well it depends on your cooling. Most people I know who have tried overclocking their 700 have hit over 1Ghz. They all have thesame cores and if i was you, i would get the 700 and good quality ram, cost the same as 750 and cheapo PC133 ram, and you should be able to hit the same thing as the 750 with the advantage of higher mem speed and agp/pci bus.