I just swapped out my 7800GT for a Gigabyte GV-NX78T256V-B 7800GT. Why is my core default at 275Mhz? in Vtuner2 and Riva tuner? I thought it should be around 400? I may be being dumb lol. The memory is 1000Mhz which is right. If I hit smart tune in Vtuner2, the core goes up to 405 Mhz.