Q: is this a useful tool, early 2009 4,1: OWC Accelsior S
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Nov 3, 2015 12:50 PMby lllaass,You link returns a generic MacSales/OWC page with:
Sorry, but we could not find your requested item.
Yes, you can get PCle cards that accept 2 1/2" SSDs and that will use a SATA III (6 GB/s) drive at its full speed. You can get PCLe cards that will accept two 2 1/2 inch SSDs too.
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Nov 3, 2015 1:13 PMby Steve Zavodny,thank you
http://eshop.macsales.com/item/OWC/SSDACL6G.S/
so is this a significant upgrade for $58?
Am I buying increased read/write speed?
Maybe i dont have SATA III
I bought it a couple of years ago and
maybe there was not Sata III at that time?
Cant tell on the label.
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Nov 3, 2015 2:00 PMby Tom Nelson1,I reviewed the product from OWC, using it a 2010 Mac Pro and found it to be a solid product that I really liked.
Accelsior S Review: Give Your Mac Pro a Performance Boost
Highly recommended for those wanting to improve drive performance at a reasonable cost.
Tom
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Nov 3, 2015 2:17 PMby lllaass,What specific SATA II drive is it. Some, especially older ones ae not that fast.
Also, do you have TRIM enabled on the SSD?
Sometimes/some SSD need that to maintain speed otherwise they get filled up with deleted data. For oe info see:
http://www.buildcomputers.net/trim-support.html
How you enable TRIM on a Mac depends upon the OSX version.
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Nov 3, 2015 8:16 PMby Steve Zavodny,"How you enable TRIM on a Mac depends upon the OSX version."
10.10.5
here is what the manual says for macPro 4,1 early 2009:
You can install additional PCI Express graphics and expansion cards. Before installing a card, check its specifications to make sure it can operate in your Mac Pro:  Slots 1 and 2 are x16, PCI Express 2.0 slots  Slots 3 and 4 are x4, PCI Express 2.0 slots All four slots support 16-lane cards.
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Nov 3, 2015 8:22 PMby Steve Zavodny,OK how about this regarding OWC SSD's:
if you have an OWC SSD, though, you don’t need TRIM. The SandForce controller in our SSDs takes care of this “garbage collection” as well as performs various other tasks that keep your drive running at optimal speed, without the drop-off that you see with other brands. Especially note page two of this performance testing expert’s report where he feels so strongly about TRIM’s inefficiency that he calls call it “half-baked”…and that’s the kid friendly version of the phrase.
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Nov 4, 2015 1:30 AMby lllaass,There is a debate whether or not you need TRIM for the OWC SSDs
To enable TRIM on 10.10.4 and later:
Only the 2006-2007 Mac Pros have configurable PCle slots
Mac Pro (Early 2008 to Mid 2012): About the PCI Express slots - Apple Support
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Nov 4, 2015 8:55 AMby Steve Zavodny,from OWC:
"TRIM does not need to be enabled on our drives. They have built in processes that help to maintain them."
"Only the 2006-2007 Mac Pros have configurable PCle slots"
yes, configurable, but other iterations are factory configured
and compatible, as I read it, and as OWC sells it.
