I think I am getting something closer to 600MB/sec on my 3 stripe internal raid. Perhaps because I'm using 4TB drives that extra density speeds up the software raid. Of course it also depends on where it is on my raid stripe. First partition is significantly faster than fourth partition. I agree on the SSD PCI-x taking up a slot but it does also have two Esata connectors. After contacting MacVidcards I'm told the TitanX cards will only work with 10.10 OS. I'm waiting to hear back from Mike P. on the exact details of his expansion chassis system with two Titans. According to MacVidcards he must be running older Titan or Titan black and not the new Titan X cards that I have. I may just flash one for mac and bite the bullet to run 10.10 and see how well that works before jumping on the expansion chassis. That leaves me with an extra 680 and Titan X so hopefully I'll be able to find an expansion chassis suitable or second computer PC style.
I'm still trying to keep the GTX-680 in the main tower in case I need to boot to pre 10.10 startup drives.
---In avid-l2@yahoogroups.com, <Greg@...> wrote :
Note that you could LOOSE 4gig Atto cards (and maybe others?) if you go above OSx 10.9.5 as they didn't write a drive as the 4gig cards are eol. There is a way around that in 10.10 and 10.11. BMD states that 10.10.3 is required for Resolve 12.3.1.
We have one machine running dual GTX680 - though one of them is in a qubix box (originally needed the space for red rocket, which I no longer use, but also have both BMD and Nitris I/Os.) There's another bay running a single GTX680. The difference in Resolve render performance is significant, especially when using noise reduction. No noticeable difference in Media Composer. Rather than adding a second card, we use the 'spare' slot for a combo USB3/Esata card, as that bay often does double-duty as an assistant station.
I believe the Titans draw more power- probably double check on that with someone who knows for sure, especially if you're going to use TWO of them!
gh
----------------------------------------------------
Greg Huson
Chief
Secret Headquarters, Inc
Production / Post Production
Culver City, CA
323 677 2092
www.SecretHQ.com
www.DigitalServiceStation.com
> On Feb 24, 2016, at 3:46 PM, Dave Hogan mactvman@... [Avid-L2] <Avid-L2@yahoogroups.com> wrote:
>
>
> I am curious which PCIe SSD card you are using. (And curious what others are using in their MacPro Towers).
>
> The Mac Pro 2012 has only PCIe slots (2 x 16 lane and 2 x 4 lane), and they are v 2.0, so each lane can do 500MB/sec. Even in the 4 lane slots, you should be capable of 2GB/sec theoretical, depending on how well the cards drivers are written. However, if you are using this Mac Pro with AVID, don't you fill the last two slots with I/O to your appliance and Fiber channel card to Unity?
>
> Also, you aren't going to get the best out of the latest cards that are PCIe 3.0, due to the fact that MacPro is only PCIe 2.0.
>
> It's not as fast as as a PCIe SSD card, but what I have done with my Mac Pro tower (2010) is place two SSDs of the same size in the optical bays and set them up RAID0, as my startup drive. Even though those SATA connections are only 3 gigabit, I get an overall read/write speed of about 500 MB/sec, due to the Raid0. Then I still have the 4 drive bays for a fast local RAID with traditional spinning drives, and my PCIe slots available for other cards. Been thinking of putting in a 2nd graphics card in the other 16x PCIe slot for better render performance in Resolve. Any suggestions?
>
> Dave Hogan
> Burbank, CA
>
>
Posted by: bigfish@pacbell.net
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