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Yeah, then that Intel 750 is your only option for an SSD that runs at these speeds. The Intel 750 is designed to run in the PCIex4 slot as an "AIC" ("add-in card"...no different than slotting a GPU or sound card into a PCIe slot):
http://www.newegg.com/Product/Product.aspx?Item=N82E16820167359
That's definitely a pricey upgrade alternative to the Samsung 850 EVO 500GB ($150), but it's ~3.5x as fast. I thought it was worth pointing that out when gamers don't think twice about getting that EVO drive at a rate of $300 per TB when the Barracuda 1TB costs $46, and the 850 EVO drives are only ~3x as fast as the Barracuda. Below gives a quick rundown of read speed and cost of the respective drive sizes you're considering purchasing in the latter two (with the Barracuda shown for context):
Nevertheless, if you aren't switching motherboards, then you already have your OS up and running. This is something I would plan for the next OS install with the Samsung m.2 drive on a new motherboard with the appropriate port. By then they should have only become even more economical.
- (165 MB/s) Seagate Barracuda, 3.5" SATA3, 1TB -- $46 ($0.05/GB)
- (496 MB/s) Samsung 850 EVO, 2.5" SATA3, 500GB -- $149 ($0.30/GB)
- (1,741 MB/s) Intel 750, AIC PCIe x4, 400GB -- $330 ($0.83/GB)
Oh, they don't list other system specs like the CPU or RAM, but check out the Samsung NVMe SSD in action on Witcher 3. It's all instant: startup, loading a saved game, fast traveling to a new area. Everything. It's all freaking instant. I saw articles with complaints about 1min+ load times in this game. I fully suspect traditional hard drives are the bottleneck there. Assuming it is: imagine if you pulled a 1min load time on a normal HDD. That might be a mere 3-5 seconds on the Samsung 950 Pro.
I need a little more help. I was digging more into that intel pci-e card and I don't think it would benefit me. I'm crossfired so my only available x4 is 2.0. Wouldn't Sata 6.0 be faster?
Here's the pages from my mobo with slots

