Frame rates plummeting, possible connection with sound settings

Very suddenly two or three days ago my Gmod began randomly plummeting frame wise. I don’t mean from 60 to 15, I’m talking 60 frames to one frame every five seconds.

With some preliminary troubleshooting I realized that sometimes Gmod would run correctly. At night, I switch from 5.1 surround sound to 2 speakers using Realteck HD Audio Manager to ensure I don’t lose sound when using headphones.

I loaded up Gmod today and experienced show stopping frame drops, and tried changing the in game audio from 5.1 to 2 speakers. This greatly improved frames, and became quasi playable. I exited my music program in the background (Windows Media Player, not sure which version) which further improved frames. After a few minutes and some prop spawns, the inherit instability this issue seems to have fostered got the best of Gmod, and forced it to close despite my alterations to the sound settings.

The last thing I worked on in Gmod is in this thread, the issue happened a week or so after this fix was working perfectly, which leads me to believe it is not related. Here is the related thread.

Here is a picture of my Gmod Addons:

Computer specs:

OS: Running Windows 7 64bit, probably the home edition.

MoBo: EVGA 132-CK-NF78-A1 LGA 775 NVIDIA nForce 780i SLI ATX Intel Motherboard.

Video Card: EVGA 896-P3-1260-AR GeForce GTX 260 896MB 448-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card.

Processor: Intel Core 2 Duo E8400 Wolfdale 3.0GHz LGA 775 65W Dual-Core Processor BX80570E8400.

RAM: G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model F2-6400CL5D-4GBPQ.

HDD: Seagate Barracuda 7200.10 ST3250410AS 250GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive

Heat Sink: Tuniq Tower 120 Universal CPU Cooler 120mm Cooling Fan and Fan Controller/Heatsink.

Case: (Like it matters} Antec 900.

Using onboard sound, Realteck with recently updated drivers. This computer was reformatted less than a month ago so drivers should be current.

Thank you for your time and consideration/