Multi caméra Firewire - problème de bande passante ?

Bonjour,
Je me permets de dupliquer mon post écrit en franglais sur "Machine Vision".
J'utilise 2 caméras firewire XCD-SX90 en parallèle. J'ai dupliqué le VI exemple "Grab and Select Mode.vi".
Si j'utilise un VideoMode tel que "1280x960 8bits 7,5fps" (ou framerates inférieurs), cela fonctionne.
Si j'utilise le VideoMode "1280x960 8bits 15fps", le second appel à la fonction IMAQdx Configure Acquisition.vi plante :
"L'erreur -1074360296 s'est produite à : IMAQdx Configure Acquisition.vi
Raisons possibles :
NI-IMAQdx: (Hex 0xBFF69018) Insufficient transfer engine resources."
Un rapide calcul de débit donne :
Pour une image 1280x960 8bits : environ 8Mb
A 15 images par secondes : 8x15 = 120Mb/s
Avec 2 caméras : 120x2=240Mb/s
Je suis bien en dessous de la limite de mon bus (400Mb/s) ou de celle des caméras.
Je travaille sous Windows XP Service Pack 3, et j'ai débridé le bus Firewire avec le patch "Prosilica".
Quelqu'un aurait-il une piste sur l'origine de cette limite ?
Merci.

Voici quelques liens utiles vers des forums répondus traitant des camera Prosilica qui pourraient peut etre vous aider :
Prosilica GC650C GigE error 0xBFF69012 Attribute value is out of range
Prosilica GC750C GigE camera not acquiring images using NI software
Ce lien vous permettra de revoir la méthode d'acquisition via LabVIEW.
Par contre pour vos mises à jour de la caméra, n'y a t il rien sur le site de prosilica??
Cordialement,
Nicolas M.
National Instruments France
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Journées Techniques LabVIEW 2012 : du 27 septembre au 22 novembre
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