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Left 3x Tesla K80's, right 4x Tesla M40's. Bought as mining experiment, K80's didn't even work, M40's only put out 3 MH/s each. So scrapped and converted into folding rig until better more power efficient cards could be purchased at reasonable prices. The rig on the right will do 4.2 million ppd, about on par with 1660's. Under the noctua is a x399 with 1900x. Left is a delidded 8700k and Asus z390-A. 

Don't forget about the m.2 slots if you want to shove a few more GPUs in the X399 machine. https://extremehw.net/topic/50-post-your-last-purchase/?do=findComment&comment=4205

On 2/19/2021 at 8:07 PM, tictoc said:

Don't forget about the m.2 slots if you want to shove a few more GPUs in the X399 machine. https://extremehw.net/topic/50-post-your-last-purchase/?do=findComment&comment=4205

 

Went ahead and bought 4 M.2. Risers of your recommendation. 

I have a few of them, and they worked great on my X399 board.