Graphics display issue/s.

Does it matter which slot of two my PCIExpress video card is installed to? It’s a 16X card installed to a 16X slot. There are two 16X slots. I’ve installed to the one furthest from the CPU, if that’s relevant.

I’m having some weird display issues.
‘Fluid’ scrolling. Very disconcerting.
‘Blinking’ display. Also very disconcerting.

Card is ASUS AX 300SE\T, installed to an ASUS A8N32-SLI Deluxe. OS is WinXP Pro, SP2. Monitor is Samsung 913v.