hans_glans

Thank you! I made 3070 work on driver 466.77 on Windows 1709 (build 16299). Here, this combination worked: 1. 00 7C 3F 00 (16252) replaced with 00 0F 3A 00 (14863) and 2. 00 AD 42 00 (17069) with 00 AB 3F 00 (16299)) For 4070 and driver 531.61 (531.41 is the earliest driver supporting 4070) on 1709, I don't know what to modify. I'm not experienced with WinDbg to find the new hex values to modify via debugging. This is especially difficult because "1803" being the minimum Ampere/Lovelace winver requirement could mean beta builds from 17069 to 17763. So this would be a lot of trial and error without proper debugging. How do I debug the .sys file to nail down the values to change?

@halohalo I got the 3070 working on 1709 (472.12 and 466.77). Now for the 4070, the same hex tweaks don't work and the minimum supported driver is DCH only now (531.41). Which values do I modify for the driver to run with the 4070 on 1709 (16299)?

What do you mean by performance decrease? Caused by what?

Is there any way to not have testmode on?

Yes, highly depends unfortunately.

With WinDbg or IDA? Is checking the highest winver in the INF file and replacing it's hex value in the sys file with one version earlier the correct approach?

I think I got it but can't try myself. Just tell me if its correct please: For 472.12, we know the supported version is 17134 which is "42EE" in hex. After removing the OS requirement from the INF file and installing the resigned driver and getting error 43, we copy nvlddmkm.sys from the folder, and instead of "42EE" we put "3FAB" (16299), put the file back in and (possibly with test-signing and disabled integrity check) reboot. Correct?

But basically it is: - install driver with modified INF (-> error 43) - change respective OS hex value in nvlddmkm.sys correct?

No, it goes back to the initial problem in this thread. 3070 is only supported from 1803 onwards, irrespective of the driver. I'm just wondering which hex value in nvlddmkm.sys has to be adjusted after modifying the INF file.

Which hex should be edited for a 3070 on 1709?