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Re: [OM] The GPU - was More Memory (OT)

Subject: Re: [OM] The GPU - was More Memory (OT)
From: "C.H.Ling" <ch_photo@xxxxxxxxxxxxx>
Date: Mon, 27 Sep 2010 19:38:35 +0800
Thanks for the link, I have no experience with Aperture but for CS4 I think 
the GPU only enable smooth zooming and faster move/rotate the image around, 
this may be good for 3D but for 2D image editing I don't find enabling the 
"Open GL" do any improvement to my editing, disabling the "Open GL" make the 
editing MUCH faster, zoom and move the image around is instant but smooth 
view only limited to 25%, 50%, 100%, 200%... and I don't found this any 
problem. I don't have a very fast card but my HD4670 with 512MB RAM do works 
well under "Open GL" but I still prefer to turn it off.

C.H.Ling

----- Original Message ----- 
From: "SwissPace" <ian@xxxxxxxxxxxxxxxx>

  "Times they are a'changing", the GPU is much more capable nowadays and
can do a lot more, more and more computational work is being handed over
to it, this will only increase with time hence my recommendation I am
not sue how much photoshop hands over to the GPU but see this comment


So what does GPU acceleration actually mean for Photoshop CS4? Quite a
lot, actually. For a start, everything works faster, and this is
especially noticeable when you’re panning or zooming your way around
large images. The Zoom tool is instantaneous, with no lagging, and
completely smooth no matter how close you get. When you get to 500 per
cent, you can get right down to a pixel-by-pixel view with no bleeding
between the pixels – this pixel grid is perfect for extremely precise
editing.

full article here
<http://www.photoshopdaily.co.uk/featured/gpu-acceleration-in-photoshop-cs4/>

and also for aperture
Aperture Performance: ATI Radeon HD 4870 vs ATI Radeon HD 5870
<http://store.apple.com/us/question/answers/product/MC743ZM/A?mco=MTQzMzA4NzQ&pqid=QJPJFXKDYKA4HUTK4T2XYP2UD97J2K9YC>



I have an early 2009 Mac Pro with the ATI Radeon HD 4870 graphics card.

Do you think there will be a significant performance boost using the
5870 over the 4870 with Aperture ? Apple says the 5870 is great for
"motion graphics, 3D modeling, rendering, or animation", but not sure if
I should expect much improvement using it with Aperture. I am pretty
happy with the 4870, so don't want to spend the cash for minimal
improvement.

Any thoughts or speculation?


          Answer

Currently, Aperture 3 ONLY uses the GPU when applying, and rendering
adjustments. Everything else is CPU bound.

If you are having slow response with sliders, or brushing on
adjustments, the card may be worth upgrading.

The biggest change would be that the 5870 has 2x the amount of VRAM and
aperture can start to run slow If you've brushed on a lot of layers, and
there isn't enough VRAM to hold all the layers in the video card's
memory - Another factor here is if you have 2 displays at high
resolution - You will need more VRAM.

There's really no scientific way to test this, but I've found that you
need at least 256MB of vram per display for aperture 3 to work well with
21MP raw files.

snipped from this page
<http://store.apple.com/us/questions/product/MC743ZM/A?mco=MTg3MjE2MDA>


with mine I noticed minimal performance improvement from going over 4Gb
ram, it did improve a bit but the main benefit for me was because I need
to run two virtual machines on it for work and it helps there. I did
notice an improvment when using aperture with my 8800GT and also the
3870HD. If I had spare cash I would stump up for the 4870 but the
landrover is taking all that at the moment ;-)



> For the display card, as far as I know it pay no part in speed up the
> editing function. It only affect the zoom and scroll of image IF you 
> enable
> the OpenGL Drawing function.

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