Because the cheaper one has problems see one of the customer opinions :
Pros: 100fps Saints Row 3 on Ultra, when it works
Cons: Crashes randomly, black screen
Other Thoughts: Whoever said that if you have an SKU higher than 11199-03 you shouldn't have issues is incorrect. I have an SKU of 11199-19 and the card has serious problems. Probably won't buy from Sapphire again.