Your pc seems to have good specs.... should not have any issues dropping FPS... especially in TF2.
Memory leak perhaps, do a memory scan to see if its gone to shit, also check hard drive health, and check for malware/spyware.
A clean windows install always helps too, process of elimination my dude.
| BenQ XL2420T 24" 120Hz | Ducky Shine III 9008 White LED - Brown MX | Logitech G9x |
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| SLI eVGA 4GB GTX980 ACX SC | Vengeance 16GB RAM 1600 DDR3 | AX850w PSU | Samsung 840Pro 128GB SSD | WD Black 1TB HD |
