Eric Fiegehen
Forum Replies Created
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Hi Toby,
Actually, we’re both correct! Desktop 2 with 4x single-width PCIe 16-channel slots is currently limited to 40Gbps. Desktop 2 with 2x double-wide PCIe 16-channel slots supports 80Gbps.
Yes, Desktop 2 can support 2x GTX480/580 cards. However, if you want to support more than 2 cards (graphics, capture, or otherwise) at 80Gbps connectivity with the host machine, you will need the Desktop 4 or Rackmount 2 models.
Eric
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Just want to correct some misinformation in this thread. GPU-Xpander Desktop 4, Rackmount 2, and Rackmount 8 systems all comply with the industry-defined specs for PCIe Gen2 x16, and all of them support a full 80Gbps bandwidth connection between the GPU-Xpander and the host machine, be it PC or Mac Pro. In other words, no performance hit or latency issues using these specific Cubix products.
Alternatively, GPU-Xpander Desktop 2 with the dual double-wide slots (not 4x single-wide slots) does support a full 80Gbps connection
Eric Fiegehen
Director, Visualization & GPU Compute Solutions
Cubix Corporation
ericc@cubix.com
https://www.cubixgpu.com -
Alex – Maya 2012 uses CUDA for its Viewport 2.0 feature. Mental Images iray is integrated into 3ds Max 2012, and features multi-GPU support for physically-based rendering.
Eric
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Alex,
CUDA is used in Autodesk 3ds Max, Maya, and a few other Autodesk applications. Even though Maya doesn’t support iray the way 3ds Max does, it uses a CUDA driver for dedicated hardware acceleration, meaning a 2nd GPU is required for many processes. Seems like Smoke is going in this direction, but the number of GPU-accelerated processes is limited at this time, even with the new release.
Eric F
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Hi Sascha,
Yes, I would say there are a couple of different (supported) configurations which I think would work better. I keep hearing the Quadro FX 4800 is a little faster than the 4000, and of course the GTX 285 would be even faster than the Quadro FX 4800. I wish NVIDIA would come out with either a GTX for Mac or Quadro for Mac based on the latest architecture.
Have you tried multiple GTX 470 cards yet? Cubix would be as thrilled as anybody else in this forum if a high-performance Fermi-based card would be tested and approved for Resolve. If I had to guess what the best, readily available GPU-accelerated configuration would be (strictly in the context of acceleration), I would say a Quadro 4000 as GUI in MP Slot 1 + 3x Quadro FX 4800 cards in Xpander Desktop 4. Then, you’ve got room left in the Xpander for an ATTO card or RED Rocket.
Eric
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Hi David,
Maya 2012 does and (i think)anything Adobe with Mercury Engine will.
Eric F
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Sascha,
Were you testing with a 4-slot, GPU-Xpander Desktop 2 or a Desktop 4 system? The model of Xpander used could greatly affect your benchmark tests due to bandwidth support differences between the two models. Desktop 2 (current model) maxes out at 40Gbps at the host interface card, Desktop 4 supports 80Gbps at the HIC.
Eric Fiegehen
Cubix -
Keep in mind Slots 3 & 4 are PCIe x4 electrical only. Even if you get a 16-channel card like Quadro 4000 running in either of these slots, they won’t receive full PCIe x16 bandwidth. This would apply to RED Rocket (PCIe x8) or ATTO’s dual or quad channel HBAs (both have PCIe x8 connections to the backplane).
Eric
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Guys, please check with DaVinci when comparing various configurations, including comparisons between GPU-xpander Desktop 2 and Desktop 4 systems. There are data transfer speed differences between these two products which may affect performance when working with Resolve 8 in multi-GPU configurations.
Eric Fiegehen
Cubix -
Just to emphasize more of what Paul said, Cubix GPU-Xpander Desktop 4 was lab-tested running with 4x RED Rockets by one of the major industry vendors a few months ago. I found out at NAB that we ran the 4x Rocket configuration at a consistently cooler temp than anything else the vendor has tested.
Thanks for the Desktop 4 thumbs-up Paul!
Eric Fiegehen
Director, Visualization & GPU Compute Solutions
Cubix Corporation
ericc@cubix.com
https://www.cubixgpu.com