Early 7900 GTX stability issues explained
In addition to $500+ price tags and availability problems
GeForce 7900 GTX graphics cards, some early adopters have also had
intermittent system freezes. PC Perspective has traced those
to some factory-overclocked cards, which NVIDIA says didn't
have the necessary headroom for increased clock rates. The issues were
present on cards clocked as low as 20MHz above stock speeds. PC Perspective
blames the high vertex clock—which is always 50MHz above the core
clock—and increased memory speeds as the main culprits.
Thankfully, NVIDIA says the misbehaving cards will be replaced by their
respective manufacturers, and that newer cards should have no problems
running overclocked. 7900 GTX users suffering from those problems are
therefore advised to get into contact with their card manufacturers and
attempt to get their cards replaced.