Computer might be overheating.
Install speccy, run it when you game. When you have drops, alt-tab and look at the temps.

why dont you just play on dx8 if you cant get over 60 with dx9?

nop, pretty much consistent

http://gyazo.com/f452372639bc3b48550cf3eb4903aa65

i am using dx8. however, i still get those drops down to 50, and thats the main problem for me.

sure, i dont realy get why my pc with those specs cant run tf2 in dx9, my main priority however is to get rid of those drops to 50

when do these drops happen? at any specific time in the game?(pushes, mids, etc)

i'm still trying to figure that out. i havnt found any consistency yet.

for example, i "stress tested" it in a 32 people hightower pub. first time i only had problems in a specific map area and only when i was looking at specific things (in this case outside spawn looking in the direction of the other spawn), next time i tried it (the next day after restarting the pc) i couldnt find any fps drops at all (again 32 people hightower). right after that i joined a viaduct lobby and the fps were going down constantly

I dont think its hardware related. Check for driver uptades

thats what i thought at first aswell, but as i said i just bought the pc 1 week ago, so i updated everything right away

try disabling steam overlay
mine crashes every now and then and my fps gets locked to like 50 until it comes good

What are your PC power settings?

Only thing I can think of if it's not temp related is you have your CPU going from 5-100% of it's clock speed like the default power settings suggest. When you want 100% at all times if you want max frames.

powersettings are on maximum preformance

check your autoexec config make sure nothings wrong with it.

power supply?

other than that I don't really see why your comp would be acting up like this.

Actually their's one more thing.

Did you install 2 different GPUs
ex1. you had 1 used it for a week waiting for the new one to come in
ex2. you had a new gpu that was partially defective and RMA'd it and got a different model
ex3. you installed a really old series of drivers and then installed the newest one

if you did any of those it's possible driver conflicts could be happening. (had the issue with bf4 myself when I upgraded to a new gpu)

and just to be 100% sure, you're using the dedicated GPU display ports (dvi/vga/hdmi/dp) and not the CPU based ones.

it could be that i have conflicts between drivers (i had the automatic windows updated driver installed first and then manualy got the newest one after that), also its not a custom build pc, i bought it as it is so there were a few things already installed on it. is there any way to check if that could be the problem or a way to solve it without rebooting windows? (parden my lack of software related knowledge, i swear i know other things :3 )

i use display port for my primary and hdmi for my secondary monitor

btw, i checked other games aswell and is not just tf2 (i had to reduce the textures in risen 1 to the minimum to get a good framerate)

my config is fine. i scriped a lot of it myself, but some of my friends use it/i used it on my old pc and it was fine.

about the powersupply: its a desctop pc, so.. ^^ but thanks anyway! :)

Why do you want to avoid rebooting? Are you confusing rebooting and reinstalling or did you never reboot since you got that pc?

About Risen 1: I'm sorry but that's just your GPU being shit.

Just because other people use that config doesn't mean it's good.
Just because it worked on a different pc doesn't mean it's good or will work on this one.
Especially since you wrote it yourself.

I'm not sure what that's supposed to mean.

u got a bad day or something? im not forcing you to help me or read this post ^^

anyway, i ment reinstalling everything, like reinstalling windows. sry if rebooting wasnt the correct term

"About Risen 1: I'm sorry but that's just your GPU being shit." ok, if you say so. i dont agree, but ok ^^

about my config: i alternated it myself, i didnt completely write it myself. my base still is christ max fps config.

and again, im not forcing you to try to help me or read this post. im glad for every help that i get but thats no reason for me to take someone elses shit, no offence :)

Nah, I'm just curious what you meant with the PSU. I'm 90% sure #13 wanted to know the model/age.
I'd really like to know what "its a desctop pc, so.. ^^" was supposed to mean, that it's got a PSU?

There's nothing to agree or disagree about on the GPU. It's low end and that's it.
http://www.pcgameshardware.de/screenshots/original/2009/09/Risen-HD5850-1920.png
http://anandtech.com/bench/product/1062?vs=1124
If you wish to disagree with benchmarks then suit yourself. What I was trying to say is "Your GPU is shit, the fps you're getting in Risen are normal and you won't get more no matter what you do. Therefore the only problem remaining are your fps drops in TF2 and that could be config related. Since that particular config has never been tested on the exact same hardware because it's a custom config you can't be sure that it's not the culprit."

I'm sorry if stating facts insulted you, but I'm not even trying to offend you. Off the top of my head I can think of 8 11 better ways I could've done so just in these two posts.

And I still want to know about that PSU...