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1. Re: CS4 CPU usage at 66,66% magnification
ArrrBee Nov 3, 2008 8:18 AM (in response to klsteven-vBdprK)<Stefan_Klein@adobeforums.com> wrote in message <br />news:59b6ebcd.-1@webcrossing.la2eafNXanI...<br />> Whenever I look at a picture at 66,67% in CS4 (OpenGL on)my CPU works at <br />> about 60-70%! That`s on Vista32, Intel Q6600, Geforce 8600GT/512MB, 4G <br />> Ram, newest driver. That GPU stuff is really buggy, the forum`s full of <br />> it. Hope it will be updated soon, because I like that feature....as long <br />> as it works.<br /><br /><br /><br />GPU support isn't all that buggy. The problem is of all the drivers video <br />drivers seem to be the biggest piles of poo one has to deal with. For some <br />reason ATI and most others seem to have some real problem doing good, stable <br />bug free drivers for their video cards. This has nothing to do with Adobe. <br />If your video card maker did their job right and your video card supports <br />the needed features that GPU support will work fine in Photoshop. If you <br />look at the vast majority of complaints with GPU it all comes down to either <br />the wrong video card or more often poor drivers. For some reason the video <br />card makers get the hardware done pretty well but can't seem to make a <br />stable, reliable, all feature supporting video driver to save their lives.<br /><br />Robert -
2. Re: CS4 CPU usage at 66,66% magnification
klsteven-vBdprK Nov 3, 2008 9:10 AM (in response to klsteven-vBdprK)Robert,
it seems that Adobe is pointing at the graphics hardware makers while nvidia seems to point at Adobe (there were some forum messages about that):
http://www.adobeforums.com/webx/.59b6d78b/76 :
"NVIDIA Software Development is aware of this application performance problem and is working with Adobe to get the issue resolved in a Adobe point release.
Best Regards,
Troy
NVIDIA Customer Care"
Why do we need a "point-release", if it`s all about buggy drivers?
Okay, whatever....I`m just a user and can`t judge where the problem is.
Another question:
why is screen redraw with OpenGL OFF (!) so slow in CS4? I guess that can have nothing to do with drivers. In CS3 it`s so fast that I can hardly see it with the naked eye while in CS4 I can see the individual tiles as they get drawn. I takes about 0,5 sec (just guessing)for the screen to redraw while CS3 does it in nearly realtime.
The consequence is that everything that needs a screen redraw (for example turning layer visibility off or on, moving part of the image, brushing, typing etc.)is very slow in CS4. Turning on OpenGL doesn`t help here either, because the screen doesn`t seem to redraw faster then. It`s only faster as long as the image itself doesn`t change. So panning and zooming is fine (in most cases). But as soon as the content changes and tht screen redraws, everything gets slow (with Open GL ON or OFF). -
3. Re: CS4 CPU usage at 66,66% magnification
ArrrBee Nov 3, 2008 11:40 AM (in response to klsteven-vBdprK)I have no doubt that the companies are pointing at each other. My problem
with laying this at Adobe's feet is that the features required for GPU to
work in Photoshop is really nothing special. It just calling documented
technologies like OpenGL, Adobe isn't really creating anything new here,
they are just calling on features in OpenGL, etc. I find it hard to believe
that Adobe couldn't even get that much right. I find it much more likely
that it is the poor quality of the video card drivers causing issues than
anything Adobe has done. My reason for this feeling is that by and large
video card drivers and their overall poor quality even for expensive higher
end cards is very well documented in just about any user forum you can find
that does with anything video card related. Gamers have no end of problems
with video card drivers. We had a couple of reports of curors in Photoshop
CS4 not displaying right that were fixed with updated drivers. Screen redraw
issues fixed with updated drivers. Also, if drivers aren't such a problem
why are their so many driver updates released. If they did it right when the
product lauched and assuming a very generous allowing of 2 updates to fix
little things they missed then why are we seeing so many driver updates. The
hardware isn't changing, it can't magically starting doing things it wasn't
designed for, so the drivers once released a couple of little things fixed
with two update so be rock solid and done. But, that isn't what happens. The
fact that there are so many updates tells me a lot about the quality control
of the video card drivers.
Now this isn't to say that Adobe couldn't have an issue or two. But, I would
bet dollars to donuts that the vast majority of problems lies with the video
card drivers and not Adobe. Until the video card makers stop trying to pass
the blame they won't get fixed.
Robert -
4. Re: CS4 CPU usage at 66,66% magnification
klsteven-vBdprK Nov 3, 2008 1:40 PM (in response to klsteven-vBdprK)Robert, I agree with you on driver quality. But what about the slow screen redraw when OpenGL is OFF? Don`t you see the slow redraw compared to CS3 on your own system (as described in my previous post)? The speed of screen redraw in CS3 was never depending on a specific driver version. So I guess it doesn`t change with the driver in CS4 either (as I said: when OGL is OFF).
Stefan -
5. Re: CS4 CPU usage at 66,66% magnification
ArrrBee Nov 3, 2008 5:32 PM (in response to klsteven-vBdprK)<Stefan_Klein@adobeforums.com> wrote in message <br />news:59b6ebcd.3@webcrossing.la2eafNXanI...<br />> Robert, I agree with you on driver quality. But what about the slow screen <br />> redraw when OpenGL is OFF? Don`t you see the slow redraw compared to CS3 <br />> on your own system (as described in my previous post)? The speed of screen <br />> redraw in CS3 was never depending on a specific driver version. So I guess <br />> it doesn`t change with the driver in CS4 either (as I said: when OGL is <br />> OFF).<br />> Stefan<br />><br /><br />No I don't. For me that redraw is just as fast as CS3. I am running dual <br />PCI-Express ATI Radeon 1650 Pro cards with 512MB of ram each. No, not for <br />gamming but to handle three monitors.<br /><br />Robert -
6. Re: CS4 CPU usage at 66,66% magnification
Chris Cox Nov 4, 2008 4:48 PM (in response to klsteven-vBdprK)NVidia support knows about ONE minor problem in Photoshop and seems to think that is the answer to all of their performance issues. We are trying to solve the issue (so they get back to fixing bugs). -
7. Re: CS4 CPU usage at 66,66% magnification
klsteven-vBdprK Nov 5, 2008 3:48 AM (in response to klsteven-vBdprK)Chris, it`s good to hear something from the developers like you!
Please also look into the screen redraw with OpenGL OFF. Sometimes it`s much slower than CS3. Especially with large files and many layers.
One special question: I`m on Vista 32bit and have Aero turned on (2 monitors at 1024/1200). How much graphics RAM is Vista itself using then? And does Vista itself still need that video RAM when Photoshop is open or can Photoshop use all the video RAM?
I`m asking because I want to know wether I could benefit from more then 512MB video Ram (which I have right now) even if I don`t do 3D.
Thanks in advance!


