64 X2 Dual core 3800+ 2GHz I...
Hardware & Devices
Quad core or phenom dual core
hey guys im sorta stuck on what chip to get best for gaming could you tell me which one would be best thanks these are the two AMD 640 3.0 Quad core AMD Phenom dual core 550 Black edition thanks
Upgrading from a dual core to a quad core!
Hi all! I am not computer illiterate. I have a question for you. I am switcing from an AMD dual core 2.4GHz to a Phenom 9750 Quad core. Changing out the heatsink and fan also. Can I just swap out the CPU's and restart Windows 7 Ultimate 64bit. Or do I have to do a complete reinstall of the same OS?...
Installation & Setup

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 01:57.
Twitter Facebook Google+ Seven Forums iOS App Seven Forums Android App