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Member Since 26 May 2007
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In Topic: Nvidia Web Driver updates for Yosemite

24 April 2015 - 06:45 AM

With latest Nvidia Web driver i get often Channel Timeouts (shown in console, NVidia GT 440) , system freezes in that case or only mouse can be moved for a while without any other interaction with the system.

23.04.15 12:37:47,000 kernel[0]: NVDA(DMA): Channel timeout!

23.04.15 12:37:47,000 kernel[0]: NVDA: Version Info: [com.nvidia.web.GeForceWeb, 10.0.3, 0x746c6943485b52176d5f58, 19437306, 346.01.02f02, 1]
With Apple drivers i get (sometimes) Channel exception!, which didnt freeze the system.
23.04.15 21:29:40,000 kernel[0]: NVDA(OpenGL): Channel exception! Exception type = 0x20 DMA Engine Error (PBDMA Error)
23.04.15 21:29:40,000 kernel[0]: NVDA: Version Info: [com.apple.GeForce, 10.0.2, 0x746c6943485b52795b4a534e5b54, 19375532, 310.41.25f01, 1]

In Topic: AMD Radeon R7 250 HDMI working in Mavericks

23 April 2015 - 08:33 AM

Which R7 250 card works with DVI out of the box (no framebuffer patching, or blackscreen prob = must sleep/wake up) running chameleon + Yosemite?

I had an nigthmare with my first AMD 6xxx card - no DVI output and switched back to nvidia which works really out of the box (but have preview problems)

In Topic: which nvideo cheap video card to use, in Yosemite 10.10.3 ?

21 April 2015 - 03:43 PM

Whats about newer,also cheap maxwell GTX 720/30 Gpus which use very low power?

I am happy with Fermi GT 440 , only major prob is preview not working (pic gets corrupt).

Any cheap (used)  kepler card recommended which works with preview yosimite? 

GT 210/220/230 are very slow! Also MSI 8400.

In Topic: Released final version OS X Yosemite 10.10.3

13 April 2015 - 08:33 AM

All works good on my system.

BESIDE the new Photos app :(

Complete system Freezes after some time ( using  the edit functions in the Photos app for a while)!

As i look in the console (after reboot) i can see the "Nvidia Channeltime out" is back !

In the past sometime this bad things happens with some GPUs (remember some 10.8/10.9 versions) but for me first happening in 10.x.


Mon Apr 13 00:56:48 2015

Event:               GPU Reset
Data/Time:           Mon Apr 13 00:56:48 2015
OS Version:          Mac OS X Version 10.10.3 (Build 14D131)
Graphics Hardware:   Asus GeForce GT 440
Signature:           0
Report Data:
NVDA(OpenGL): Channel timeout!
Channel Info: [19, 0xe, 0xe, 0x220]
Version Info: [com.nvidia.web.GeForceWeb, 10.0.3, 0x746c6943485b52176d5f58, 19437306, 346.01.02f01, 1]
Internal Version Info: [1, Release, Private build]
Execution Info: [0xffffff800092a4e0, 0xffffff8000929a70]
I will try using Apple NV drivers but i have less hope that this will fix the problem (As Preview App also , since 10.x has some probs, but others not the freezing prob)

In Topic: OpenCL Oceanwave Bench and (new) CompuBench CL

08 April 2015 - 09:40 AM

You are not rigth, that the CompuBench CL is Nvidia optimized. Look for each test results and you find some test were AMD is faster than Nvidia!

Example the TV-L1 Bench: AMD 290 is much faster than Nvidia Titan there:  30 vs 20 in the result list. (Tab results in Compubench, TV-L1)

So i think , the bigger OpenCL test set of Compubench is serious because it runs not only one task and so shows results of more different gpu compute tasks than Luxmark.

Luxmark is good and serious but head dev has only AMD gpu to dev and test. Overall newer AMD have advantages over Nvdia (more by its better gpu compute hw design than drivers),but not in all OpenCL code conditions. Some conditions are better for AMDs advantages, like TV-L1 Bench others show not its adantages or even run faster on the Nvidia gpu hw design.


So its good to have    more than one OpenCL bench. If you compare all results its more real life than only one.


By the way, ist also interesting , in Compubench CL to see the diff between CPU and GPU tests. 

Last but not least: In all OpenCL benches, luxmark &.... , the CPU speed (GHz, cores, L1, L2 Cache size,..) does matter also for GPU OpenCL speed!

The faster the GPU the more the cpu speed does matter.

Because of the overhead transfering data + results to/from gpu to the cpu and OpenCL driver overhead.

Like OpenGL cpu+driver overhead heads into OpenGL speed diffs  for same GPU but different CPUs.

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