GTXMan
EK's 3080/90 FTW3 block fits the Ti.
 
Yes you can get the EK block and Corsair everything else or mix and match if you prefer the aesthetics. I can't name any parts that are still around that use anything but copper (that comes into contact with water at least) so there's no issue with mixing metals. 
 
Frankly I think Corsair's CPU blocks look f'ing ridiculous - like a smiley face. You could use EK or something else for CPU as well and do Corsair for the rest but if you like their CPU blocks too, by all means go for it.
 
Happy to answer any other questions.

Gotspeed_2000
If you are doing this for a first time, the EK stuff for the most part is good.  You should follow the EK thread here about cards being bricked by their product and how to avoid it.  Users here have gone through great lengths to identify the issues and now EK has produced fixes to reduce these bricking issues.  EK stuff is really good overall and widely available.  You can look at amazon or other retailers to find parts.  If you are doing this as a first time and costs are concerning, I would recommend soft tubes due to experience challenges and to reduce the need for additional fittings where the bends/connections could be difficult with hard tubes.  
 
Just as a note, system prep is important in a open loop system.  That along with making sure to buy the correct fittings for the tube sizes you are using is important.  I would strongly recommend making sure to buy fittings and tubes from the same manufacturer to ensure proper fitment.  Also, I'd do a bunch of research on you tube on what others have done when building in your PC case or starting out.  It can help you plan better and prepare you for your loop planning.  Mixture of parts is an issue if you add aluminum so you want to be sure to avoid aluminum if possible.  But more importantly you want to make sure the fittings you use are quality fittings with their plating techniques because those failures will cause issues in your loop.  Most fittings are nickel plated, so how thick and how they plate them will determine how long those fittings last.  Youtube again is a great resource of information.  Just be sure to understand that information shared there can come from a variety of sources, most good, some bad so you'll need to do your own research in addition.  The reputable ones who do open loop are great sources of info.  I like Jayz2cents as he has been doing open loops for quite a while.
 
I just did my first open loop hard tube system recently and did a ton of research.  I still bought a bunch of parts extra in case I needed them due to my open loop system complexity.  In my system I have EK rads and pump/res with Optimus blocks.  For compression fittings and hard tubes I went with Primochill and other fittings from EK.  If I had to do it over again, I would have done the EK tubes and compression fittings instead but I'm fine with what I have done already.  I used youtube alot to figure out what I wanted to do and to plan my system and what my system should be.  Once you figure out a parts list, you can start to get pricing for the parts you want so you can do a budget.  From there you can figure out where and if you need to cut some costs.  I used an excel spread sheet to manage my cost and for my shopping list when ordering parts.  Amazon was a great help with free shipping, but they didn't have everything though.  Amazon, Performance PC in Florida, and NewEgg are places I would use to research parts and costs.  
 
If your budget allows, I would recommend looking at Optimus water cooling for your water blocks for both you CPU and GPU.  I used their blocks and they are great.  The fit and materials are second to none.  Also the CPU block is very good at the price they sell for.  The wait times can get long for them, but I don't regret those purchases one bit.  The GPU block is a bit more pricey, but when you look at what it comes with and the materials it helps justify the cost.  
 
 

irenicus785

GTXMan
EK's 3080/90 FTW3 block fits the Ti.
 
Yes you can get the EK block and Corsair everything else or mix and match if you prefer the aesthetics. I can't name any parts that are still around that use anything but copper (that comes into contact with water at least) so there's no issue with mixing metals. 
 
Frankly I think Corsair's CPU blocks look f'ing ridiculous - like a smiley face. You could use EK or something else for CPU as well and do Corsair for the rest but if you like their CPU blocks too, by all means go for it.
 
Happy to answer any other questions.

LMAO, yes Corsair's CPU block does look a bit weird, haha a bit funny!

2x 280 rads or one 360 rad? EK seems to believe it's best I grab 2x rads.

Cosair recommends 1, but I added 2x 280 (top and bottom) to match EK and it comes up to $810 without GPU block/backplate. Hmmz...

talon951
One thing I'll add is the EK configurator is very optimistic for estimated water temp.  You will never achieve that number without running some crazy 3k rpm fans.  Even dual 280's will not get you great temps without a lot of fan speed.  The best I achieved with a 360 and 280 (both slim) was 10-12C water delta with fairly high fan speeds (1500-2000 rpm, Noctua A12's and Arctic P14's).  This was with a 5800x and 3090 in the loop.  3090 running at 390w.  Going up to 450-500w on the 3090 would push that delta to 15C.  Good enough, but nothing amazing.  

slev21
Hi Irenicus785
 
I am building my first water cooled loop too, I am still waiting on some parts to arrive, here in the Uk there is a shortage/backlog of items, hopefully I won't have to wait much longer for them.
 
I went with Optimus for my 3090 ftw3 block and lga 1200 cpu block, I decided on the EK quantum kinetic tbe d5 pump/reservoir and as Nike has already mentioned I also went with 16/11 zmt tubing but I preferred the EK quantum torque 12/16 fittings so I went with those, Radiators I got two 480mm for the front and two 360mm for the top, all 4 are Thermaltake cl pacific 64mm deep.
With this being my first water build I also needed a 4.0 riser cable + EK leak tester .. so many extra's.
 
I've jumped in at the deep-end but I am enjoying building my new rig, I hope you have lots of fun too with your loop!.
 

safan80
 
If you are just looking for parts to build your own custom loop I suggest you check out https://www.performance-pcs.com/
They are pricey, but they have everything you will need.

Dwarfy
As a first time I'd recommend going for a kit and adding what you need to add say gpu to it, Alphacool do some great stuff and I think corsair do a kit too

kissTheApex
Thanks for all the case recommendations guys. I think the best bet is OD 11XL.

I think I’ll pass on the case until I have the HC card in hand (I may end up with one of two alternatives). For the hybrid, I can just leave the side glass open for now. When case is closed, temps are 58-ish max (max power ~430W), so it’s not like it is horrible.

OP, sorry for the thread side track, since it was related, I thought it would be inline with the general idea.