Hello LHA7X and welcome
That looks to be a solid high powered gaming build but...
if you're going to drop cash on a new build such as yours, consider going Intel and NVidia.
9590 vs 4790k - Even though the 4790k is only a quad core cpu and is clocked lower, it still beats the 9590 performance wise and uses much less power. The 4790k has hyperthreading which turns 4 cores into 8 logical cores. You can get the 4790k for a great price here.
http://www.microcenter.com/product/434176/Core_i7-4790K_40GHz_LGA_1150_Boxed_ProcessorFor using three gpu's the only choice is the maximus vi extreme and newegg has a nice rebate on it right now.
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131974&cm_re=vi_extreme-_-13-131-974-_-Prod...Now for the gpu's. I was trying to find the gtx 980 Poseidon in stock but newegg and amazon are out of stock, so I tried to find the evga gtx 980 hydro copper which it is out of stock too ! Since you know what your doing installing the gpu waterblocks you could get the gtx 980 and slap the water blocks on them. These will cost a little more than the 290x's but will be well worth it.
16GB of G.Skill Trident X at 2400Mhz will be plenty for gaming for a good while yet.
You won't need a 1600w psu for three gpu's. Seasonic platinum psu's are high quality and this one would run four gtx 980's.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817151140&cm_re=seasonic-_-17-151-140-_-Produc...You will have a much better gaming machine if you went with this.
Just my suggestion -
🙂
