Fatal error: NaN detected

goobee · Post by **goobee** » Fri Apr 20, 2007 2:19 pm

I've been getting a lot of these NaN errors. My Opty box is not overclocked and passes 4 instances of Prime95 torture test just fine.

I removed the -advmethods so that I don't get any beta units and it sorta helped. I removed -forceasm and it made no difference.

Any idea what's wrong?

Box consists of:

2 x Opty 270
2 x Thermalright XP90 hsf
4 x 1gbs PC3200 ecc/reg ram (all single rank)
Asus K8N-DL mobo (tried 2 boards, same errors)
Generic X700 PCIe video Card
500watts Antec EPS powersupply
Windows XP x64

4 x instances of F@H

YARDofSTUF · Post by **YARDofSTUF** » Fri Apr 20, 2007 2:46 pm

http://forum.folding-community.org/view ... n+detected

Best I could find.

goobee · Post by **goobee** » Fri Apr 20, 2007 11:00 pm

Hi YoS,

I think I'm OK now. After I purged my WUs, all 4 instances have been running fine for the past 6 hours or so. Before, it wouldn't even do an hour before crashing and burning. I'm leaving the -advmethods off, I think this flag let's beta units download. It must be bad beta units that are unstable. In any case, I put -forceasm back on and it's still going OK.

goobee · Post by **goobee** » Sat Apr 21, 2007 4:41 pm

Nope, I was wrong. Ran fine for like 12 hours but still errored out after a while.

rickoic · Post by **rickoic** » Mon Apr 23, 2007 9:15 pm

NaN stands for "Not A Number".

Means that in a calculation that expected a number to be passed to it got a alpha-numeric character instead.

Believe I read someplace before that this could be a RAM problem.

You might want to run a memory test on your ram just to check it out.

Tks
Rick

goobee · Post by **goobee** » Wed Apr 25, 2007 4:01 am

Hi Rick,

I'm running memtest86 right now. So far, no errors. I'll leave it going over night and see what happens.

goobee · Post by **goobee** » Wed Apr 25, 2007 12:35 pm

Almost 10 hours, no errors found thus far. Still running.

YARDofSTUF · Post by **YARDofSTUF** » Wed Apr 25, 2007 6:39 pm

probably not memory then.

Its not the in C:\program files\ folder is it?

goobee · Post by **goobee** » Wed Apr 25, 2007 8:19 pm

YARDofSTUF wrote:probably not memory then.

Its not the in C:\program files\ folder is it?

No, I have them on the "D" Drive as such:

Main Directory

D:\Folding

Sub Folders

D:\Folder 1
D:\Folder 2
D:\Folder 3
D:\Folder 4

This is how I have been folding for years now.

No memory errors detected after 13 hours so I'm pretty sure the ram is OK.

So far I've swapped mobos, swapped power supplies and CPUs. The memory is ruled out as a result of my testing. The video card is the only thing left I haven't considered and I doubt it can be screwing with F@H. I guess the only thing left is to do a new Windoze installation at this point.

Oh, one last thing. This box is my stand alone MySQL server. All it does is serve MySQL and Fold 24/7.

goobee · Post by **goobee** » Thu Apr 26, 2007 9:24 pm

OK, it's fixed. I had a bad Windows x64 installation it appears. I reinstalled everything from scratch last night and after 18 hours, no F@H errors.

Talk about a whole bunch of work for nothing.