The only CPU that would offer ANY amount of performance gain worth spending money on, without changing platforms, would be the 7700k, and that would absolutely not be worth spending the several hundred dollars it would cost either for that matter.
There is really nothing on your current platform (motherboard) that you can upgrade to that is going to give you a significant enough performance increase that it would justify spending the money. Besides which, your CPU should be PLENTY for that 1660 ti unless you are looking at some light eSports game where you are trying to get 200 bazilliony FPS and running low settings, and the CPU can't keep up.
One option would be to do something like this, which would probably put you where you need to be and would be much better than any upgrade you can do on that platform. You could simply move your RAM to this system and you may not even need to do a clean install of Windows, but it WOULD be highly recommended that you do so, so keep that in mind as well since you WILL be changing chipsets in the upgrade if you went this way. and don't let the 2.9Ghz base clock fool you. That 10400F has two more cores with four additional threads, than what your current CPU has, and when under a load it pretty much lives at 4Ghz under all core boost conditions plus it has moderately better IPC and single core performance than your current CPU. It's an option anyhow. For about 350 bucks, you could get a MUCH more capable CPU and motherboard.
PCPartPicker Part List
CPU: Intel Core i5-10400F 2.9 GHz 6-Core Processor ($167.07 @ Amazon)
Motherboard: ASRock B460M Pro4 Micro ATX LGA1200 Motherboard ($90.99 @ Amazon)
Total: $258.06
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2020-11-04 23:11 EST-0500
Also, it would be REALLY GOOD to know what the EXACT model or at least what series and brand, your power supply is. If you are unsure, check. It will be printed on a label or directly on one of the sides of your power supply.
But before you even consider something like that, I think it would be wise to try ALL of these, first, because your CPU should be capable enough for anything that graphics card can handle. I'm still rocking a 6700k with an RTX 2060, and I don't have any such problems. Keep in mind as well, that Watch dogs has ALWAYS been a very poorly optimized game with a lot of bugs, so checking for patches for that game code itself is a good idea as well.
If there are any steps listed here that you have not already done, it would be advisable to do so if for no other reason than to be able to say you've already done it and eliminate that possibility.
First,
Make sure your motherboard has the MOST recent BIOS version installed. If it does not, then update. This solves a high number of issues even in cases where the release that is newer than yours makes no mention of improving graphics card or other hardware compatibility. They do not list every change they have made when they post a new BIOS release.
Second,
Go to the product page for your motherboard on the manufacturer website. Download and install the latest driver versions for the chipset, storage controllers, audio and network adapters. Do not skip installing a newer driver just because you think it is not relevant to the problem you are having. The drivers for one device can often affect ALL other devices and a questionable driver release can cause instability in the OS itself. They don't release new drivers just for fun. If there is a new driver release for a component, there is a good reason for it. The same goes for BIOS updates. When it comes to the chipset drivers, if your motherboard manufacturer lists a chipset driver that is newer than what the chipset developer (Intel or AMD, for our purposes) lists, then use that one. If Intel (Or AMD) shows a chipset driver version that is newer than what is available from the motherboard product page, then use that one. Always use the newest chipset driver that you can get and always use ONLY the chipset drivers available from either the motherboard manufacturer, AMD or Intel.
IF you have other hardware installed or attached to the system that are not a part of the systems covered by the motherboard drivers, then go to the support page for THAT component and check to see if there are newer drivers available for that as well. If there are, install them.
Third,
Make sure your memory is running at the correct advertised speed in the BIOS. This may require that you set the memory to run at the XMP profile settings. Also, make sure you have the memory installed in the correct slots and that they are running in dual channel which you can check by installing CPU-Z and checking the Memory and SPD tabs. For all modern motherboards that are dual channel memory architectures, from the last ten years at least, if you have two sticks installed they should be in the A2 (Called DDR4_1 on some boards) or B2 (Called DDR4_2 on some boards) which are ALWAYS the SECOND and FOURTH slots over from the CPU socket, counting TOWARDS the edge of the motherboard EXCEPT on boards that only have two memory slots total. In that case, if you have two modules it's not rocket science, but if you have only one, then install it in the A1 or DDR4_1 slot.
Fourth (And often tied for most important along with an up-to-date motherboard BIOS),
A clean install of the graphics card drivers. Regardless of whether you "already installed the newest drivers" for your graphics card or not, it is OFTEN a good idea to do a CLEAN install of the graphics card drivers. Just installing over the old drivers OR trying to use what Nvidia and AMD consider a clean install is not good enough and does not usually give the same result as using the Display Driver Uninstaller utility. This has a very high success rate and is always worth a shot.
If you have had both Nvidia and AMD cards installed at any point on that operating system then you will want to run the DDU twice. Once for the old card drivers (ie, Nvidia or AMD) and again for the currently installed graphics card drivers (ie, AMD or Nvidia). So if you had an Nvidia card at some point in the past, run it first for Nvidia and then after that is complete, run it again for AMD if you currently have an AMD card installed.
Graphics card driver CLEAN install guide using the Wagnard tools DDU
And last, but not least, if you have never done a CLEAN install of Windows, or have upgraded from an older version to Windows 10, or have been through several spring or fall major Windows updates, it might be a very good idea to consider doing a clean install of Windows if none of these other solutions has helped. IF you are using a Windows installation from a previous system and you didn't do a clean install of Windows after building the new system, then it's 99.99% likely that you NEED to do a CLEAN install before trying any other solutions.
How to do a CLEAN installation of Windows 10, the RIGHT way
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