For those of you that want to try it here's a Google Page full of Links for your Type of OS.

I installed them on a couple of Box's & haven't had any trouble so far with them. Of course use them at your own Risk

Is there a changelog?
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My PGP key: 0x132B8B2E

No, They Changed from 190.38 to 190.40, other than that there is very little known about them. I installed them on a couple of Win XP Pro SP2 64-Bit Box's that I'm having problems with the Grid Wu's on in hope maybe they would work for me.

Since no other Driver version has worked so far on those 2 Box's I figured they couldn't be any worse than what I was trying already. So I haven't had any problems with them but don't know if they'll run the Wu's or not. I'm trying 2 Wu's on one Box now and will know in the Morning if they kept running or not.

The 190.40 BETA Drivers didn't fix my problem of 1 or 2 Cores of a Dual GTX 260 Box Re-settings themselves to a lower Clock Speed.

No, They Changed from 190.38 to 190.40, other than that there is very little known about them.

If the guru3d site is posting them for download their probably okay. 1 Wu just did successfully finish on 1 of the troublesome Box's, that's the 1'st good one off that Box in 7 Days of trying since it went rouge on me & started spitting out error after Upgrading it to the 190.38 Drivers.

Given that I moved from 178.xx to 190.39 and have not had errors so far on GTX295s, there might be something to the theory that whatever is messing up your system is coming from the 180.x drivers

My train of thought is this:
If those who had 180.xx running (either properly or not) upgraded to 190.xx and now face errors and if someone upgrading from 178.xx to 190.xx (who never installed 180.xx on that system) has not, then there may be a registry setting or file in the 180.xx series that does not mix well with the 190.xx series.

Upon upgrading to 190 I also booted in safe mode and uninstalled 178 and installed 190 again in safe mode. I also renamed the directory where 178 was located so that a windows search for driver components would not find it immediately and override the new files from 190.