I received 2 of these cards the day OWC made them available.
FWIW my benchmarking was in the ballpark of the published MPG numbers but not identical.
I have them both installed on a 2010 MacPro. They worked fine on SL & now on Lion.
Downside: I cold not get Lion to install on a RAID-0 config of both drives. The install barfed.
Instead, I partitioned both cards to give me ~80GB boot partition on 1 card, another ~80GB partition on the other card and then I created a stripe-0 volume across the other ~40GB partitions on each card giving me 3 ~80GB partitions.
Here's the numbers for both the ~80GB scratch disk & the ~80GB RAID-0 partition:-
>>>>
Using test size of 2GB, 4MB at a time at start (0%), within a 72.0GB test file.
Iteration 1: writing…673MB/sec, reading…685MB/sec
Iteration 2: writing…662MB/sec, reading…686MB/sec
Iteration 3: writing…670MB/sec, reading…684MB/sec
Iteration 4: writing…671MB/sec, reading…688MB/sec
Iteration 5: writing…670MB/sec, reading…688MB/sec
Monday, May 28, 2012 3:12:33 PM Pacific Daylight Time, volume "Accelsior-Single" (74.4GB)
------------ Averages for "Accelsior-Single" (2GB/4MB, 5 iterations) -----------
Iteration Write MB/sec Read MB/sec
1 673 685
2 662 686
3 670 684
4 671 688
5 670 688
Slowest 662 684
Fastest 673 688
Average 669 686
Median 670 686
Range 11.7 4.49
Command "run-sequential" executed in 31.00 seconds on Monday, May 28, 2012 3:13:04 PM Pacific Daylight Time
Using test size of 2GB, 4MB at a time at start (0%), within a 71.2GB test file.
Iteration 1: writing…1234MB/sec, reading…1269MB/sec
Iteration 2: writing…1184MB/sec, reading…1265MB/sec
Iteration 3: writing…1182MB/sec, reading…1288MB/sec
Iteration 4: writing…1172MB/sec, reading…1267MB/sec
Iteration 5: writing…1171MB/sec, reading…1276MB/sec
Monday, May 28, 2012 3:13:18 PM Pacific Daylight Time, volume "Accelsior-RAID" (73.6GB)
------------- Averages for "Accelsior-RAID" (2GB/4MB, 5 iterations) ------------
Iteration Write MB/sec Read MB/sec
1 1234 1269
2 1184 1265
3 1182 1288
4 1172 1267
5 1171 1276
Slowest 1171 1265
Fastest 1234 1288
Average 1189 1273
Median 1182 1269
Range 63.6 22.1
Command "run-sequential" executed in 17.10 seconds on Monday, May 28, 2012 3:13:35 PM Pacific Daylight Time
>>>>
You can see that RAIDing these cards boosts your "full-performance" very nicely... almost twice as fast.
One other thing, contrary to other posts, I am able to boot from a separate SSD into Windows just fine... except it takes 7.5 minutes to boot. Once booted Windows runs fine. Boot time for OS X also increases when the Accelsior cards are installed (just like other PCIe SSD cards).
I expect a third Accelsior would boost "full-performance" higher... MPG posted a few details on there findings, but not until after I tested it for myself by RAIDing 2 Accelsiors with an OCZ Revo Drive (also a PCIe card).
My results again were in the ball park that MPG posted, but I did get better visibility as to performance ranges that MPG did not publish by using benchmarks available through Windows.
So to answer someone els's Q, no you should not have to physically remove your Accelsior cards in order to boot into Windows from a separate drive.