1) Message boards : Graphics cards (GPUs) : GPU-Z PerfCap Vrel (load -60-70%) (Message 45485)
Posted 3 days ago by Profile skgiven
'GPU usage' is the overall GPU usage, not GPU usage for a specific application. The OS is probably using that extra 10% of the GPU.

Your motherboards use a 970 chipset, rather than say a 990FX chipset. That in itself can throttle the CPU a bit and in turn the GPUs, but the biggest is PCIe.

PCIe slot 0 is PCIe2-x16, and PCIe slot 1 is PCIe2X4.
For comparison the 990FX chipset can support two GPU's at PCIe2-x16 or 4 GPU's at PCIe2-x8

The competition from the second GPU will to some extent hinder the performance of the first GPU, but with a GTX980 in slot 0 and a GTX750Ti in slot 1 and no CPU crunching you are still going to do more work than with one GPU.

Your W10 system is returning like for like tasks in the same time as your Linux system - so something is wrong there. Were you running CPU tasks on that system or 2 GPU tasks simultaneously?
2) Message boards : News : New server is running! (Message 45481)
Posted 3 days ago by Profile skgiven
The Server Status page says there is no new work, so only a few people will receive resends (of previously failed or aborted tasks) until new work is added to the queues.
3) Message boards : Graphics cards (GPUs) : NEW NVIDIA GEFORCE DRIVERS (Message 45399)
Posted 8 days ago by Profile skgiven
The announcement of a new driver basically just tells us that there are is a new driver and suggests what non-GPUGrid improvements it brings. That doesn't tell us if the new driver improves stability for here, or anywhere else, or if the driver is faster or slower for here.

Perhaps this thread could also be used to report on driver performance too?
People could post their relative performances of old and new drivers (for the same task type) when they change drivers.
For non-Pascal cards 355.82 or 359.6 might be the fastest drivers on Windows, with subsequent drivers all being somewhat slower. Don't know what the fastest drivers are for Pascal GPU's.
Generally it's useful to know if a driver is slow, just as fast, buggy, or resolves bugs/improves stability.
4) Message boards : Graphics cards (GPUs) : NEW NVIDIA GEFORCE DRIVERS (Message 45394)
Posted 9 days ago by Profile skgiven
The picture is from NVidia but the GT440 is generally considered a bit too old architecturally for here now; it's CC2.1. That said some of these old Fermi cards have successfully returned work since it was announced that they would no longer be supported. AFAIK Fermi's do not work under Linux (as the Linux app doesn't include an image [architecture map] for them).

Not sure why NV don't list a GT440 (96shaders) but do list a GT605 (48shaders). Maybe NV consider it to be both too old and an entry level card. IMO the driver wouldn't contain anything for such cards anyway; most of these updates are to support the new Pascal's better or improve gaming performance. Updates also tend to slow down GPU crunching, so generally it's best to not upgrade unless you have a reason.
5) Message boards : Server and website : Slow downloads and --pers_retry_delay_max 60 (Message 45382)
Posted 10 days ago by Profile skgiven
Is this still an issue after the new server was installed (assuming it was; didn't notice anything)?
6) Message boards : Server and website : The Stats Tab (graphs) is not updating (Message 45381)
Posted 10 days ago by Profile skgiven
Yes, we will delete it now.

Deleting something isn't the same as making it work!
Now that you have a 'bigger' server, why don't you use it to do some basic stats?
7) Message boards : Number crunching : Best Operating system (Message 45376)
Posted 10 days ago by Profile skgiven
The WDDM overhead is the biggest OS choice concern; it's impact is over 10% but closer to 20% for many. XP & Linux are the best operating systems as they don't have the WDDM overhead (which is larger with larger cards); the bigger your cards the more important to avoid the WDDM overhead.

The other main OS consideration is the generation of GPU you are using:
Your 1060 won't work on XP, so it's Linux or the 10%+ WDDM performance hit.
Note that the Pascal's wont work on Vista either.

Because SWAN_SYNC is enabled in the Windows app, XP is probably the fastest overall (for non Pascal cards), though running two tasks at a time on Linux might yield the same overall throughput.

As Linux is free and comes with Long Term Support (updates) it would be my first choice for crunching here. Others might prefer the familiarity of XP or want to dual boot.
8) Message boards : Graphics cards (GPUs) : "Computation error" for ALL tasks using GeForce GT 730 (Message 45375)
Posted 10 days ago by Profile skgiven
The Error is,

    #SWAN: FATAL: cannot find image for module [.nonbonded.cu.] for device version 210


The app is saying it doesn't support the CC2.1 GPU (there is no image for it).
The task doesn't even start:

    Run time 0.00
    CPU time 0.00


The GPU isn't supported by the app, so it can't crunch for GPUGrid.

9) Message boards : Number crunching : The Radeon can officially host NVIDIA CUDA code (Message 45349)
Posted 13 days ago by Profile skgiven
It's moved from dev to beta but it's likely that porting from CUDA to OpenCL/GL/HIP/CAFFE... will always result in some performance loss; NV design their GPU's to run CUDA while AMD are coding to make their GPU's compatible/porting via a toolkit from CUDA into their code to utilize their non-CUDA GPU designs.

CUDA is also in continuous development, so when trying to emulate CUDA, AMD will always be playing catch up.
10) Message boards : Number crunching : Discussion of Ubuntu 16.04-x64 LTS installation and configuration (Message 45348)
Posted 13 days ago by Profile skgiven
Tried to use the 375.20 repo drivers on Ubuntu 16.04_x64 LTS but could not get Boinc to recognise the GPU. Tried lots of tricks (repeatedly) but none worked. Reverted to 370.28 and things are working again. X server said the 375.20 driver was there but maybe it didn't fully install.
For here there is no known reason to upgrade - I was just looking to see if there was anything in it (library updates that might make things faster), on the off-chance. There usually isn't BTW. If anyone tries to use 375.20 and can't get it to work, don't spend too much time on it.


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