Menet közben leltem egy srácot aki pont ezzel a problémával kereste meg a Gigabyte-ot.Kb. azt válaszolták neki amit én is modntam.
Thank you for your kindly mail and inquiry. About the issue you mentioned, based on PCI-E 2.0 spec., PCI-E 2.0 VGA card should backward compatible with PCI-E 1.x spec. Thus, theoretically, the VGA card you mentioned should work on your motherboard without problem.
But if possible, we recommend you testing the VGA card with your motherboard before you buy it to avoid H/W compatible problem. And sometimes because high performance VGA cards requires additional power input, so please make sure that your power supply unit fits the power requirement.