Several readers commented on the lack of 2.5" SATA drives in our SM951 coverage. Comparing SATA to PCIe-based storage isn't apples-to-apples. I tend to make comparisons based on interface technology or price tag. Samsung's 850 Pro is a very fast 2.5" SATA SSD, but it's not in the same league as the company's SM951.
Don't believe me? In this round-up of Samsung products, I'm pitting the 850 Pro 256GB against Samsung's SM951 AHCI 256GB. I'll also introduce you to the SM951-NVMe 256GB, which should be available in June.
At this time, only the 256GB model is available from Samsung's SM951-NVMe product family. Some sites published reviews of the SM951-NVMe already using drives harvested from Intel NUCs. But we've learned that Intel's samples didn't ship with final releases firmware. As a result, we shelved our early review using one of those SSDs borrowed from a NUC.
Intel wasn't the only company to receive early SM951-NVMe SSDs. At least one distributor had products in-hand, ready to ship before Samsung asked for them back to update the firmware. If that firmware wasn't required, the SM951-NVMe would already be on sale.
If it only resulted in an extra 10% on a real-world test, then it wouldn't make any sense to spend double or more on a NVMe drive. With these solid numbers, though, the massive performance leap will be well worth the cost for those who can afford it.
I wish you guys would of compared this NVMe SSD to the Intel NVMe SSD that just came out.
All three drives were tested in the PCIe test system. They are the only systems setup for testing queue depths beyond 32.