Which is the best driver for the GTX 750ti?
I had a system with the 368.81 driver happily running a pair of gtx 980tis, and, just for grins swapped them for a pair of gtx 750tis, and the system became very spastic graphics-wise, with lags and displays taking a LONG time to finish when running SETI.

The latest driver is 373.06 (I think). Would that be better, or do I want to devolve to an older driver? Or is it something else, maybe? (Suggestions appreciated!).

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Or is it something else, maybe? (Suggestions appreciated!).

Most likely the application being run & it's settings.
The GTX 980Ti has 22 Compute Units.
The 750Ti has 5.

Settings that don't cause issues on more powerful hardware can cause issues on less powerful hardware.

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Grant
Darwin NT

I am running 373.06 in my Windows 10 PC with GTX 750 OC and it runs well. Contrarily to what is being said. Windows updates do not overwrite my nVidia drivers.
Tullio

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Did you reinstall the drivers after the swap?

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Did you reinstall the drivers after the swap?

No

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Sorry tullio, I should have clicked on Cruncher's post and responded but......

I was being lazy, lol...

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Did you reinstall the drivers after the swap?

No

Me neither.

I am running the 750tis on another system now (FX-8350, GA-990FXA-UD3) with the latest driver (373.06) and all is fine.

Running 3 WUs/card; is that OK for these, or is the general consensus that it is better for 2?

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Two days ago I backed my 750Ti's down to 1 SOG task and it made a slight improvement over 2 tasks, and freed up an extra CPU core on each computer.

It looks like you are running CUDA on you 750's so it could be different for you. I would say 3 is too much.

While 3 WUs will certainly run, I switched to 2 on each of my 750TIs and then With the SOG I tested for a month and then switched to 1 on each 750. At present that is the most productive setup. (This is from my RAC which I only check after at least two weeks - it has been going up in a steady climb after a bit of down time when I was away)
As was mentioned, it also frees up a CPU core for work there. I do not use any command lines (I will someday test that) but my WUs generally take 15-20 minutes on the 750s.

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SETI@home classic workunits 4,019
SETI@home classic CPU time 34,348 hours

Have the more recent driver been found to be any more effective?
I'm using 364.51, mostly because I'm lazy about upgrading drivers, but I don't see much difference in the few other 750ti's I've looked at.

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SETI@home classic workunits: 93,865 CPU time: 863,447 hours
Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[

Have the more recent driver been found to be any more effective?

Driver upgrades are all about games.
The original release version for support of a particular group of hardware offers as much performance for computing work as any of the later releases. Unless there is a specific bug fix for CUDA/OpenCL/Vulkan in a later driver, there is no benefit in upgrading video drivers from the initial working release when it comes to GPU computing.
Generally; if it isn't broken, don't fix it.

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Grant
Darwin NT

Have the more recent driver been found to be any more effective?

Driver upgrades are all about games.
The original release version for support of a particular group of hardware offers as much performance for computing work as any of the later releases. Unless there is a specific bug fix for CUDA/OpenCL/Vulkan in a later driver, there is no benefit in upgrading video drivers from the initial working release when it comes to GPU computing.
Generally; if it isn't broken, don't fix it.

I generally don't update specific things when they are working, but I know some people keep up on the bug fixes or know about specific driver app issues.
If I'm not using an NV GPU I generally don't read to much into the issues that are happening. Since I starting playing with my 750ti again I figured it might be good to check in the event I missed something important.

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SETI@home classic workunits: 93,865 CPU time: 863,447 hours
Join the [url=http://tinyurl.com/8y46zvu]BP6/VP6 User Group[

Vulkan and dx12 are still evolving, so where applicable this will be a factor. This is a positive for development (where Cuda and OpenCL rely on these), but a transitional burden. Naturally in the case of dx12 you're looking at win10 only, while the vulkan infrastructure (especially compute) seems to be receiving a lot of attention from all parties other than m$.

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"Living by the wisdom of computer science doesn't sound so bad after all. And unlike most advice, it's backed up by proofs." -- Algorithms to live by: The computer science of human decisions.