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For my next rig I want to do 1080ti's. Is a single 4GB of RAM enough or do you guys say, better safe than sorry, go for 8GB atleast?

try 4GB at first,  if it doesn't work well, add another 4GB.

Thanks car1999 for the quick response, will try that when it arrives:)

Are you using Windows or linux?  If its Windows definitely get 8 GB.  I have a single 16 GB module in my machine.  If nothing else its a good future proofing.

I use 4gb on my rig with 8 x rx 470.

I use 4GB on my 5x 1080ti rigs. Virtual memory 30GB, since there's spare space. No issues thus far.

I have several 1080TI rigs on Windows 10 and 4 GB is plenty. Running just the miner only uses 1.7 GB when reviewing in Task Manager. I have looked at this with 4 and 8 GB installed and the amount used does not change, which is what you would expect of course but sometimes Windows is weird with its memory management.

Another thing you can do if you are still worried is increase your swap file size, Claymore recommends 16 GB when running his software although I never seen it use that much even when initializing. However, by doing this you would bring the total usable memory by the system to around 20GB (I say around because again Windows, it will be 19.xx something).

Are you here to raise postcount? I am saying it's 1080ti not rx470, they are not to be compared.

Now this was the answer I was looking for!!! Thanks a lot. Great answer. This I can actually work with. Howmuch is ''several 1080ti's'', though? Anyway, this is a real answer that I was looking for. I was about to say I will be using mostly Claymore as well and Skunk.  ;)

It's Windows, but I assume you also use it for gaming? A 16 GB single module wouldn't make sense ROI wise whilst not gaming or am I missing something?

I was thinking of getting a 1080ti for a rig aswell everything that I have read say that it would be a good start I was leaning towards 8gb too. How many are you planning to run?

The largest 1080TI rig I run has 6x cards, the smallest 4x cards. All of them use < 2 GB RAM when mining, and most of that is actually reserved by Windows as the actual miner software itself is only utilizing a few hundred K of memory. Of course you do need Windows and drivers, etc loaded into memory too, so sticking with the ~ 2 GB figure seems pretty accurate, meaning a 4GB stick is plenty. Again with virtual memory (swap file) set to an appropriate size you are covered in any event.

Update, I also verified when mining Signatum (Skunk) that memory does not increase at all, stays right around that same 1.7 GB number. I also watched as Claymore initialized and generated the DAGs, no appreciable difference in system memory utilization, again I stand by my 4 GB is plenty recommendation.