bepeg4d wrote:Hi markus,
if you are able to render at lower resolution, it sounds not enough RAM to me, but difficult to say without the scene.
How many passes have you enabled?
Maybe not all 48GB are working correctly.
RAM is definitely OK and is also of EEC type. also, i am using other applications like formz, photoshop, lightroom, after effects and never since i bought this mac i had such a shutdown failure or any processor / RAM relates issues. as reported, the first time it started with first release of the plugin with denoiser for lightwave last year. since then i never could render larger images with denoiser without a shut down. the lightwave plugin developer also thought that it could be a core issue. in fact, this happens with the octane app as well, so it is probably not even plugin related. it also is not network dependent and it also happens on all my other similar equipped macs. i also tested a few times on the hp workstation - which also has 48G RAM (and runs windows 7 pro) and in this case octane crashed (but at least i didn't get cold shutdown). all machines have nvidia 980ti cards.
i ususally kept denoiser settings at default and tried both denoising during rendering and at end of frame. in both cases machine shuts down immediately when denoising process runs. usually i render with PT to some 1000 - 5000 final samples.
apple macpro 5,1 with nvidia gtx 980ti, 48G RAM, 2 x 2,66 GHz 6-core intel xeon/ mac os 10.13.6 + networked hp workstation with 48G RAM, netstor GPU box, 5 x nvidia gtx 980ti / windows 7 pro