25% LONGER render time 32gb vs 16gb ram

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Speed Grapher

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  • Joined: Sun Dec 20, 2020 2:09 pm
  • Real Name: Simon Okrogar

25% LONGER render time 32gb vs 16gb ram

PostSun Dec 20, 2020 2:37 pm

Hello all, first let me just say that I don't know if this is an issue with the 17 Beta version that I am using or also with the version 16.

Image
Context of the image is described below.

I made a video edit ~35m long and rendered it on my PC with 16gb of ram which needed around 20m minutes. I've rendered it a few times because I did some tweaks here and there but the render time didn't change significantly.

I then upgraded my ram to 32GB and rendered the same edit a couple of time and it took 5 to 7 minutes longer, which doesn't make any sense to me.


System specs (16GB):
MSI B350 Tomahawk motherboard
MSI GTX 1060 6GB (OCed memory and speed)
AMD Ryzen 5 2600 @4GHz OC
Kingston A2000 1TB m.2 nvme scratch drive (runs at about 1500MB/s read/write)
Water cooling CPU and GPU, so thermals shouldn't be an issue
Memory (2x8) 16GB DDR4 G.Skill Trident Z rated @2400MHz (OCed to 3200MHz and custom timings)

When adding extra ram (2x8) for a total of (32GB)
16GB DDR4 G.Skill Trident Z rated @3200MHz (OCed by applying different custom timings than when using 2 sticks in order for all 4 sticks to be able to run)


So my question is, did anyone experience something similar? Is this a known "issue" and is this how it's actually supposed to work? I know that he CPU uses more bandwith to communicate with the RAM but 25% increased render time is quite a lot, and no I didn't have any fancy fusion compositions (just some text and images nothing fancy). Is this an issue with davinci resolve or maybe the ryzen system itself?
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Peter Chamberlain

Blackmagic Design

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Re: 25% LONGER render time 32gb vs 16gb ram

PostMon Dec 21, 2020 7:44 am

Sound like a ram /bios config issue.
Resolve won’t be slower if u add more ram.
DaVinci Resolve Product Manager

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