Owc 240gb Mercury Accelsior Pcie Ssd For Mac
The Accelsior is a PCIe 2.0 x2 card. The x2 means that the link width can go up to 2 lanes. Physically, the card can fit into any PCI Express slot that can accept an x2 card. Electrically, the card has 2 PCIe 2.0 lanes.
Each PCIe 2.0 lane can do 500 MB/s so 2 lanes can do 1000 MB/s which is enough to handle the 2 6Gb/s SATA III SSD's in the Accelsior (700 MB/s). All PCIe slots in all Mac Pros can physically accept x16 cards. Electrically, the slots are either x1, x4, x8, or x16. The Mac Pro 2008 has 2 PCIe 2.0 x16 slots (slot 1 and 2). The Accelsior will perform at it's full speed in those slots (PCIe 2.0 x2). Slots 1 and 2 of the Mac Pro 2006 and 2007 are PCIe 1.0 slots. Each lane in a PCIe 1.0 slot can do 250 MB/s.
If you configure the slots to be x8 or x16 using the Expansion Slot Utility, then the Accelsior will do 380 MB/s in those slots (PCIe 1.0 x2). Slots 3 and 4 of the Mac Pro 2006, 2007, and 2008 are PCIe 1.0 slots. However, when you put an x2 card in slot 3 or 4, only 1 lane will be used because the ESB2 south bridge chip that controls those slots will not negotiate 2 lanes.
According to the PCI Express specifications, slots are not required to negotiate a link width of 2 lanes. The Accelsior in slots 3 and 4 only does 195 MB/s (PCIe 1.0 x1).
The card only takes one slot. A PCIe 2.0 slot (such as slot 2 in the Mac Pro 2008) will give you full performance from the Mercury Accelsior. Check About This Mac. More Info.
System Report. PCI Cards - pci1b4b,9230. You should see something like this: pci1b4b,9230: Type: AHCI Controller Driver Installed: Yes MSI: Yes Bus: PCI Slot: Slot-2 Vendor ID: 0x1b4b Device ID: 0x9230 Subsystem Vendor ID: 0x1b4b Subsystem ID: 0x9230 Revision ID: 0x0010 Link Width: x2 Link Speed: 5.0 GT/s If you see Link Speed: 2.5 GT/s then it means you put the card in a PCIe 1.0 slot. If you see Link Width: x1 then it means the slot was not able to negotiate 2 lanes to the Accelsior card.
There are a few minor booting issues I've found with the Accelsior in a Mac Pro 2008 (minor if you don't care about Boot Camp): If I hold option key down during startup to see the Startup Manager, then the Startup Manager will not show the partitions on the Accelsior. This means I can't use Recovery HD from the Accelsior. I need to keep an OS on a normal hard drive for emergencies. I am unable to boot Windows or Linux (using Boot Camp) from a CD/DVD, from a hard drive, or from the Accelsior, while the Accelsior is installed. This means I can only use virtualization software (such as Parallels Desktop) to run Windows.
Owc 240gb Mercury Excelsior Pcie Ssd For Macbook Pro
If I boot rEFIt or rEFInd from the Accelsior, then they will not show partitions from other hard drives. If I boot rEFIt or rEFInd from a hard drive, they will not show partitions on the Accelsior. 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. Not sure what you mean. did your mix of two different cards affect your tests?
I was providing info rather than asking Q's. The test results I quoted were only from: (1) a single Accelsior partition on a single card (2) a single Accelsior RAID-0 volume striped from 2 identical Accelsior cards. I think the test results are within the same ballpark as MPG (actually maybe a bit better than their published results). creaating an array to boot from? Given the far superior results when putting 2 Accelsiors into a RAID-0 config then why wouldn't I try this given OWC claims the cards are bootable. Actually, the Lion installation thought it could do this since it gave a warning that since my boot drive was a RAID config some features wouldnt be available, such as filevault. The installer was still quite happy to waster over an hour with me 'doing the installation' to my Accelsior RAID boot drive, before it decided to declare it failed.
perhaps try with just the two Accelsiors? Try the installation with just the 2 Accelsiors? Thats what did not work, but I got past that limitation. Like I said I got Lion installed using partition #1 of Accelsior #1. I created a SingleAccelsior partition #1 on Accelsior #2.
I created a RAID-0 volume combining both partitions #2 from Accelsior #1 & #2. This all worked and what the performance results I showed represent. Not sure what it is that I should try. The Windows partition that does install is on a separate SSD. I mentioned this since I read in this thread claims that Windows couldnt boot if the Accelsiors were installed & I was informing those posters that it is possible. There are various ways to get Lion on a software RAID.
Owc 240gb Mercury Excelsior Pcie Ssd For Mac Os
It just takes a little extra work. When you create a raid set, Disk Utility automatically adds an AppleBoot partition called 'Boot OS X' to each hard disk. The 'Boot OS X' partition is used to boot OS X when it's installed on a raid set. The only thing left for you to do is to get OS X onto the raid set. The Lion installer sometimes fails at that because of the Recovery HD.
I think the simplest method may be to use Disk Utility's Recover option to copy your existing Lion partition to the raid set. If you use Recover from Disk Utility to copy a Lion partition, it will also try to copy the associated Recovery HD partition as well if it exists. This won't work when the destination partition is a raid set. The workaround is to use Carbon Copy Cloner instead, or temporarily change the partition type of the Recovery HD partition from AppleBoot to AppleHFS using iPartition, gpt fdisk (gdisk or cgdisk ), or gpt. Once the Restore is complete, you can revert the partition type of the Recovery HD back to AppleBoot. The problems I'm having with Boot Camp and the Accelsior probably have to do with the older EFI firmware of the Mac Pro 2008. Apple doesn't make firmware updates for older Macs.
I'm waiting for someone with a 2006, 2007, or 2008 Mac Pro to chime in on Boot Camp issues. I haven't found a solution for running Boot Camp while the Accelsior is installed in my Mac Pro 2008. I also haven't found any other complaints about Boot Camp with the Accelsior SSD either. Actually one person with a Mac Pro 2009 with an Accelsior says it took 15 minutes for Windows to appear but the description of the problem was missing some details. Windows does not appear if I wait 15 minutes or an hour. Another Mac Pro 2009 user has no problem booting Windows from a SATA drive when an Accelsior is installed. OWC has not explicetly confirmed or denied this Boot Camp incompatibility with the old Mac Pros on any website but they did add my user rating/review that mentions the problem to their Accelsior 480 GB page.
Have you purchased the card? What kind of Mac do you have? Microsoft kinect driver. Are you experiencing issues? I'm thinking the solution might involve rewriting some Compatibility Support Module (CSM) stuff in EFI so that it. less on the old Mac Pros. Apple Footer.
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