Do i have to upgrade something?

Even the most budget of cases are fine, provided they accommodate your components and have adequate cooling. I've never dealt with the Cougar Spike, but it appears to meet your requirements. Might not have the best airflow in the world but provided your temps stay reasonable, the case is totally fine for 1-2+ years.

Pushing the GPU fans 100% of the time will impact the lifespan of the fans themselves, not the GPU chip.
I would recommend avoiding running the GPU fans at 100% if you can avoid it - but you may be limited by the case & airflow.

Luckily (generally speaking) GPU fans are an easy fix yourself. And if you push it hard, with any luck the fans will fail within the warranty period and you can get them replaced for free.

For the GPU? Those are perfectly acceptable temps.

What do your CPU temps look like?

80 is on the high side, but I assume you're running the stock cooler?
Otherwise 30-40 idle and heavy load <70'C you're fine..... your temps are little high, but not dangerous (other than your really high end heavy load).

The only main reasons as to buying a more expensive system case in general Tomatoes come down to a few points.

First better cable management found in more expensive system cases.

The second being how big the case is in respect to it`s dimensions in order to give enough room for expansion cards such as very long graphics card where the length of them may be up to 11.5 inches.

The depth of the case also in order to provide good clean air flow from any system fans, and the amount of system fans that you can fit to the system case.

Plus the amount of storage bays provided for Both SSD drives of 2.5" size and Mechanical drives of 3.5" drives.
And or plenty of room for a custom water cooling loop, or an all in one cpu water cooling loop for the system depending on what size of radiator you opt for for the AIO cpu loop.



Running any fans on any graphics card you have at a higher speed will wear the the fans out quicker when it comes to running them, though it is not strictly related to the system case you have.
It is more to do with, or should I say when keeping the Gpu tempreture of a graphics card keeping the amount of cold air being used to cool it ahead of any heat build up of the aluminium cooling solution fitted to a graphics card.

Every cooler has a Thermal mass limit a point where it can only soak up so much heat due to the surface area it covers or its size.
Where it can no longer soak up the heat and expel it at the same rate of absorption of heat, where the fans come into play.

An each will vary based on how old the graphics card is, and the size of the physical aluminum cooler it has.
By pre setting a fan to a desired and fixed rpm speed for the fans of the card.

You are trying to keep the situation described in balance or a head of the thermal mass buildup of the aluminium cooling solution of the card so the end gpu temp reached is slightly lower.

There is nothing wrong in if you have to removing the side panel of your system case and leaving it off for good.
It will always help to lower the internal tempreture buildup of the case from heat generated from the graphics card and the cpu of the system if air cooling it used, and even helps lower AIO water cooling loop temps by a few degrees.



Back to the case its self, a cheap case will be flimsy and not well thought out, that is where you often find the biggest most headache when it comes to expanding your system at a later date down the line.

In respect to buying a more expensive system case.

I cannot say much more, but when it comes to buying a cheap case vs an expensive one all the pointers are covered above on the potential problems that I presume you were asking in some way as and answer to Cheap system case vs expensive one Tomatoes.