gourimoko
Fighting the good fight!
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So some questions regarding SSD:
I've heard that there's an issue with them possibly being, "overwritten too often," and I've heard suggestions from two sources now that I should only run my operating system on it. Is that true?
This was true only for the first generation of SSDs.. It's no longer an area of concern. Suffice it to say, commercial SSDs have a lifespan of roughly 5 years. Server SSDs (which use a different type of memory) have a lifespan generally higher than 10. This doesn't mean they will simply shut down, but it does mean you may begin to notice performance degradation after 5 years.
Modern operating systems compensate for many of the issues with SSD technology using the TRIM protocol. It's just not something you need to worry about.
Also, buying an SSD only for your operating system is an organizational nightmare. It's silly. Buy one that is at least 128GB, but preferably 240-256GB in size in a 2.5" form factor. The reason you want a larger SSD is because they way they are constructed, organizationally, a larger SSD usually will have more memory units to access, rather than just larger memory units; meaning larger SSDs (unlike HDDs) are generally faster than their smaller counterparts.
240-256GB is usually the sweet spot for price/performance, and that's more than enough space for your games and operating system.
The absolute best SSD on the market is the Samsung 840 EVO, which is one of the fastest and most stable SSDs you can buy.
You'll spend $90 for 120GB, and $140 for 240GB. Get the 240GB model.
To answer your other questions:
1) SSD uses a storage technology more akin to Flash RAM you'd find in a USB memory stick than the magnetically charged sectors of a spinning disk (hard drive). It was thought to be a fad, but it is now becoming the industry standard, even in servers. Not having an SSD is generally a bad thing.
2) Hybrid drives combine smaller SSDs with larger traditional HDDs, using the faster SSD space as cache storage. For many common operations, hybrid drives can perform comparable with SSDs if their components are well configured; however, once system demand is high enough, or on every cache-miss, the drives will actually perform slightly slower than even standard hard disks. I generally recommend hybrid drives over standard hard disks, but not over SSDs.
Understand though that you will not get any FPS or performance boost by way of using an SSD. It will improve load times, and that's it. Not in-game performance.