A quick question.

In one of my Z400s (id 7350913 , called Robert2), the GTX 750 IT has stopped being detected by boinc in the last few days. I can see the 750 with GPU-Z & Precision X. I can even adjust it with two programs. I did not change diver version, still 335.23. I have not changed anything in windows and I have done a soft/hard restart & an unplug restart.

Anyone have any ideas?

By way of information, I have an almost identical 2nd z400 here in my home office and it is fine. The difference is the 750 driver version, 337.88, they were both fine for a long time.

edit - spelling & info
The 750s were overclocked the same & I did roll back the overclock on the problem card.


Robert

Robert,

Could you post the first 30 lines of the event log so we can see what it says.


Zalster

Did you restart the computer?

The first remedy I would try is, in Boinc Manager, go to File > Exit Boinc. Wait 30 seconds and start it again. (I gave it a desktop icon so I don't have to go fishing for it in the Start menu.)

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David
Sitting on my butt while others boldly go,
Waiting for a message from a small furry creature from Alpha Centauri.

I can see the 750 with GPU-Z

But does it show CUDA ? (GPU-Z will 'show' any GPU that have video driver, even very old like GeForce 256)
('No usable GPUs found' shown by BOINC means 'No Computing-enabled GPUs found')

Most probably you allowed Windows to update the NVIDIA driver
The so called 'NVIDIA driver' from Microsoft do not have CUDA

Get the driver from NVIDIA

There is also program CUDA-Z - try it:
http://cuda-z.sourceforge.net/

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- ALF - "Find out what you don't do well ..... then don't do it!" :)
 

Have you try'd to reinstall the driver . If not do it but do a clean install and see if that fixes it

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Per your question BilBg, I did not allow windows to update driver:

CUDA-Z Report
=============
Version: 0.8.207 http://cuda-z.sf.net/
OS Version: Windows AMD64 6.1.7601 Service Pack 1 --->?This is an intel xeon w3565 win 7 sp1 / nvidia gtx 750ti
Driver Version: 335.23
Driver Dll Version: 6.0 (8.17.13.3523)
Runtime Dll Version: 5.50

Core Information
----------------
Name: GeForce GTX 750 Ti
Compute Capability: 5.0
Clock Rate: 1137 MHz
PCI Location: 0:15:0
Multiprocessors: 5
Therds Per Multiproc.: 2048
Warp Size: 32
Regs Per Block: 65536
Threads Per Block: 1024
Threads Dimensions: 1024 x 1024 x 64
Grid Dimensions: 2147483647 x 65535 x 65535
Watchdog Enabled: Yes
Integrated GPU: No
Concurrent Kernels: Yes
Compute Mode: Default
Stream Priorities: No

Memory Information
------------------
Total Global: 2048 MiB
Bus Width: 128 bits
Clock Rate: 2755 MHz
Error Correction: No
L2 Cache Size: 48 KiB
Shared Per Block: 48 KiB
Pitch: 2048 MiB
Total Constant: 64 KiB
Texture Alignment: 512 B
Texture 1D Size: 65536
Texture 2D Size: 65536 x 65536
Texture 3D Size: 4096 x 4096 x 4096
GPU Overlap: Yes
Map Host Memory: Yes
Unified Addressing: No
Async Engine: Yes, Unidirectional

Performance Information
-----------------------
Memory Copy
Host Pinned to Device: 5822.35 MiB/s
Host Pageable to Device: 3410.61 MiB/s
Device to Host Pinned: 5959.76 MiB/s
Device to Host Pageable: 3350.04 MiB/s
Device to Device: 34.6495 GiB/s
GPU Core Performance
Single-precision Float: 900.065 Gflop/s
Double-precision Float: 51.5159 Gflop/s
32-bit Integer: 305.689 Giop/s
24-bit Integer: 222.647 Giop/s

Generated: Wed Sep 24 01:15:54 2014

Hi Glenn, I was trying to avoid any changes in the system but I may have to try the driver reload soon.

Robert

You should be ok if you shut down Bionic . Then reinstall it you should not have to change anything . What ever happened to the cuda driver should be fixed after that . Nvidia can be a little naughty some times i would do the install as a clean install and see what happens

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Before you do anything drastic, I repeat:

Exit Boinc, wait 30 seconds, and start it again.

---

David
Sitting on my butt while others boldly go,
Waiting for a message from a small furry creature from Alpha Centauri.

OS Version: Windows AMD64 6.1.7601 Service Pack 1

This line don't show any Hardware info
AMD64 here means just 'Windows 64 bit'
'AMD64' is the original name of 64 bit instructions AMD invented and Intel later adopted:
http://en.wikipedia.org/wiki/X86-64

Runtime Dll Version: 5.50

It seems CUDA 5.5 Dll is found

I wonder if the info under 'Performance Information' was really measured?
(I don't have where to test CUDA-Z)


Do you look at this computer locally and monitor is connected to GTX 750 Ti ?

---

 


- ALF - "Find out what you don't do well ..... then don't do it!" :)
 

Far_raf,

Trying shutting down and remove the GPU and then reseating it. ( Might not hurt to use some compressed air and clear out any dustbunnies in the GPU and in the case) After that restart and see if Boinc see it now. If not, then I would download the same Nvidia driver and do a clean reinstall and see if that corrects the problem.

Zalster

Guys he hasn't come back to the thread and i just looked at both his machines with the 750 cards and he seems to have validations pending on both machines from yesterday so i'm thinking he has fixed it .

prob just reinstal'd the driver with a clean install and that fixed it .. so well just have to see if he comes back and says what has happend

Ops i didn't look hard enough there all cpu and only 1 gpu but it has CUDA 23 units .

He should have CUDA 50 for that card i'm thinking he is running stock .

download Lunatics and install it and choose CUDA 50 for your cards

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I did not allow windows to update driver:

Are you sure? Ask because if you enable the automatic windows updates and you enable to install the recomended updates then the windows installs the video drives automaticaly too.

You have 2 exactly identical GPU´s on the hosts? If for any reason one GPu is sligtly diferent from the other Boinc will use only the faster of them unless you add the <use_all_gpus>1</use_all_gpus> to your config file.

If that not works, on the other hand who detects the GPU is the OS/driver, so if your OS does not detect the 2 GPU the boinc could not use it. To be sure the driver it´s working, DL a compleate new driver form the Nvidia site and do the clean instalation and befor try to use them in Boinc check if the OS detects both cards (my computer/installed devices).

The lines you posts to answer Zalters question shows the Boinc only see one GPU not two.

Hope one of this help.

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Sorry for the delay in response folks, I did what Glenn suggested and reloaded the nvidia drivers with a clean install. I went to bed right after I fixed the problem.

Thanks Guys

Robert

Hi Juan, good to hear from you again. I took the 2nd 750 out of the 1st Z400 & installed it in a 2nd Z400 I just installed here in the home office. So I am running 2 identical Z400s now.

If you recall it took me a bit to get all the parts to repair the 1st one but it is up and running again.


Robert