Some games perform well, other games suffer from FPS drops.

[TechnologicallyUnlucky]

(Heading out to dinner just before posting this.)

Two days ago the cooling pump on my computer died, it was a Corsair H60. I live in Spain so I need a fairly beefy cooling system to be able to run my computer. It was down for two days, Yesterday evening I my H80i V2 arrived in the mail so I quickly installed that, and the computer worked fine and I played League of Legends in the evening.

This morning I decided that I wanted to play some War Thunder so I booted it up, noted I had incredible FPS lag so I quickly went to check again on League to see if I could replicate the FPS problem there, I couldn't. I checked a couple other games, Rust & Stellaris. Rust had the same low FPS as Warthunder but Stellaris only suffered about half of that loss in performance.

Am I right in thinking that I need a stronger PSU? My issue is that I'm using an Alienware Aurora R4 from around 2011, so replacing the PSU would be incredibly difficult.

I can post Specs etc and run diagnostics, I did check to see if the Pump was not cooling the PC enough but its running at 40 Degrees at either Idle or playing games.

 

[Shektron]

Download and run MSI Afterburner, and set up the OSD to show CPU and GPU usage and temps. Run War Thunder again and check your CPU and GPU temps, and also the usages. If your GPU is not being utilized 95-100%, then your CPU is bottlenecking it. If the GPU usage is at 100%, then there's some problem in the GPU.

Most importantly check temps - I don't know if PSU really can cause performance drops(it might, but it's not common), it usually just causes crashes and such.

 

[TechnologicallyUnlucky]

Okay so I downloaded MSI Afterburner, the temperature my other program was telling me was off, it said 51 where as MSI said 91.

I noted this time during Warthunder(what Im using as the bench mark) that the FPS dropped rapidly over about 12 seconds, as opposed to starting off as a instant drop in so I'm inclined to think that, with the evidence, it's a Heat problem.

Any ideas on how to rectify it?

I'm going to switch my fan setup, currently its drawing air out of the case but I was told that it runs cooler when the air is drawn in?
Maybe a big fan on the side of it?

 

[Shektron]

If you have overclocked the CPU, try to reduce the overclock.

Another way to check for throttling due to heat is to run the AIDA64 stress test - if the CPU overheats and throttles, AIDA64 can tell you about it - run the FPU stress test in AIDA64, and check if it says that the CPU is throttling(there'll be a red line on the graph that indicates %age of throttling).