From what I remember, the 100 Wu limit was imposed because after the outage (any outage in fact) the database was unable to keep up with the large amount of results being returned in one go.

So in fact now that GPU's have got faster and there are many multi GPU machines it would probably be even worse, add in Linux and the special sauce and well..

Someone should do a few sums on how many WU's the top 100 machines process per hour, times that by the nominal length of an outage an see what total number of WU's being returned from just the top 100 would be.

no surprise to me.
With r_3500 you are using _period_iterations_num 3 and with r_3584 you are using no app args.

Set NNT and complete all other tasks, then remove your SETI account from that machine, give it a short while then add SETI again, you may wish to reset NNT until you get machine set up as you require.

I use this method to remove ghosts and accumilated old files in CPND.

In BOINC just highlight the tasks you don't want, and click "Abort"

They will be released and resent to other users.

How can I tell if an app is Apha or Beta?

You just would not see alpha unless your hacking abilities good enough LoL
Alpha releases are closed ones and not going to be published in anonymously accessible parts of internet.

may I remind all and sunder that ALL GPU apps are still in ALPHA?

that means IF you run them you need to pay VERY CLOSE attention to your hosts and report invalids and inconclusives that look like they will go invalid. Alpha apps are very likely to still have problems. Only when they have been promoted to beta the dev is fairly certain they are good. (and sometimes not even then).

IOW when you run an alpha app you need to be aware that you are TESTING it.
When you have the hood open on the car, you wouldn't let your kid behind the wheel, now would you?
Just running an alpha app is irresponsible. You might as well give the car keys to your kid when you are not sure the brakes work.

I don;t want to discourage people to alpha test. I just want to make sure you know exactly what you are doing, why you are doing it and what you need to look out for when doing it.

I tried the MB8_win_x86_SSE3_OpenCL_NV_r3310 app on my GTX970 but it seems to hog a CPU core as well

Yes they do like the CPU cores don't they, lol...