Well, I was already aware of what most HD6850s were capable of through overclocking, and I found that I hit a similar wall with this one. The core speed, while using a voltage of 1.225V, got stuck at 1030MHz. Everything after that began to artifact and show poor, unstable image quality. At 1030MHz, this card produced the highest core clock speed of all of the comparison cards! This is a slight improvement over the XFX HD6850 comparison card, which maxed out at 1020MHz. The memory, on the other hand, pulled ahead at 1249MHz where the comparison HD6850 stopped at about 1200MHz. With a cooler that is slightly improved over the reference, XFX version, this isn't to be unexpected. The results here are good, especially with the near 30% overclock on the core.