4GB/thread with a 32-core threadripper means a whopping 128GB of RAM in eight sticks of 16GB. Somewhat surprisingly this can be bought -as cheapest solution- in the form of eight sticks of
Corsair Dominator Platinum CMD128GX4M8B2800C14 at € 1.129,- (interngeheugen.com)
If you prefer ECC RAM you can do with four 32GB sticks for around € 1.600 Euro. This might come in handy when future threadrippers will have even more cores...present threadripper mobo's do not support more than 128GB though, IIRC.