Video card Band wideth … need explaination

[Kevin Camp]

i’m not sure the graphics card would be responsible for the preview playout issue…

i think the problem may be more likely that the slot that the aja card is in is not fast enough for realtime playout. do you have a way to verify the slot speed and the requirements of the aja card?

it might be possible that the graphics card and the slot that the aja card are in are sharing the pci bus (is the 7300 a pci board or agp?), and that the 7300 is restricting the bandwidth. or that the aja card is having to share bandwidth with another high bandwidth device on its bus, like a disk array.

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW

[Reggie Spires]

Kevin

Thanks for the input .. I bought a Geforce 8800 GTS yesterday and that did not change anything.. How can I check to see if the sharing is taking place? Are you talking about IRQ’s? I have moved the AJA card to every slot with no difference.

I am using a PCI-x card in a PCI slot but that shouldn’t cause this problem.

The crazy thing is that it works fine in PPro and Machina.. Just AE ram reviews.

Thanks again … I have worked on it for 3 days non stop .. bout ready to wave the white flag

Reggie Spires
Magic City Group
Magic City Productions
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[Kevin Camp]

[Reggie Spires] “How can I check to see if the sharing is taking place?”

you’d probably need to check the manuals that came with the pc, or look up that model on the internet. you should be able to find out which slots are on the same bus (like sots 1 & 2 share one bus and 3 & 4 share another). the documentation may have recommendations on slot assignments for various common pci cards. since you’ve said you tried every slot, so i’m not sure how much help it will be… but many systems have mixed bus speeds, so some slots are faster than others.

the mac pros will allow you to configure the number of lanes each slot can utilize to some degree… so if you have 4 slots and 32 total lanes, you could split them all equally, 8 lanes each, or you could give some devices more lanes, like 16 to the graphics card, 8 to a sata card, and 4 to the other slots… you may be able to configure your pci bus too, but i’m not up-to-date on newer pcs.

Kevin Camp
Senior Designer
KCPQ, KMYQ & KRCW

[Reggie Spires]

Can’t find anything out … Oh well i surrender

Reggie Spires
Magic City Group
Magic City Productions
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