Of course, I wouldn’t stop at CL3. I went further by setting the timings
to 4-4-4-X. This pair of memory scales pretty well with CL4 and I managed to
achieve 500MHz at CL4-4-4-8 with just 2.1v.

9 TwinMOS Twister X   2 x 512MB PC2 6800

501MHz @ CL4-4-4-8, 2.1v

Without holding back, I increased the voltage fed to the Memory. I managed
to overclock this Memory to 550MHz with 2.45v:

10 TwinMOS Twister X   2 x 512MB PC2 6800

520MHz @ CL4-4-4-8, 2.25v

11 TwinMOS Twister X   2 x 512MB PC2 6800

531MHz @ CL4-4-4-8, 2.3v

12 TwinMOS Twister X   2 x 512MB PC2 6800

540MHz @ CL4-4-4-8, 2.35v

13 TwinMOS Twister X   2 x 512MB PC2 6800

550MHz @ CL4-4-4-8, 2.45v