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Hardware diagnostics apps for memory / processor

I am having intermittent bluescreens on my computer and I'm trying to get some apps that I can use to diagnose exactly where the fault is.  I've used the MS memory tester, which showed no errors and I've also used "Hot CPU Tester" which showed an error in the "Complex Matrix" test (Error:CPU 0: Checksums do not match).  Ideally, I want some software which will actually tell me what caused the error (Processor, memory etc) so that I can give this information in as proof for a warranty claim.

I don't mind paying for the software, and I'd prefer it if the software ran outside of windows so that the hardware company can't come back to me and say it's a driver / windows error rather than a hardware problem.

Thanks in advance.
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Just got through two full passes of memtest with zero errors whatsoever.  The reason I think it's hardware related is that the system was running stable for about 18 months and then started bluescreening on all sorts of different things with no apparent reasons.  Windows error reporting has told me that the cpu has reported a hardware error, the memory address for the app was corrupted and that it suspects faulty drivers (All over a number of different bluescreens).  Have clean installed and still getting bluescreens (Even got them just after installing on one of the attempts, before I had even added the driver packs).  System is not overclocked, very well cooled and uses top of the line hardware.

I'm still suspecting a motherboard / cpu problem as I just can't get the memory to fail.
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Paul S
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Here is the list of most frequently used and most popular hardware diagnistic utilities .
It's a Google list of "most wanted" apps :
http://directory.google.com/Top/Computers/Software/Shareware/Diagnostics
   
 good luck
nedvis
The_Computer_Guru_777: Are these stop errors stored anywhere?  I have a ghosted backup of the system prior to rebuild that I can get them out of.  Nothing in my event log after the rebuild as I cleared it this morning.
I'm now 99% sure it's not a memory issue.  Haven't been able to get a single failure on memtest, MS memory test or Docmemory.

Ultimate Boot CD is pretty useful, thanks, although there's not much in the way of cpu related testing on it.  Funny really, you'd think that Intel / AMD would have diagnostic utilities for their chips.  I'm going to have to go through the google / benchmarkhq lists to see if any of those apps are more helpful.
#1, in the future, please always post your Operating System/any upgrades with any hardware questions, just helps us help you.

memtest is THEE #1 pplication for memory testing, while it never hurts to try multiple apps, rest assured that memtest is one tool to keep and bookmark for ever.

honestly, one problem could be a BAD CD....a cd with scratches or defective will sometimes install, but you won't know that it was the installation itself that cause the problem

#2 one thing you could check, but not always helpful is (hoping you're on xp)
1)open up MY COMPUTER
2)right click in the UPPER LEFT corner, directly on the Computer icon
3)choose MANAGE
4)on the left hand side click the PLUS sign next to EVENT VIEWER....there are 3 different categories, you might be able to track it down via those error messages
Ok, well I'm running XP SP2 (With all patches as of 27/02/2005).  Hardware is as follows:

Asus A7N8X Rev 1.04 (Tried latest standard and beta bios),
AMD XP 2800+ (Not overclocked),
1GB Corsair Twinx XMS3200 Dual Channel DDR-SDRAM (Cas 2, Ras to Cas Delay 2, Ras Precharge 2, Cycle Time 6),
ATI Radeon 9800+,
Western Digital Raptor 36gb HDD.

Actually considered the bad cd and tried another, but with the same results after the install (I've spent a lot of time on this!).  Get no errors in the event logs, other than when I get the bluescreen (But I don't have any right now as I cleared the logs this morning to make them easier to look through).
(That's 27th Feb 2005 for those confused by UK date style!)
<< The reason I think it's hardware related is that the system was running stable for about 18 months and then started bluescreening on all sorts of different things with no apparent reasons. >>

Funny, that would make me suspect that it is a windows problem, typical symptoms of windows going bad.

SP2 is a potential problem, an uninstall is often needed.  Another thing that can totally hang a system is a bad CD/R or disks in the CD/DVD drive that are bad and cannot be "seeked" by windows explorer.  Short of that, you might be looking at some significant windows debugging, not hardware.

Have you checked the CPU temp. with the ASUS monitor?  If it goes over 55 degrees, especially over 60, start getting worried.  Have you checked the PS -- temp swap in a different one?
I'd have thought the same thing, but even after the clean rebuilds it would bluescreen, both before / after sp2 and before / after installing the driver packs.

I used the "Mersenne prime" application on the Ultimate Boot CD last night.    After five hours and one minute it failed with "FATAL ERROR: Rounding was 0.499..... expected less than 0.4.  Hardware failure detected, consult stress.txt".  Haven't looked up the exact meaning of that yet.

CPU never gets above 55 Celsius at full load (Case temp never higher than 25 Celsius).  Voltages are as follows (Low / High / Average / Max Percent Outside Target Voltage):

Core 0: 1.60v / 1.68v / 1.65v / 3.1%
Core 1: 1.60v / 1.68v / 1.65v / 3.1%
+3.3: 3.25v / 3.30v / 3.27v / 1.5%
+5.0: 4.78v / 4.81v / 4.79v / 4.6%
+12.00: 11.55v / 11.61v / 11.58v / 3.8%
-12.00: -12.13v / -12.07v / -12.08v / 1.0%
-5.00: -5.09v / -5.06v / -5.07v / 1.8%

All voltages are within 4.6% (or better) percent of target, but then I'm not sure how tight they should be.

XP 2800+ (Barton) Specs:
Nominal Voltage: 1.65v
Max Die Temp: 85 Celsius
Attach the 3 to 4 minidumps at any webspace. I will process the dump and find which hardware component is faulty. You can find the minidump at the folder \windows\minidump
cpc2004: www.tacticaladvantage.co.uk/minidump.zip

The dump files in that zip are all the ones from the most recent clean build of XP (The one I'm working on now).  Thanks.
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Interesting, thanks for that.
Still, I would at least install something basic like win98se -- maybe even DOS?? -- and run it for a day.  Wouldn't you be surprised if 98 never froze, but XP did, right?
I've tried running the DOS mode (and linux mode) diagnostic apps and so far I haven't made it past 8 hours of testing.
It is a hardware error. There has no sharewre can diagnostic which hardware is faulty. Windows use special coding to make use cache memory and it is different to DOS mode program.  Hence most faulty CPU and m/b can pass memest utility. Only the PC computer manufacturer such as IBM notwebook has built-in utility to diagnostic hardware. Your PCs crashes due to hardware problem and the minidumps have the snap shot when the hardware occurs. It is the cache memory problem either in the m/b or cpu.  According to my experience 70% is faulty m/b and 30% is the faulty CPU.
It would have to happen in the only part that's not in warranty!  Ok, thanks all. I've got to work out a fair way of awarding the points on this one which I'll try to do later today.
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Ok... I think that's about as fair as I could make it.  Ideally I would have opened up a new 500 point question for CPC for going above and beyond the call of duty; but apparently that's not allowed. Sorry.

Good answers, thank you very much.
no, you can and should open a NEW question when wandering from the original post this happens all of the time:)

I have low points, but do this too:)
Cheers