Upgrade advice needed.

[Moinaldo]

Hello, I think I have a descent pc:

i5-2500k @ 4.7GHz (H100i)
16 GB RAM @ 1600MHz
R9-280x Matrix @ 1100MHz
etc

So, the thing is that I've been using eyefinity for some time and I was happy with the performance I was getting in WOW and other games, but I'm having terrible dips below 30fps while inside vehicles in BF4 which is expected with a single card at 5760*1080.

My problem is that where I live is pretty hot, being the average temperature during the day near the 30ºC (86ºF) and that is the reason I can't overclock that much the video card.

I have three options now:
1 - go full water with a custom loop cpu+gpu and hopefully get 5ghz on cpu and 1.3ghz on gpu
2 - buy another 280x to crossfire and bear the inferno temps I will be getting
3 - sell the 280x and go for a single r9-290 on air.

I have a budget near the $500 USD so I can only go with a one of the three options. What would be better for triple monitor gaming?

Thanks in advance.

[chazus]

#2 is probably you're only option. A 290 will not be a huge benefit over a 280x. And going water on your stuff won't help much, since your problem is ambient temps.

[Moinaldo]

Thanks man. I was planning to get one AX360 radiator, a D5 pump and the blocks, although the heat would be at the limit of what a single 360 radiator can dissipate. I guess it should be another 280x and maybe underclock them to 1ghz to get slightly lower temps. Thanks again.