i recently got the Y700-15ACZ as well.
I simply installed the latest driver for the R7-IGPU (15.201.1301.1007 Beta (Crimson 15.12)) first, then i installed the latest driver for the R9 M385X (16.200.1025.0 Beta (Crimson 16.6.1)).
(€dit: Of couse i uninstalled the Lenovo Driver first with the AMD Clean Uninstall Utility)
Originally Posted by msxyz
I wasn't able to test Carrizo internal GPU. Catalyst won't let me choose that unless it's running from battery. Also the Lenovo branded Catalyst lack the overdrive option so I couldn't experiment with the GPU frequency to try limiting the throttling or to observe the effects on temperature and performance by lowering the clock. Today I'll try to enforce that from the BIOS (there is an option there) or I'll probably try the new Crimson drivers.
With this driver setup i can just go into "advanced radeon settings" and set for each application (or globally), on which GPU it should run.
It's actually possible to "over"clock the R9 M385X with Afterburner, you have to enable the inofficial OC-Limits and inofficial OC-Mode.
And you have to run an application which forces the R9 to turn on, otherwise you can't apply the settings.
However, it seems to be quite pointless, when i overclocked the VRAM to 1350MHz (from 1200), the GPU just stayed at 300MHz. Probably some aggressive settings from lenovo to stay within the power limit.
Of course overclocking the GPU in a laptop isn't a great idea anyways.
But maybe someone with more experience can make use of that.
I made a script for AMDMsrTweaker to lock the CPU, so it wont clock below 2,1 GHz (that's the highest possible *non-turbo* Clock)
While gaming, the Cores sometimes usually clock down to 1,4GHz for half a second or so, with this script it will only go to 2,1GHz.
I didn't do much testing yet, so i can't tell you if it will actually improve Framerates or if it's a good idea in general though.
start C:\xxx\AmdMsrTweaker_1.1\x64\nowindow.exe AmdMsrTweaker.exe P0email@example.com P1firstname.lastname@example.org P2email@example.com P3firstname.lastname@example.org P4email@example.com P5firstname.lastname@example.org P6email@example.com P7firstname.lastname@example.org APM=1 Turbo=1
btw.: The "real" Voltages for Carrizo in AMDMsrTweaker seem to be 0.775 + ("Voltage in Script"/2).
Unfortunately, it doesn't allow me to apply any voltages under 0.775V, which would be nice for adding a low-power-state for idling.
Has anyone tried to undervolt the NB yet?
I tried it, but it's really hard to find the "real" voltages since AMDMsrTweaker unfortunately doesn't fully support Carrizo.
So after a few crashes i gave up.
Is it worth it after all, how much power does the NB usually draw under full load?