CS4 GPU Accelleration and ATI X800

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my photoshop cs4 not allow me turn on gpu accelleration, checkbox greyed out. on vista 64 latest updates , or without ati catalyst. card ati x800 pcie. card has pretty 2d performance , believe has opengl 2 support, , don't see why not work. have similar experience or idea troubleshooting? far tried reinstalling drivers.

running latest driver? that's first advice you'll may not help. there couple of registry toggles can turn on/off gpu features. here's link.

http://kb.adobe.com/selfservice/viewcontent.do?externalid=kb406921

you'll find these registry toggles disscussed in forum threads if search.

with 256mb of ram on card, you'll limited in acceleration features you'll number of open files can run accelerated. see adobe tech note has details on troubleshooting may or may not you:

http://kb.adobe.com/selfservice/viewcontent.do?externalid=kb404898

here's list of cards adobe has tested (yours isn't on list):

http://kb.adobe.com/selfservice/viewcontent.do?externalid=kb405711

even if opengl running card, you'll want upgrade 1 more onboard memory. i'm still trying home in on cards offer price/performance photoshop cs4 acceleration.


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