Yes, there's a difference. But I think AMD man was suggesting that because texture artifacts are common on video cards where the video memory has been pushed too far past its limit. Generally these are the two symptoms for computer that can actually boot using these high settings:
Core speed too high
-constant stalls for seconds at a time followed by periods of flawless function, repeating over and over again--similar to behavior witnessed when you have an IRQ conflict although not as severe
-complete freezeup requiring reboot
Memory clocked too high
-Windows desktop starts showing strange graphical errors
-Textures in games are missing, blacked out, or colored strangely
1° of separation between my monopoly and yours. That's business with .NET