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Windows 7: Win7 x64 only seeing 1 of 2 CPUs installed

13 Jun 2011   #11
Microsoft MVP

Windows 7 Ultimate X64 SP1

Quote   Quote: Originally Posted by bitfiend View Post
If I boot to 7 on the other HDD I installed it on today, both CPU's & all 4 cores are reported. It doesn't matter if I have only the Micron or the Corsair or mixed sticks of RAM on the board. It still boots up just fine and reports both CPU's are there and usable.

And just in case I've included an SS of the CPU tab in RM.
Sounds like the initial Win 7 install is corrupted in some way.

My System SpecsSystem Spec
15 Jun 2011   #12

Win7 x64 Ultimate
Issue Resolved

Quote   Quote: Originally Posted by gazz9496 View Post
might sound weird but if you have a spare hdd you could install windows 7 to that and see what happens.

Gazz9496 that’s already been done as stated in an earlier post & 7 reported 2 CPU's & all 4 cores. And no that doesn't sound weird as with any problem of this nature I've experienced in the past, resolution only seems to come once all other possibilities have been eliminated. By installing 7 on the 2nd HDD it's eliminated several things and is pointing me to either the O/S its self or the original HDD XP & 7 are installed on.

Dang, I was hoping that posting this would flush someone outta the woodwork that had dealt with this as well. Oh well.....

At any rate this is resolved. How you might ask. I have no bloody idea! I have been trying just about anything I can think of or run across researching this (which is next to nil....actually nil).
Just as a shot in the dark I booted into safe mode (again) and poked around. As usual I didn't find anything new or unusual so I re-started.
I booted to 7 and once the O/S came up I checked taskmgr>performance (tab) as has become habit after every re-start or cold boot. Low & behold it was reporting 4 cores in CPU usage history. I checked the System panel and it's reporting Dual Core AMD Opteron Processor 280 2.41 GHz (2 processors).
Unfortunately I have no idea why. I've been in and out of Safe Mode several times a day since this started occurring. This last time I didn't alter any settings or configs.
The computer has been up & running stable for just over 48 hrs as well. I'll report back if anything should change.
Oh regarding the RAM issue. It's the one stick of the Corsair XMS RAM that is throwing the count off & causing 7 to report 32.0 GB installed **GB usable. I've removed it a couple of times and every time I do 7 reports 11GB installed & usable. When I re-install it 7 reports 32GB installed 12GB usable.

Britton30 that was my initial thought as well. I was hoping to find out I was incorrect for thinking that but no such luck. I’m worried that still may be the case since all reports from XP & the 2nd HDD with 7 installed were/are correct. The rock solid solution will be to go ahead and switch to the clean install of 7 on the 2nd HDD once I finish installing all needed software & drivers to it.

Thanks for your responses everyone,
My System SpecsSystem Spec
18 Jun 2011   #13
Microsoft MVP

Windows 7 Ultimate X64 SP1

Well Bit, I'm very glad you have sorted, sort of, for now.
Windows, while not Artificial Intelligence, seems to have a mind of its own sometimes.
My System SpecsSystem Spec


 Win7 x64 only seeing 1 of 2 CPUs installed

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