Futuremark's PCMark 7: Secondary Storage Suite
PCMark 7 uses the same trace-based technology as our Storage Bench v1.0 for its storage suite testing. It employs a geometric mean scoring system to generate a composite, so we end up with PCMarks instead of a megabytes per second. One-thousand points separate the top and bottom, but that encompasses a far larger difference than the score alone indicates.
PCMark 7 is a vast improvement over the older PCMark Vantage, at least for SSD benchmarking. The storage suite is composed of several small traces. At the end, the geometric mean of those scores is scaled with a number representing the test system's speed. The scores generated are much different from PCMark Vantage, and many manufacturers are predisposed to dislike it for that reason. It's hard to figure out how PCMark 7 "works" because it uses a sliding scale to generate scores. Still, it represents one of the best canned benchmarks for storage, and if nothing else, it helps reinforce the idea that the differences in modern SSD performance don't necessarily amount to a better user experience in average consumer workloads.
This test's storage benchmarks use Intel's IPEAK trace testing to evaluate performance over several scenarios. Representatives from several manufacturers have told us that PCMark 7 does a good job portraying average user workloads, which include things like media consumption and system maintenance.

The composite scores we're generating are pretty similar for most of the faster SSDs. In terms of percentage difference, the deltas are miniscule.
OCZ's Vector flagship and Plextor's M5 Pro sit at the head of the class, though all three Extreme IIs are in hot pursuit. They don't quite make it, but the 120 GB drive is around 2% behind; that's not much at all.
Futuremark's PCMark Vantage: Hard Drive Suite
PCMark's Vantage isn't the paragon of SSD testing, mainly just because it's old and wasn't designed for the massive performance solid-state technology enables. Intended to exploit the new features in Windows Vista, Vantage was certainly at the forefront of consumer storage benching at the time. Vantage works by taking the geometric mean of composite storage scores and then scaling them a lot like PCMark 7 does. But in Vantage's case, this scaling is achieved by arbitrarily multiplying the geometric sub-score mean by 214.65. That scaling factor is supposed to represent an average test system of the day (a system that's now close to a decade behind the times). PCMark 7 improves on this by creating a unique system-dependent scaling factor and newer trace technology. Why bother including this metric, then? A lot of folks prefer Vantage in spite of or because of the cartoonish scores and widespread adoption.

It'd be hyperbole to say that SanDisk crushes its competition, but the 240 GB Extreme II takes first place, the 480 GB model takes third, and the 120 GB version gets an honorable mention in fourth.
We'll single out that 120 GB repository again, even if high Vantage scores aren't really the best indicator of performance. Smaller amounts of transferred data over smaller LBA spaces seemingly play right into the nCache scheme's strengths.
- Extreme II, The Sequel From SanDisk
- A Guided Tour Of SanDisk's Extreme II
- Test Setup And Benchmarks
- Results: Sequential Performance
- Results: Random Performance
- Results: Tom's Storage Bench
- Results: PCMark Vantage And PCMark 7
- Results: Power Consumption
- Not Extreme To The Second Power, But Close Enough
Also, you appear to have put one of the labels back on the wrong way round.
http://www.tomshardware.com/reviews/vertex-450-256gb-review,3517.html
See here: http://www.anandtech.com/show/7006/sandisk-extreme-ii-review-480gb
It's Anand's new favorite SSD, and based on the results, I'm inclined to agree.
It's peak performance is right up there with the 840 Pro, but what's really extreme is the drive's consistency. It's performance when the drive is close to full is unmatched.
There are no high peaks accompanied by low valleys in performance when it comes to the Extreme II. It's pretty much smooth and fast sailing all the time, which in my book, places the Extreme II a step above the 840 Pro. The 840 Pro would have to be at least $30 cheaper than the Extreme II for me to even consider it over the Extreme II.
The "Heavy hitters" for modern SSDs include the fastest SSDs on the market right now, which are The Plextor M5 pro Xtreme, the OCZ Vector and Samsung 840 pro. Of these, you have only included the OCZ, and the slower version of the Plextor. Also, you have also included the old Crucial m4, which is a good drive, but old, and not one of the heavyweights now. At least include the improved "M500" version. I also find it confusing why you include the older Samsung 830.
These are minor points though. Thank you for the great comparison. I look forward to more storage comparisons
that single omission itself made this review critically flawed.
Thanks,
Chris
What we are seeing is stagnation. We have a great Marvell controller, Indilinx Barefoot 2 controllwer and a solide Sandforce 2000 series controllered SSDs.
I'm waiting for the next generation, maybe for the Sandforce/LSI 3000 series controllers that can do 200,000 IOPS! Google it. Though that drive was using a PCIe 4x interface rather than SATA but it was in the 2.5" drive form factor.
Maybe increase queue depth of 1 4KB random reads and write speeds too. So far I've only seen as high as about 30MB/s 4K random read with a queue depth of 1 on Crystaldisk Mark.