Yes just looking at it you can't tell. A 1.0 only runs at 1/2 the bandwidth as a 2.0 slot. And also, a 1.0 slot can only supply 50w of power to any given card, a 2.0 can supply 75w. See that 9800gt is meant for a 2.0 slot, it runs at about 60w I believe, so a 1.0 slot cannot handle it. BUT, each 6 pin connector can supply up to 75w of power also(in addition to the 50/75 from the x16 slot), so thats why I said you can run a card on a 1.0 slot as long as it has a 6 pin connector.