Never-before-seen write speeds; new controller.
High maximum response time
OCZ has typically reserved its Vertex label for the highest-performing SSDs in a given generation—using synchronous NAND, for example, rather than the asynchronous NAND found in its less expensive Agility series. The 256GB Vertex 4 carries on that tradition, with 16 128Gb IMFT 25nm synchronous NAND packages on a board with 512MB of DDR3 DRAM cache and OCZ’s new Indilinx Everest 2 controller.
It was just a few months ago that OCZ shipped its Octane SSD , which was powered by the first Indilinx Everest controller. Some digging by Anand Lal Shimpi of AnandTech.com revealed that the Everest controller was actually based on Marvell’s 9174 controller—the same one used in drives by Plextor, Intel, Crucial, and more, but with custom Indilinx-engineered firmware that allowed the Octane to outperform earlier Marvell-based drives. The Everest 2 controller, while also based on a Marvell one, is aimed even higher.
The Everest 2 controller in the Vertex 4 is a modified Marvell controller with custom Indilinx firmware.
The Vertex 4’s sequential reads, at 440MB/s in CrystalDiskMark and 460MB/s in AS SSD, are impressive, though Samsung’s 830 and any number of SandForce-based drives hover closer to 500MB/s. Where the Vertex 4 really stands out, though, is in its write speeds: We saw sustained writes of over 450MB/s, which is absurd—50 percent faster than a SandForce-based SSD. We also saw great results in 4KB read and write performance, both single-queued and heavily threaded. Though not included in our benchmark chart, the Vertex 4’s 64-thread 4KB random read and write IOPS (as measured in AS SSD) are over 20,000 IOPS higher than the next-fastest SSDs. Strangely, our Iometer 32QD 4KB random write test didn’t show such a strong performance lead. In fact, at 65,000 IOPS, the Vertex 4 was about a third slower than an SF-2281-based drive. Our Iometer test also highlights a potential weakness in the Everest 2 controller: Its maximum response time during our test was a whopping 285ms. That’s about eight times the lag we’d see from a SandForce-powered drive, though only about half the 429ms maximum response time on OCZ’s Octane drive. Other SSDs based on Marvell controller architecture also have maximum lag times in the 100ms to 500ms range.
Its blazing-fast write performance meant that the Vertex 4 edged out all comers in our Premiere Pro test, albeit by just a few seconds. In PCMark Vantage and 7’s storage suites, the Vertex 4 doesn’t do quite as well as a SandForce drive, but the differences are minimal.
With an MSRP of $350, the 256GB Vertex 4 isn’t as inexpensive as a 240GB SandForce-based SSD, but it’s already under $300 on the street, which is pushing close to the magical dollar-per-gigabyte price point. Frankly we can’t believe how far SSDs have come in the past year alone.
The Vertex 4’s write speeds are truly astounding, and the read speeds are nothing to scoff at, either. We’re happy to see OCZ forging its own path with the Everest 2 controller. Even if it’s not, strictly speaking, new silicon, the magic firmware sauce is working here.
|SanDisk Extreme SSD ||OCZ Vertex 4||Patriot Pyro SE||OCZ Octane||Samsung 830 Series SSD|
|Sustained Read (MB/s)||479.1||440.9||482||445.4||506.4|
|Sustained Write (MB/s)||283.7||446.9||300.3||315.5||398.5|
|AS SSD |
|Seq. Read (MB/s)||503.8||463||506.7||432.2||502.6|
|Seq. Write (MB/s)||278||459.3||295.2||285.9||164.1|
|4KB Read (IOPS)||5,029||6,632||4,986||5,546||5,513|
|4KB Write (IOPS) ||15,244||17,169||14,179||10,417||12,800|
|64KB File Read (MB/s)||490.3||396.7||443.24||408.57||405.85|
|64KB File Write (MB/s)||441.3||470.4||487.9||287.02||515.05|
|4KB Random Write||90,060.8||65,111.06||91,171.26||22,073.97||35,329.48|
|Max Access Time (ms)||30||285||41||429||31|
|Premiere Pro Encode Write (sec)||422||417||424||425||420|
|PCMark Vantage x64 HDD||58,366||41,568||61,686||57,030||62,168|
|PCMark 11 x64 SST||5,282||5,171||5,305||4,945||5,257|
Best scores are bolded. Our current test bed is a 3.1GHz Core i3-2100 processor on an Asus P8 P67 Pro (B3 chipset) running Windows 7 Professional 64-bit. All tests used onboard 6Gb/s SATA ports with latest Intel drivers.