Antivist

Yep. Just make sure all screws are tightened as much as you can do. Don't use a drill or something, though.

As other people have said, swap the thermal paste as a first step. I got surprisingly good results swapping the paste on my newish RX480's with Thermal Grizzly Cryonaught so i suspect you will see improvements swapping out the older thermal paste on the GTX590 as a first atempt

I've been dealing with some older cards that like to run hot like the Radeon 7000 series and I've managed to get them into a better shape by usually replacing the thermal paste & the thermal pads. But make sure the pads are the same thickness as the ones already on the card! Also while you are taking the card apart, get a can of compressed air and make sure to clean it up as much as possible and get all of the dust out. Double check if all of the fans are working well because there might be some fans that are straight up not working or slogging behind the other fans.

Ah just ship it to this guy so he can blow it up
 

Arctic made an accelero for the 690, idk if that might work for the 590. OP could also just mount two AIOs with some zipties.

Was it free?

Maybe try to find an older water block for the card.

Otherwise just mount it on your wall or disable one of the GPUs.

Dunno if you can use a modern AIO kit and just mount 2 of them to it
 
But any extra work/money simply isn't worth it.
 
He would have to buy 2 and them somehow mount both of them.

New TP will show at least minimal improvement if its the stock TP your replacing, its an older card so i would defenitely do it regardless. 

its old card, you can try replacing the thermal paste etc

If replacing the thermal paste doesn't really improve much, you can probably get an arctic Accelero for it.
https://www.arctic.ac/us_en/products/cooling/vga.html
Depends on how much you're willing to put into it.

Yeah I haven't seen many old cases that were that great. The best one I had experience with was an Antec 900. That was an amazing case with great airflow and cable management, but unfortunately it's too big and about double what I was wanting to spend lol.

I have installed DDR3 1600 MHz into an OEM socket 1366 board and the clocks default to 1033 MHz. Your motherboard has XMP support, just enable it and you should be able to get up to 2000 MHz (if the kit is rated for it). Be sure to choose a RAM kit from the official QVL from ASUS if you want guaranteed compatability. https://www.asus.com/Motherboards/P6X58DE/HelpDesk_QVL/

I had 12gb of ddr3-1600 running with my i7-920. Worked fine, no issues, on a ga-x58a-ud3r board from Gigabyte. Since it's triple channel, I'm not sure how much you lose by dropping down a few speed tiers, but it shouldn't be much more expensive - if at all - to get ddr3-1600 modules.
 
Just remember to get them in threes to ensure triple channel works. My board supported up to 24GB with 6x4GB sticks, although i used 6x2 for 12GB, so finding the right capacity shouldn't be an issue. I wouldn't recommend buying 8GB dims though as I'm unsure how many first gen x58 systems supported them.

It depends on what you're looking for, it's not like this will be a crazy performer anyway...

Isn't the 590 a sandy bridge era card?
 
As for ram, for higher speed you'll have to use xmp

I was looking into one but most of the ones I see are kinda pricey. I actually got a line on a $50 760 so I may go that route. But I think if I can I'll get one of those thanks for the suggestion!
 

It will say for the fitting, if you look in the description it does say its for soft tubing. I don't know if you're particularly attached to XSPC, but I picked stuff that were still the same brand. It's important to note that for xspc you must use xspc tube with xspc fittings, and that is generally a good rule for any company (if you get primochill tubes, get primochill fittings, etc).
 
Shopping list
 
With respect to drain system, you have to build it yourself using the above components youself, see mine below. Since XSPC stuff seem to be all female-to-female, you will need to use 2 male-to-male fittings to make it work. Also you need a stop plug, one soft tubing compression fitting, and some tubing to make your life easier when you actually come to do it.

 
If you want white opaque fluid, then Mayhems pastel is basically your only option. I personally don't like them, but I believe for opaque fluids they're the better one of the lot. Silver kill coil and dyes are not very effective and I would discourage you heavily from doing so.
 

You'l need 2 more fittings, but you need to make your mind up on whether you want hard or soft tubing. You've selected fittings for soft tube but your basket contains hard tbing.
 
You need to go for a different compression fitting for hard line. and also need bending tools (silicon insert and a heat gun)
 
You should also plan for a drain with a t splitter and a ball valve and a dual rotary male to male fitting.
 
You should also get a coolant like EKcryofuel.

you need 6 fittings (currently only 4), some fans unless you already have enough. 
 
you also need a way to bend the PETG, or might be better to go with soft tubing if this is your first loop.
 

I remember that video, but I've seen a lot of people using both in the same system for mining since it's not SLI or Crossfire. The odd thing is that it's not even Geforce Experience because I can't even install it. There's absolutely no detection of the NVIDIA GPU's going on whatsoever. And then when I tried putting just the single 970 without any trace of AMD on there it did the same thing. 

Wouldn't really recommend it for the following reasons:
- You'd void the crap out of your warranty
- The radiator of the waterforce AIO is aluminium, and therefore your waterblock has been in a "mixed-metal" environment and therefore may cause problems down the line
- Custom water fittings are almost always G1/4", no such fittings are present on the AIO and so may be leak prone
- The pump is mounted on the GPU block, and so in a custom loop setup, you'll likely have an overstrained pump (if you put a more powerful pump in front)

The first monitor you linked (the C27FG70) is a 1080p monitor.
 
The Dell is a decent pick.