Pclynn :
a message popped up saying I was out of space on my SSD. However, once I close the game the space returns, leaving me with anywhere between 3Gb to 8Gb of empty space. What would be the solution to stopping this?
Get a bigger SSD, or move unnecessary stuff off the SSD.
SSDs cannot overwrite a 1 with a 0 or a 0 with a 1. They have to go through an intermediate erase step first. 0->erased->1, or 1->erased->0. The erased->x step is blazing fast. The x->erased step is really slow, sometimes slower than a HDD. So the SSD will erase deleted space in the background while it's idle, maximizing the amount of space that's ready to be written to at blazing speeds. That's why TRIM is so important - it's how the OS tells the SSD which files have been deleted, so the flash memory is safe to erase.
So for a SSD to retain its high write speeds, it needs to have enough empty space for you to have a a good sized buffer pre-erased flash. Generally, this is around 15%-25% of the SSD's capacity. If your drive's free space drops below this amount, you're more likely to encounter slow writes (and reads if you force the SSD to read something while it's busy erasing).
Unless you have a 32 or 64 GB SSD, you are below the recommended amount of free space. Either move files off the SSD to clear up space (delete the hibernate file if you don't use it, reduce amount of space system restore is allowed to use, copy unused games, videos, photos, etc. to the HDD), or get a bigger SSD.
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maxwellmelon :
you need to change your swap file from your ssd to your regular drive.
I'd be really careful doing this, especially on a gaming computer. I've found that some of the lag/freezes in games is caused by the inordinately high priority Windows gives pagefile read/writes. Put it on the slower HDD and you're going to get more of them.