Normally all KT333 based mobo’s should have PCI 1/5. (ASUS A7V333; MSI KT3 Ultra…)
As a general rule:
Motherboards 100 MHz capable: 1/3
133 MHz capable: 1/4
166 MHz capable: 1/5
200 MHz capable: 1/6
<b>(<font color=yellow>as good as it looks</font color=yellow>)</b>