I'm from China and would appreciate it if you could help me with this.
On a Windows XP x64 system with 4 x 1GB RAM installed, I'm able to install DeckLink drivers for Windows XP x64 (6.7.x~6.8.x), but unable to use the DeckLink Extreme PCI-X card, as it says there is a device conflict. After unplugging two 1GB RAM modules, the card works fine.
If I change the RAM from 4 x 1GB to 2 x 2GB, the same problem occurs.
Because the RAM modules must be installed in pair, I don't think it necessary to try 3 x 1GB.
When on a Windows XP 32bit system with 4 x 1GB RAM installed, the operating system can recognize 3GB and the card works fine.
My card is DeckLink Extreme PCI-X.
The motherboard is Tyan S2692.
QuickTime and DeckLink drivers are the latest versions.
Having read other posts on this forum I understand that this is a hardware limitation.
I decided to use dual boot to load windows 64 with the /maxmem switch and without. This allows me to use the card when I need and the full amount of ram when I don't. It also solves the problem of having to physically remove the ram and enables you to use 3gb which, as you point out isn't an option when modules need to be in pairs.