Win7 x64 only seeing 1 of 2 CPUs installed

Hello:
I have a custom built system:
MoBo: Tyan S2895 Thunder K8WE
CPU: Dual, Opteron 280 2.4 MHz Dual Core
RAM: 12GB DDR 400 ECC Registered Corsair
HDD:
C: WD VelociRaptor 150GB
D: WD VelociRaptor 300GB
E: WD VelociRaptor 300GB
Various external HHD's
GPU: NVidia GeForce 7900 GT/GTE
O/S: Win7 x64 Ultimate

I've set up a dual-boot system. the C drive is partitioned and the other O/S is XP Pro SP3 x86. I did this to test audio programs to confirm they are compatible with 7 & with an x64 evniro. Everything has passed testing & I'd like to get rid of XP. However a new issue has come up over the last 3-4 days.
When I boot 7 I'm getting some very odd behavior. The most critical issue is it is suddenly only "seeing" or reporting that I only have 1 CPU (see attached screen-shot 1 & 2). Prior to this it has been reporting 2 CPU's, 4 cores.
The BIOS reports 2 CPU's & if I boot XP it also reports 2 CPU's, 4 cores.
The 2nd issue that I'm experiencing is with RAM. 7 is reporting 32.5GB installed on 12GB usable. I only have 12GB installed. The BIOS passes & reports the full 12GB installed. I have not set any over clocking features in BIOS & the MoBo is old enough that it does not have options to have over clocking controlled/config'd via software. Previously 7 had been reporting 12GB installed/usable. And of course XP only reports 3GB due to limitations of x86.
This computer is primarily used for audio recording/production. There are no out of the ordinary programs installed or used. There have not been any hardware of software changes made for 4-6 wks. The only errors in Event Viewer since 05/17/2011 are in the application log and are regarding SideBySide & VSS.

I've been researching the issues but have not found anything regarding the CPU's. The only info I've found for the RAM is about the O/S not seeing all installed RAM.
Has anyone else experienced this or have any ideas?

Please provide screenshots from CPU-Z, from the tabs for CPU, Mainboard, Memory, and all the SPD slots.

Also, can you please provide a screenshot from task manager: Start -> Run -> Taskmgr, then select Performance tab, and push Resource Monitor button. Then select the Memory tab, and take the screenshot of the bottom of the screen where it shows the color-coded and numeric value memory allocations... including "hardware reserved".

Also, please simply attach your JPG screenshots here directly as "attachments" (using the paperclip button to add them), rather than imbedding them inside of a Word document and posting the word document as the attachment.

I grabbed another HDD, a 74GB WD Raptor I happen to have handy & installed 7 on it w/all the same programs and settings as the dual-boot HDD. It reported dual, dual core CPU's and reported 12GB RAM installed & usable (however its giving me a BSOD error of X0124 which I will research independantly from this thread).
Would running Win Repair resolve the CPU/RAM issue?
I was incorrect on the RAM. I have both Micron & Corsair installed. Just loaded the box up for testing purposes. I will be ordering new RAM once I have all the issues/bugs sorted out.
All requested SS's are included. Thanks for taking a look.

whs said:

The most reliable information you will get from the Resource Monitor. Go to the CPU tab and see how many CPU graphs you have on the right side. Then go to the Memory tab and the colored bar will show you the RAM story.

He already posted that screenshot in response to the original request. It's the last one shown.

Bizarrely, it shows:

hardware reserved - 20994MB
available - 10322MB
cached - 1780MB
total - 12286MB
installed - 33280MB

Something's clearly wrong, and it's obviously at the BIOS/hardware level. Obviously, the motherboard manual should be referenced for memory usage information.

I think it is tied to the mismatch in slots #7 and #8 for those two 1GB Corsair cards which are actually different part numbers, and have different sets of JDEC timing numbers.

The pairs of memory cards in #1/#2 seem matched, #3/#4 seem matched, and #5/#6 seem matched.

But #7/#8 seem to be incompatible. Can't help but believe this is directly a factor. These only add up to 2GB anyway, so losing them wouldn't be a major issue in the short term.

It would be worth an experiment to remove the two cards in slots #7 and #8, just to see if things clean themselves up.


Also, the 20994MB "hardware reserved" item in Resource Monitor is obviously bogus. But it would be interesting to see where this memory is theoretically reserved.

Start -> Run -> DEVMGMT.MSC, to get Device Manager. Then View -> Resources by type, and close up any expanded categories except for Memory which should be expanded. The information shown is by hardware device, showing a low-high 64-bit hex address range.

Unfortunately, the subtraction is not shown in a separate column or item which would be very helpful and user-friendly. But it's not. So it's not obvious without using Calculator to do the required hex arithmetic (unless you're familiar with hex in your normal life) and can spot the "culprit" somehow primarily responsible for 20GB "hardware reserved" which should really stand out I would imagine... since only 12GB is actually installed.

Anyway, looking at this memory assignment should be very interesting.


But first, I'd pull the two mismatched 1GB Corsair memory cards in slots #7 and #8 and see what happens.

pooch said:

I came across this RAM problem very recently and I believe it is due to a mismatch of the installed RAM could it be that you have 1gig and 2gig working together in dual channel?

The MEMORY tab screenshot shows DDR, not DDR2.

All his memory sticks are also shown as just DDR.

I don't think this memory configuration is working as expected (obviously!).

dsperber said:

Something's clearly wrong, and it's obviously at the BIOS/hardware level. Obviously, the motherboard manual should be referenced for memory usage information.

I'm not seeing how it's "obviously" BIOS/HW level. The only change that I've deviated from in the default BIOS config/settings has been changing the setting for O/S type from x86 to x64. This was done per the manual so "obviously" the manual has been referenced along with Tyan's website.
Additionally I've attached SS of DM, By Type, Memory.

might sound weird but if you have a spare hdd you could install windows 7 to that and see what happens.

i know it's not the most techy of idea's but if your windows install is gibbed then at least you'll know.