Liborio

Cablemod extension cables

Yes

The only difference between Type 3 and Type 4 cables is the 24pin motherboard cable. The cables for PCIe, EPS12V (CPU), peripheral, and SATA are compatible between Type 3/Type 4. There's no "Type 4" peripheral/SATA connector it's just Type 3.
 

The coloured dots indicate which type of cables the power supply is compatible with. The RMx column is the one relevant to both your RM750x white and RM1000x.

Mixing cables is fine given that the PSUs have the same pinouts. Given that they're the same series of PSU (not just the same brand), I'd assume that they're the same pinouts, but I'd double check before trying to mix cables

The white RM750x and RM1000x use the same type of cables. All Corsair RMx power supplies use Corsair Type 4 cables. You can mix the cables between those two power supplies.
 
Not all Corsair PSUs use the same cables.
https://www.corsair.com/ww/en/psu-cable-compatibility

I would use the handy trick linus did in a recent video, check cable mod. If they list cables as compatible with both of those PSU’s, your good. If they have cables specific for each, your not good. I believe you should be ok with mixing and matching those, but just confirm to be safe. 

Appreciate your input. Will keep this in mind.

Yes, my mistake.
From a physical standpoint it's plug and play, but you need to clear and install the drivers properly. Although, windows will recognize your GPUs correctly, and they will more or less run properly, You should still Wipe the Drivers, since there will be occasional issues with them otherwise. 
About the 750W PSU though, you could theoretically get away with it, If you had an Athlon.
However with a Ryzen 9 it's different.
It would probably run fine for the most part,(Since while gaming, You'd really be using only one of the cards, and while mining, You wouldn't be using Your CPU, hopefully) but I would advise against using this PSU.

you overclock the memory and lower the power limit to about 80% for efficiency (ive got 4 3060 ti's mining in the basement)

Ah nice. i geuss i don't have that issue since i'm using 2 GLI's? reverse it twice? 😛
(yes i know, why 2? cause i ordered 2 . . . incase it wouldn't work. and yes, an proper XLR mic is still on the wishlist)

I assume you have a dongle? See if you can place it in a different port. Windows will basically reinstall whatever and be like, "oh, you are plugging a new device." Even though it's the same. Maybe that will fix the issue.

I don't own Logitech peripherals (except a webcam), but I would assume you might have access to drivers and/or firmware? If so, see if you can update those (and the G Hub as well. Also, I know that Logitech has different software for the same things, depending on the region. At least, that has been my experience with them. Double check on a Logitech website in a different region just to make sure you have all the software available to you. I use one over the other for my webcam, because one of them isn't all that great lol). Otherwise, I do wonder if you may have to uninstall and reinstall them. If that still doesn't work, you'll have to contact Logitech to see if they are aware of this issue.


 

I see a difference when I have higher pump speeds.  At 50%, Cinebench caused temp to reach 82c.  100% fan speed, the max was 74.5c.

it should fit fine, but you can always email cablemods and ask

My understanding is water speed makes not a lot of difference to AIOs though it stands to reason that in very high heat situations it might.  It becomes a question of noise and what is best for the pump life wise.  Unless the cpu is a 10900k Running hard overclock I don’t see that possibly happening.

Good point. I might just leave it as normal in this case.
 
Thanks for all your help.

They all work, and make minor differences if any.  Do what you think is best for your own mental health

Exactly.  I can’t tell.  I had at first assumed he was talking about radiator fans but that AIO has two fans so the singular makes it confusing.  “Pump fan” could mean the spinny bit in the pump that moves the water.  Which would mean talking about the pump rather than the radiator fans.  It’s more properly called an impeller but is technically a type of fan.  The same type used in vacuum cleaners. If he had said “pump fans” it would have meant radiator fans but this could be either.

what are you talking about here ?     
 
Are you talking about having the Pump running 100%   or the Radiator Fans going 100%   ?
 
The pump you can run at 50%, the radiator fans you can run at 50% as well and only crank them up higher when you're gaming..     You can do this manually or simply set temperature curves that adjust the speeds automatically, can be done for both Pump and Radiator Fans.

I read fan not pump.  you make a point. @Liborio  By” pump fan” do you mean the pump impeller?

With my last 360 AIO cooler I saw almost no temperature difference running the pump at 50% and at 100%...  I've been using AIO's for years and typically would have the pumps running around 50%, and never had a single failure even with "cheap" AIO units.
 
Pump speed matters more when it comes to Custom liquid cooling and even then, not by as much as people would think depending on components and size of the loop.
 
 

There’s usually a ramp setting available.  The cpu has tempature sensors in it and the computer can change the fan speed according to how hot it is.  There are several places this can be done.  The one I happen to be familiar with is bios.  It’s kinda old school.  For that you’ll need to know which port the fans are plugged into.  There are often several options these days though.

The bubbling sound is also in most AIO user manuals asking the users to not worry about the sound as it will go away eventually

No concerns.  You can turn it back to normal if that gives you peace of mind Doesn't change too much.

Less than 10 minutes.  I don't hear anything from mine anymore minutes after I installed mine.  You can help it by tilting the PC case or the tubes so that the air ends up in the radiator and not the pump.  This is typical of all AIO.